| Southwestern Ontario Area Code 548 Telephone Exchanges / Prefixes |
|---|
| Major Cities/Towns: London - Kitchener-Waterloo - Brantford - Mount Forest - Guelph |
|---|
| Prefix | Company | Status | Location |
|---|
| 211 | | For Special Use | |
| 226 | | Not Available | |
| 279 | | Available | |
| 280 | | Available | |
| 281 | | Available | |
| 283 | | Available | |
| 284 | | Available | |
| 286 | | Available | |
| 287 | | Available | |
| 289 | | Available | |
| 290 | | Available | |
| 291 | | Available | |
| 292 | | Available | |
| 293 | | Available | |
| 294 | | Available | |
| 295 | | Available | |
| 296 | | Available | |
| 297 | | Available | |
| 298 | | Available | |
| 301 | | Available | |
| 302 | | Available | |
| 303 | | Available | |
| 304 | | Available | |
| 305 | | Available | |
| 306 | | Available | |
| 307 | | Available | |
| 308 | | Available | |
| 309 | | Available | |
| 310 | | Moratorium on Assignment | |
| 311 | | For Special Use | |
| 312 | | Available | |
| 313 | | Available | |
| 314 | | Available | |
| 315 | | Available | |
| 316 | | Available | |
| 317 | | Available | |
| 318 | | Available | |
| 319 | | Available | |
| 320 | | Available | |
| 321 | | Available | |
| 323 | | Available | |
| 324 | | Available | |
| 325 | | Available | |
| 326 | | Available | |
| 327 | | Available | |
| 329 | | Available | |
| 332 | | Available | |
| 334 | | Available | |
| 350 | | Available | |
| 351 | | Available | |
| 352 | | Available | |
| 353 | | Available | |
| 354 | | Available | |
| 370 | | Available | |
| 371 | | Available | |
| 372 | | Available | |
| 373 | | Available | |
| 374 | | Available | |
| 375 | | Available | |
| 376 | | Available | |
| 377 | | Available | |
| 378 | | Available | |
| 379 | | Available | |
| 380 | | Available | |
| 381 | | Available | |
| 382 | | Not Available | |
| 384 | | Available | |
| 385 | | Available | |
| 386 | | Available | |
| 387 | | Available | |
| 389 | | Available | |
| 390 | | Available | |
| 391 | | Available | |
| 392 | | Available | |
| 393 | | Available | |
| 394 | | Available | |
| 395 | | Available | |
| 396 | | Available | |
| 397 | | Available | |
| 398 | | Available | |
| 401 | | Available | |
| 402 | | Available | |
| 403 | | Available | |
| 404 | | Available | |
| 405 | | Available | |
| 406 | | Available | |
| 407 | | Available | |
| 410 | | Available | |
| 411 | | For Special Use | |
| 412 | | Available | |
| 413 | | Available | |
| 414 | | Available | |
| 415 | | Available | |
| 416 | | Available | |
| 417 | | Available | |
| 418 | | Available | |
| 419 | | Available | |
| 420 | | Available | |
| 421 | | Available | |
| 422 | | Available | |
| 423 | | Available | |
| 424 | | Available | |
| 425 | | Available | |
| 426 | | Available | |
| 427 | | Available | |
| 428 | | Available | |
| 429 | | Available | |
| 430 | | Available | |
| 431 | | Available | |
| 432 | | Available | |
| 433 | | Available | |
| 434 | | Available | |
| 435 | | Available | |
| 436 | | Available | |
| 437 | | Available | |
| 438 | | Available | |
| 439 | | Available | |
| 440 | | Available | |
| 441 | | Available | |
| 442 | | Available | |
| 443 | | Available | |
| 445 | | Available | |
| 446 | | Available | |
| 447 | | Available | |
| 449 | | Available | |
| 450 | | Available | |
| 451 | | Available | |
| 452 | | Available | |
| 453 | | Available | |
| 454 | | Available | |
| 455 | | Available | |
| 456 | | Available | |
| 458 | | Available | |
| 459 | | Available | |
| 460 | | Not Available | |
| 461 | | Available | |
| 462 | | Available | |
| 463 | | Available | |
| 464 | | Available | |
| 465 | | Available | |
| 466 | | Available | |
| 467 | | Available | |
| 468 | | Available | |
| 469 | | Available | |
| 470 | | Available | |
| 471 | | Available | |
| 472 | | Available | |
| 473 | | Available | |
| 474 | | Available | |
| 475 | | Available | |
| 476 | | Available | |
| 477 | | Available | |
| 478 | | Available | |
| 479 | | Available | |
| 487 | | Not Available | |
| 491 | | Available | |
| 492 | | Available | |
| 493 | | Available | |
| 494 | | Available | |
| 495 | | Available | |
| 496 | | Available | |
| 497 | | Available | |
| 498 | | Available | |
| 501 | | Available | |
| 502 | | Available | |
| 503 | | Available | |
| 504 | | Available | |
| 505 | | Available | |
| 506 | | Available | |
| 507 | | Available | |
| 508 | | Available | |
| 509 | | Available | |
| 510 | | Available | |
| 511 | | For Special Use | |
| 512 | | Available | |
| 513 | | Available | |
| 514 | | Available | |
| 515 | | Available | |
| 516 | | Available | |
| 517 | | Available | |
| 518 | | Available | |
| 519 | | Not Available | |
| 520 | | Available | |
| 521 | | Available | |
| 523 | | Available | |
| 524 | | Available | |
| 525 | | Available | |
| 526 | | Available | |
| 527 | | Available | |
| 528 | | Available | |
| 529 | | Available | |
| 530 | | Available | |
| 548 | | Not Available | |
| 554 | | Available | |
| 555 | | For Special Use | |
| 557 | | Available | |
| 576 | | Available | |
| 577 | | Available | |
| 578 | | Available | |
| 579 | | Available | |
| 580 | | Available | |
| 581 | | Available | |
| 582 | | Available | |
| 583 | | Available | |
| 584 | | Available | |
| 586 | | Available | |
| 587 | | Available | |
| 589 | | Available | |
| 590 | | Available | |
| 591 | | Available | |
| 592 | | Available | |
| 593 | | Available | |
| 594 | | Available | |
| 595 | | Available | |
| 596 | | Available | |
| 597 | | Available | |
| 598 | | Available | |
| 601 | | Available | |
| 602 | | Available | |
| 603 | | Available | |
| 604 | | Available | |
| 605 | | Available | |
| 606 | | Available | |
| 607 | | Available | |
| 608 | | Available | |
| 609 | | Available | |
| 610 | | Moratorium on Assignment | |
| 611 | | For Special Use | |
| 612 | | Available | |
| 613 | | Available | |
| 614 | | Available | |
| 615 | | Available | |
| 616 | | Available | |
| 617 | | Available | |
| 618 | | Available | |
| 619 | | Available | |
| 620 | | Available | |
| 621 | | Available | |
| 623 | | Available | |
| 624 | | Available | |
| 625 | | Available | |
| 626 | | Available | |
| 627 | | Available | |
| 628 | | Available | |
| 629 | | Available | |
| 630 | | Available | |
| 631 | | Available | |
| 632 | | Available | |
| 634 | | Available | |
| 635 | | Available | |
| 636 | | Available | |
| 637 | | Available | |
| 638 | | Available | |
| 639 | | Available | |
| 640 | | Available | |
| 641 | | Available | |
| 642 | | Available | |
| 643 | | Available | |
| 644 | | Available | |
| 645 | | Available | |
| 646 | | Available | |
| 647 | | Available | |
| 648 | | Available | |
| 649 | | Available | |
| 650 | | Available | |
| 651 | | Available | |
| 652 | | Available | |
| 653 | | Available | |
| 654 | | Available | |
| 655 | | Available | |
| 656 | | Available | |
| 657 | | Available | |
| 658 | | Available | |
| 660 | | Available | |
| 661 | | Available | |
| 662 | | Available | |
| 663 | | Available | |
| 664 | | Available | |
| 665 | | Available | |
| 667 | | Available | |
| 669 | | Available | |
| 670 | | Available | |
| 671 | | Available | |
| 672 | | Available | |
| 673 | | Available | |
| 674 | | Available | |
| 675 | | Available | |
| 676 | | Available | |
| 677 | | Available | |
| 678 | | Available | |
| 679 | | Available | |
| 680 | | Available | |
| 681 | | Available | |
| 682 | | Available | |
| 683 | | Available | |
| 684 | | Available | |
| 685 | | Available | |
| 687 | | Available | |
| 691 | | Available | |
| 692 | | Available | |
| 693 | | Available | |
| 694 | | Available | |
| 695 | | Available | |
| 696 | | Available | |
| 697 | | Available | |
| 698 | | Available | |
| 701 | | Available | |
| 702 | | Available | |
| 703 | | Available | |
| 704 | | Available | |
| 705 | | Available | |
| 706 | | Available | |
| 707 | | Available | |
| 708 | | Available | |
| 709 | | Available | |
| 710 | | Available | |
| 711 | | For Special Use | |
| 712 | | Available | |
| 713 | | Available | |
| 714 | | Available | |
| 715 | | Available | |
| 716 | | Available | |
| 717 | | Available | |
| 718 | | Available | |
| 719 | | Available | |
| 720 | | Available | |
| 721 | | Available | |
| 723 | | Available | |
| 724 | | Available | |
| 725 | | Available | |
| 726 | | Available | |
| 727 | | Available | |
| 728 | | Available | |
| 729 | | Available | |
| 730 | | Available | |
| 731 | | Available | |
| 732 | | Available | |
| 734 | | Available | |
| 735 | | Available | |
| 736 | | Available | |
| 737 | | Available | |
| 738 | | Available | |
| 739 | | Available | |
| 740 | | Available | |
| 741 | | Available | |
| 742 | | Available | |
| 743 | | Available | |
| 744 | | Available | |
| 745 | | Available | |
| 746 | | Available | |
| 747 | | Available | |
| 748 | | Available | |
| 749 | | Available | |
| 750 | | Available | |
| 751 | | Available | |
| 752 | | Available | |
| 753 | | Available | |
| 754 | | Available | |
| 755 | | Available | |
| 756 | | Available | |
| 757 | | Available | |
| 758 | | Available | |
| 759 | | Available | |
| 760 | | Available | |
| 761 | | Available | |
| 762 | | Available | |
| 763 | | Available | |
| 764 | | Available | |
| 765 | | Available | |
| 766 | | Available | |
| 767 | | Available | |
| 768 | | Available | |
| 769 | | Available | |
| 789 | | Available | |
| 790 | | Available | |
| 791 | | Available | |
| 792 | | Available | |
| 793 | | Available | |
| 794 | | Available | |
| 795 | | Available | |
| 796 | | Available | |
| 797 | | Available | |
| 798 | | Available | |
| 801 | | Available | |
| 802 | | Available | |
| 803 | | Available | |
| 804 | | Available | |
| 805 | | Available | |
| 806 | | Available | |
| 807 | | Available | |
| 809 | | Available | |
| 810 | | Moratorium on Assignment | |
| 811 | | For Special Use | |
| 812 | | Available | |
| 813 | | Available | |
| 814 | | Available | |
| 815 | | Available | |
| 816 | | Available | |
| 817 | | Available | |
| 818 | | Available | |
| 819 | | Available | |
| 820 | | Available | |
| 821 | | Available | |
| 823 | | Available | |
| 824 | | Available | |
| 827 | | Available | |
| 828 | | Available | |
| 829 | | Available | |
| 830 | | Available | |
| 831 | | Available | |
| 832 | | Available | |
| 837 | | Available | |
| 838 | | Available | |
| 839 | | Available | |
| 840 | | Available | |
| 841 | | Available | |
| 842 | | Available | |
| 844 | | Available | |
| 846 | | Available | |
| 847 | | Available | |
| 848 | | Available | |
| 849 | | Available | |
| 850 | | Available | |
| 851 | | Available | |
| 852 | | Available | |
| 853 | | Available | |
| 854 | | Available | |
| 856 | | Available | |
| 860 | | Available | |
| 861 | | Available | |
| 862 | | Available | |
| 863 | | Available | |
| 864 | | Available | |
| 865 | | Available | |
| 873 | | Available | |
| 874 | | Available | |
| 890 | | Available | |
| 891 | | Available | |
| 894 | | Available | |
| 895 | | Available | |
| 896 | | Available | |
| 897 | | Available | |
| 901 | | Available | |
| 902 | | Available | |
| 903 | | Available | |
| 904 | | Available | |
| 905 | | Available | |
| 906 | | Available | |
| 907 | | Available | |
| 908 | | Available | |
| 909 | | Available | |
| 910 | | Available | |
| 911 | | For Special Use | |
| 912 | | Available | |
| 913 | | Available | |
| 914 | | Available | |
| 915 | | Available | |
| 916 | | Available | |
| 917 | | Available | |
| 918 | | Available | |
| 919 | | Available | |
| 920 | | Available | |
| 921 | | Available | |
| 922 | | Available | |
| 923 | | Available | |
| 924 | | Available | |
| 925 | | Available | |
| 926 | | Available | |
| 927 | | Available | |
| 928 | | Available | |
| 929 | | Available | |
| 930 | | Available | |
| 931 | | Available | |
| 932 | | Available | |
| 933 | | Available | |
| 934 | | Available | |
| 935 | | Available | |
| 936 | | Available | |
| 937 | | Available | |
| 938 | | Available | |
| 939 | | Available | |
| 940 | | Available | |
| 941 | | Available | |
| 942 | | Available | |
| 943 | | Available | |
| 944 | | Available | |
| 945 | | Available | |
| 946 | | Available | |
| 947 | | Available | |
| 948 | | Available | |
| 949 | | Available | |
| 950 | | For Special Use | |
| 951 | | Available | |
| 952 | | Available | |
| 953 | | Available | |
| 954 | | Available | |
| 955 | | Available | |
| 956 | | Available | |
| 957 | | Available | |
| 958 | | Plant Test | |
| 959 | | Plant Test | |
| 960 | | Available | |
| 961 | | Available | |
| 962 | | Available | |
| 963 | | Available | |
| 964 | | Available | |
| 965 | | Available | |
| 966 | | Available | |
| 967 | | Available | |
| 968 | | Available | |
| 969 | | Available | |
| 970 | | Available | |
| 971 | | Available | |
| 972 | | Available | |
| 973 | | Available | |
| 974 | | Available | |
| 975 | | Available | |
| 976 | | For Special Use | |
| 977 | | Available | |
| 978 | | Available | |
| 979 | | Available | |
| 981 | | Available | |
| 982 | | Available | |
| 983 | | Available | |
| 984 | | Available | |
| 985 | | Available | |
| 986 | | Available | |
| 987 | | Available | |
| 825 | ISP Telecom | In Service | Acton |
| 234 | Fibernetics Corporation | In Service | Ailsa Craig |
| 444 | IXICA Communications Inc. | In Service | Amherstburg |
| 561 | Fibernetics Corporation | In Service | Amherstburg |
| 775 | Distributel | In Service | Amherstburg |
| 268 | Fibernetics Corporation | In Service | Arthur |
| 540 | Fibernetics Corporation | Assigned | Atwood |
| 569 | Fibernetics Corporation | In Service | Auburn |
| 822 | Rogers Communications Canada Inc. | In Service | Ayr |
| 867 | ISP Telecom | In Service | Ayr |
| 869 | ISP Telecom | In Service | Baden |
| 200 | IXICA Communications Inc. | In Service | Belle River |
| 249 | Fibernetics Corporation | In Service | Belle River |
| 779 | Distributel | In Service | Belle River |
| 239 | Fibernetics Corporation | In Service | Belmont |
| 892 | ISP Telecom | In Service | Blenheim |
| 570 | Fibernetics Corporation | In Service | Blyth |
| 224 | TELUS Integrated Communications | In Service | Bothwell |
| 210 | Bell Canada | In Service | Brantford |
| 328 | Bell Mobility | In Service | Brantford |
| 338 | Rogers Communications Canada Inc. | In Service | Brantford |
| 800 | Iristel Inc. | In Service | Brantford |
| 880 | Rogers Communications Canada Inc. (Cable) | In Service | Brantford |
| 882 | Rogers Communications Canada Inc. (Wireless) | In Service | Brantford |
| 885 | Rogers Communications Canada Inc. (Wireless) | In Service | Brantford |
| 900 | Iristel Inc. | In Service | Brantford |
| 999 | TELUS Mobility | In Service | Brantford |
| 833 | Rogers Communications Canada Inc. | In Service | Breslau |
| 868 | ISP Telecom | In Service | Breslau |
| 834 | TELUS Integrated Communications | Assigned | Brigden |
| 232 | ISP Telecom | In Service | Brights Grove |
| 571 | Fibernetics Corporation | In Service | Brussels |
| 225 | TELUS Integrated Communications | In Service | Burford |
| 879 | ISP Telecom | In Service | Caledon |
| 356 | Fibernetics Corporation | Assigned | Cargill |
| 235 | Fibernetics Corporation | In Service | Centralia |
| 201 | Bell Canada | In Service | Chatham |
| 886 | Rogers Communications Canada Inc. (Wireless) | In Service | Chatham |
| 996 | TELUS Mobility | In Service | Chatham |
| 357 | Fibernetics Corporation | Assigned | Chatsworth |
| 358 | Fibernetics Corporation | Assigned | Chesley |
| 202 | Bell Canada | In Service | Clinton |
| 457 | Iristel Inc. | Assigned | Clinton |
| 257 | Fibernetics Corporation | In Service | Comber |
| 299 | IXICA Communications Inc. | In Service | Comber |
| 783 | Distributel | In Service | Comber |
| 250 | ISP Telecom | In Service | Corunna |
| 236 | Fibernetics Corporation | In Service | Crediton |
| 659 | ISP Telecom | In Service | Crediton |
| 273 | Fibernetics Corporation | Assigned | Delhi |
| 243 | Fibernetics Corporation | In Service | Dorchester |
| 322 | Rogers Communications Canada Inc. (Cable) | In Service | Drumbo |
| 541 | Fibernetics Corporation | Assigned | Dublin |
| 269 | Fibernetics Corporation | In Service | Dundalk |
| 254 | Wightman Communications Ltd. | Assigned | Durham |
| 532 | Fibernetics Corporation | In Service | Dutton |
| 227 | TELUS Integrated Communications | In Service | Elmira |
| 872 | ISP Telecom | In Service | Elmira |
| 522 | Rogers Communications Canada Inc. (Cable) | In Service | Elora |
| 252 | ISP Telecom | In Service | Emeryville |
| 260 | Fibernetics Corporation | In Service | Emeryville |
| 399 | IXICA Communications Inc. | In Service | Emeryville |
| 780 | Distributel | In Service | Emeryville |
| 400 | IXICA Communications Inc. | In Service | Essex |
| 562 | Fibernetics Corporation | In Service | Essex |
| 772 | Distributel | In Service | Essex |
| 858 | ISP Telecom | In Service | Exeter |
| 359 | Fibernetics Corporation | Assigned | Feversham |
| 531 | Fibernetics Corporation | In Service | Fingal |
| 360 | Fibernetics Corporation | Assigned | Flesherton |
| 218 | Bell Canada | In Service | Galt |
| 558 | Rogers Communications Canada Inc. | In Service | Galt |
| 566 | Fibernetics Corporation | In Service | Glencoe |
| 248 | Fibernetics Corporation | In Service | Goderich |
| 409 | Iristel Inc. | Assigned | Goderich |
| 980 | Rogers Communications Canada Inc. (Cable) | In Service | Goderich |
| 270 | Fibernetics Corporation | In Service | Grand Valley |
| 622 | Rogers Communications Canada Inc. (Cable) | In Service | Grand Valley |
| 209 | Bell Canada | In Service | Guelph |
| 408 | IXICA Communications Inc. | In Service | Guelph |
| 808 | IXICA Communications Inc. | In Service | Guelph |
| 855 | Rogers Communications Canada Inc. | In Service | Guelph |
| 988 | Rogers Communications Canada Inc. (Cable) | In Service | Guelph |
| 989 | TELUS Mobility | In Service | Guelph |
| 361 | Fibernetics Corporation | Assigned | Hanover |
| 244 | Fibernetics Corporation | In Service | Harrietsville |
| 220 | TELUS Integrated Communications | In Service | Harriston |
| 542 | Fibernetics Corporation | Assigned | Harriston |
| 262 | Fibernetics Corporation | In Service | Harrow |
| 600 | IXICA Communications Inc. | In Service | Harrow |
| 773 | Distributel | In Service | Harrow |
| 572 | Fibernetics Corporation | In Service | Hensall |
| 362 | Fibernetics Corporation | Assigned | Hepworth |
| 668 | Rogers Communications Canada Inc. | In Service | Hespeler |
| 271 | Fibernetics Corporation | In Service | Holstein |
| 246 | Fibernetics Corporation | In Service | Ilderton |
| 330 | Rogers Communications Canada Inc. (Cable) | In Service | Ilderton |
| 274 | Fibernetics Corporation | Assigned | Jarvis |
| 247 | Fibernetics Corporation | In Service | Kerwood |
| 500 | IXICA Communications Inc. | In Service | Kingsville |
| 563 | Fibernetics Corporation | In Service | Kingsville |
| 778 | Distributel | In Service | Kingsville |
| 857 | ISP Telecom | In Service | Kingsville |
| 212 | Bell Canada | In Service | Kitchener-Waterloo |
| 219 | Bell Canada | In Service | Kitchener-Waterloo |
| 255 | Rogers Communications Canada Inc. (Wireless) | In Service | Kitchener-Waterloo |
| 288 | Rogers Communications Canada Inc. (Cable) | In Service | Kitchener-Waterloo |
| 333 | Fido Solutions Inc. | In Service | Kitchener-Waterloo |
| 480 | Iristel Inc. | In Service | Kitchener-Waterloo |
| 481 | Iristel Inc. | In Service | Kitchener-Waterloo |
| 483 | Iristel Inc. | In Service | Kitchener-Waterloo |
| 484 | Iristel Inc. | In Service | Kitchener-Waterloo |
| 490 | Iristel Inc. | In Service | Kitchener-Waterloo |
| 883 | Rogers Communications Canada Inc. (Wireless) | In Service | Kitchener-Waterloo |
| 889 | Rogers Communications Canada Inc. | In Service | Kitchener-Waterloo |
| 898 | TELUS Integrated Communications | In Service | Kitchener-Waterloo |
| 990 | TELUS Mobility | In Service | Kitchener-Waterloo |
| 994 | TELUS Mobility | In Service | Kitchener-Waterloo |
| 253 | ISP Telecom | In Service | La Salle |
| 263 | Fibernetics Corporation | In Service | La Salle |
| 777 | Distributel | In Service | La Salle |
| 567 | Fibernetics Corporation | In Service | Lambeth |
| 275 | Fibernetics Corporation | Assigned | Langton |
| 564 | Fibernetics Corporation | In Service | Leamington |
| 700 | IXICA Communications Inc. | In Service | Leamington |
| 784 | Distributel | In Service | Leamington |
| 875 | ISP Telecom | In Service | Leamington |
| 871 | ISP Telecom | In Service | Linwood |
| 355 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 550 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 551 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 552 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 553 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 556 | Rogers Communications Canada Inc. (Wireless) | In Service | Listowel |
| 206 | Bell Canada | In Service | London |
| 216 | Bell Canada | In Service | London |
| 217 | Bell Canada | In Service | London |
| 340 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 341 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 342 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 343 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 344 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 345 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 346 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 347 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 348 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 349 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 388 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 482 | Iristel Inc. | In Service | London |
| 485 | Iristel Inc. | In Service | London |
| 486 | Iristel Inc. | In Service | London |
| 488 | Iristel Inc. | In Service | London |
| 489 | Iristel Inc. | In Service | London |
| 588 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 688 | Rogers Communications Canada Inc. (Cable) | In Service | London |
| 689 | Rogers Communications Canada Inc. (Cable) | In Service | London |
| 690 | Rogers Communications Canada Inc. (Cable) | In Service | London |
| 788 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 866 | Rogers Communications Canada Inc. | In Service | London |
| 881 | Fido Solutions Inc. | In Service | London |
| 888 | Rogers Communications Canada Inc. (Wireless) | In Service | London |
| 991 | TELUS Mobility | In Service | London |
| 237 | Fibernetics Corporation | In Service | Lucan |
| 573 | Fibernetics Corporation | In Service | Lucknow |
| 264 | Fibernetics Corporation | In Service | Maidstone |
| 774 | Distributel | In Service | Maidstone |
| 884 | IXICA Communications Inc. | In Service | Maidstone |
| 363 | Fibernetics Corporation | Assigned | Markdale |
| 265 | Fibernetics Corporation | In Service | McGregor |
| 448 | IXICA Communications Inc. | In Service | McGregor |
| 781 | Distributel | In Service | McGregor |
| 364 | Fibernetics Corporation | Assigned | Meaford |
| 240 | Fibernetics Corporation | In Service | Melbourne |
| 221 | TELUS Integrated Communications | In Service | Mitchell |
| 543 | Fibernetics Corporation | Assigned | Mitchell |
| 544 | Fibernetics Corporation | Assigned | Monkton |
| 241 | Fibernetics Corporation | In Service | Mount Brydges |
| 272 | Fibernetics Corporation | In Service | Mount Forest |
| 335 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 336 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 337 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 339 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 533 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 633 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 733 | Rogers Communications Canada Inc. (Wireless) | In Service | Mount Forest |
| 238 | Fibernetics Corporation | In Service | Nairn |
| 228 | TELUS Integrated Communications | In Service | New Hamburg |
| 231 | TELUS Integrated Communications | In Service | Norwich |
| 213 | Bell Canada | In Service | Orangeville |
| 256 | Fibernetics Corporation | Assigned | Orangeville |
| 208 | Bell Canada | In Service | Owen Sound |
| 877 | Rogers Communications Canada Inc. | In Service | Owen Sound |
| 222 | TELUS Integrated Communications | In Service | Palmerston |
| 545 | Fibernetics Corporation | Assigned | Palmerston |
| 899 | Rogers Communications Canada Inc. | In Service | Paris |
| 568 | Fibernetics Corporation | In Service | Parkhill |
| 230 | TELUS Integrated Communications | In Service | Pelee Island |
| 266 | Fibernetics Corporation | In Service | Pelee Island |
| 785 | Distributel | In Service | Pelee Island |
| 799 | IXICA Communications Inc. | In Service | Pelee Island |
| 233 | ISP Telecom | In Service | Petrolia |
| 843 | Brooke Telecom Co-operative Ltd. | Assigned | Petrolia |
| 261 | Fibernetics Corporation | In Service | Pleasant Park |
| 699 | IXICA Communications Inc. | In Service | Pleasant Park |
| 782 | Distributel | In Service | Pleasant Park |
| 276 | Fibernetics Corporation | Assigned | Port Dover |
| 835 | TELUS Integrated Communications | Assigned | Port Lambton |
| 277 | Fibernetics Corporation | Assigned | Port Rowan |
| 534 | Fibernetics Corporation | In Service | Port Stanley |
| 826 | ISP Telecom | In Service | Rockwood |
| 535 | Fibernetics Corporation | In Service | Rodney |
| 203 | Bell Canada | In Service | Sarnia |
| 995 | TELUS Mobility | In Service | Sarnia |
| 997 | TELUS Mobility | In Service | Sarnia |
| 365 | Fibernetics Corporation | Assigned | Sauble Beach |
| 574 | Fibernetics Corporation | In Service | Seaforth |
| 383 | Rogers Communications Canada Inc. | In Service | Shakespeare |
| 546 | Fibernetics Corporation | Assigned | Shakespeare |
| 536 | Fibernetics Corporation | In Service | Shedden |
| 214 | Bell Canada | In Service | Simcoe |
| 331 | Rogers Communications Canada Inc. (Wireless) | In Service | Simcoe |
| 559 | Fibernetics Corporation | In Service | Simcoe |
| 836 | TELUS Integrated Communications | Assigned | Sombra |
| 366 | Fibernetics Corporation | Assigned | Southampton |
| 537 | Fibernetics Corporation | In Service | Sparta |
| 870 | ISP Telecom | In Service | St. Clements |
| 282 | Rogers Communications Canada Inc. | In Service | St. George |
| 547 | Fibernetics Corporation | Assigned | St. Marys |
| 205 | Bell Canada | In Service | St. Thomas |
| 538 | Fibernetics Corporation | In Service | St. Thomas |
| 258 | Fibernetics Corporation | In Service | Stoney Point |
| 300 | IXICA Communications Inc. | In Service | Stoney Point |
| 771 | Distributel | In Service | Stoney Point |
| 215 | Bell Canada | In Service | Stratford |
| 560 | Fibernetics Corporation | In Service | Stratford |
| 585 | Rogers Communications Canada Inc. | In Service | Stratford |
| 992 | TELUS Mobility | In Service | Stratford |
| 859 | ISP Telecom | In Service | Strathroy |
| 367 | Fibernetics Corporation | Assigned | Tara |
| 223 | TELUS Integrated Communications | In Service | Tavistock |
| 549 | Fibernetics Corporation | Assigned | Tavistock |
| 686 | Rogers Communications Canada Inc. | In Service | Tavistock |
| 565 | Fibernetics Corporation | In Service | Tecumseh |
| 666 | IXICA Communications Inc. | In Service | Tecumseh |
| 776 | Distributel | In Service | Tecumseh |
| 876 | ISP Telecom | In Service | Tecumseh |
| 285 | Quadro Communications Co-operative Inc. | Assigned | Thamesford |
| 368 | Fibernetics Corporation | Assigned | Thornbury |
| 787 | Rogers Communications Canada Inc. | In Service | Thornbury |
| 245 | Fibernetics Corporation | In Service | Thorndale |
| 893 | ISP Telecom | In Service | Tilbury |
| 998 | TELUS Mobility | In Service | Tillsonburg |
| 878 | ISP Telecom | In Service | Wallaceburg |
| 242 | Fibernetics Corporation | In Service | Wardsville |
| 278 | Fibernetics Corporation | Assigned | Waterford |
| 722 | Rogers Communications Canada Inc. (Cable) | In Service | Waterford |
| 229 | TELUS Integrated Communications | In Service | Watford |
| 539 | Fibernetics Corporation | In Service | West Lorne |
| 267 | Fibernetics Corporation | In Service | Wheatley |
| 599 | IXICA Communications Inc. | In Service | Wheatley |
| 786 | Distributel | In Service | Wheatley |
| 369 | Fibernetics Corporation | Assigned | Wiarton |
| 204 | Bell Canada | In Service | Windsor |
| 993 | TELUS Mobility | In Service | Windsor |
| 575 | Fibernetics Corporation | In Service | Wingham |
| 259 | Fibernetics Corporation | In Service | Woodslee |
| 499 | IXICA Communications Inc. | In Service | Woodslee |
| 770 | Distributel | In Service | Woodslee |
| 207 | Bell Canada | In Service | Woodstock |
| 887 | Rogers Communications Canada Inc. (Wireless) | In Service | Woodstock |
| 251 | ISP Telecom | In Service | Wyoming |
| 845 | Brooke Telecom Co-operative Ltd. | Assigned | Wyoming |
63.2% of the exchanges in this area code are still available.