TEN DIGIT DIALING
Ten digit dialing (area code + seven digit number) is necessary when two or more area codes cover the same geographic area. This is called an area code overlay. In this situation two or more different homes in the same geographic area can have the same seven digit phone number but each would have a different area code. Ten digit dialing within area code overlays permits the phone companies to route your call to the correct subscriber.
Most area code overlays involve two area codes covering the same geographic area, however, three or more area codes are used in some highly populated areas. An example is in the state of New York where area codes (212, 332, 646 and 917) and (718, 347, 917 and 929) are utilized as overlays.
With seven digit dialing a caller is permitted to dial only the local seven digit number, without the area code, if the call is to another subscriber within the same area code and no overlays exist. Simply being permitted to dial a seven digit number within the same area code does not mean that long distance charges are not incurred.
Most area code overlays involve two area codes covering the same geographic area, however, three or more area codes are used in some highly populated areas. An example is in the state of New York where area codes (212, 332, 646 and 917) and (718, 347, 917 and 929) are utilized as overlays.
With seven digit dialing a caller is permitted to dial only the local seven digit number, without the area code, if the call is to another subscriber within the same area code and no overlays exist. Simply being permitted to dial a seven digit number within the same area code does not mean that long distance charges are not incurred.
| AREA CODE | LOCATION | DIALING PLAN | COMMENTS |
| 201 | New Jersey | 10 Digits | |
| 203 | Connecticut | 10 Digits | 10 Digits is required in all Connecticut area codes. |
| 204 | Manitoba | 011 | |
| 208 | Idaho | 10 Digits | |
| 210 | Texas | 011 | 10 Digits |
| 212 | New York | 1+10 Digits | |
| 214 | Texas | 011 | 10 Digits |
| 215 | Pennsylvania | 10 Digits (see note) otherwise 1+10 Digits | 10 Digits is permitted between area codes 215, 267, 484 and 610. All other calls are 1+10 digits. |
| 220 | Ohio | 10 Digits | 1+ 10 Digits is permitted |
| 223 | Pennsylvania | 10 Digits | |
| 224 | Illinois | 1+10 Digits | |
| 226 | Ontario | 011 | |
| 234 | Ohio | 10 Digits | |
| 236 | British Columbia | 10 Digits | |
| 240 | Maryland | 10 Digits | |
| 248 | Michigan | 10 Digits | |
| 249 | Ontario | 10 Digits | |
| 250 | British Columbia | 10 Digits | |
| 256 | Alabama | 10 Digits | |
| 267 | Pennsylvania | 10 Digits (see note) otherwise | 1+10 Digits or 10 Digits is permitted between area codes 215, 267, 484 and 610. All other calls are 1+10 digits. |
| 270 | Kentucky | 10 Digits | |
| 272 | Pennsylvania | 10 Digits | |
| 279 | California | 1+10 Digits | |
| 281 | Texas | 10 Digits | |
| 289 | Ontario | 10 Digits | |
| 301 | Maryland | 10 Digits | |
| 303 | Colorado | 10 Digits | |
| 304 | West Virginia | 10 Digits | |
| 305 | Florida | 10 Digits except in Florida Keys. See note. | Florida Keys - 7 Digit Dialing Permitted |
| 306 | Saskatchewan | 10 Digits | |
| 310 | California | 1+10 Digits | |
| 312 | Illinois | 1+10 Digits | |
| 315 | New York | 1+10 Digits | |
| 317 | Indiana | 10 Digits | |
| 321 | Florida | 10 Digits except in Brevard County. See Note | Brevard County - 7 Digit Dialing Permitted |
| 330 | Ohio | 10 Digits | |
| 331 | Illinois | 1+10 Digits | |
| 332 | New York | 1+10 Digits | |
| 336 | North Carolina | 10 Digits | |
| 339 | Massachusetts | 10 Digits | |
| 343 | Ontario | 10 Digits | |
| 346 | Texas | 10 Digits | |
| 347 | New York | 1+10 Digits | |
| 351 | Massachusetts | 10 Digits | |
| 360 | Washington | 10 Digits | |
| 364 | Kentucky | 10 Digits | |
| 365 | Ontario | 10 Digits | |
| 380 | Ohio | 10 Digits | |
| 385 | Utah | 10 Digits | |
| 402 | Nebraska | 10 Digits | |
| 403 | Alberta | 10 Digits | |
| 404 | Georgia | 10 Digits | |
| 407 | Florida | 10 Digits | |
| 408 | California | 10 Digits | |
| 410 | Maryland | 10 Digits | |
| 412 | Pennsylvania | 10 Digits (see note) otherwise 1+10 Digits | 10 Digits is permitted between area codes 412, 724, 878. All other calls are 1+10 digits. |
| 415 | California | 1+10 Digits | |
| 416 | Ontario | 10 Digits | |
| 418 | Quebec | 10 Digits | |
| 419 | Ohio | 10 Digits | |
| 424 | California | 1+10 Digits | |
| 430 | Texas | 10 Digits | |
| 431 | Manitoba | 10 Digits | |
| 437 | Ontario | 10 Digits | |
| 438 | Quebec | 10 Digits | |
| 442 | California | 10 Digits | |
| 443 | Maryland | 10 Digits | |
| 445 | Pennsylvania | 10 Digits (see note) otherwise 1+10 Digits | 10 Digits is permitted between area codes 215, 267, 445, 484 and 610. All other calls are 1+10 digits. |
| 450 | Quebec | 10 Digits | |
| 458 | Oregon | 10 Digits | |
| 463 | Indiana | 10 Digits | |
| 469 | Texas | 10 Digits | |
| 470 | Georgia | 10 Digits | |
| 475 | Connecticut | 10 Digits | 10 Digits is required in all Connecticut area codes. |
| 484 | Pennsylvania | 10 Digits (see note) otherwise 1+10 Digits | 10 Digits is permitted between area codes 215, 267, 484 and 610. All other calls are 1+10 digits. |
| 503 | Oregon | 10 Digits | |
| 508 | Massachusetts | 10 Digits | |
| 512 | Texas | 10 Digits | |
| 514 | Quebec | 10 Digits | |
| 518 | New York | 1+10 Digits | |
| 519 | Ontario | 10 Digits | |
| 531 | Nebraska | 10 Digits | |
| 534 | Wisconsin | 10 Digits | |
| 539 | Oklahoma | 10 Digits | |
| 541 | Oregon | 10 Digits | |
| 548 | Ontario | 10 Digits | |
| 551 | New Jersey | 10 Digits | |
| 564 | Washington | 10 Digits | |
| 567 | Ohio | 10 Digits | |
| 570 | Pennsylvania | 10 Digits | |
| 571 | Virginia | 10 Digits | |
| 579 | Quebec | 10 Digits | |
| 581 | Quebec | 10 Digits | |
| 587 | Alberta | 10 Digits | |
| 601 | Mississippi | 10 Digits | |
| 604 | British Columbia | 10 Digits | |
| 610 | Pennsylvania | 10 Digits (see note) otherwise 1+10 Digits | 10 Digits is permitted between area codes 215, 267, 484 and 610. All other calls are 1+10 digits. |
| 613 | Ontario | 10 Digits | |
| 614 | Ohio | 10 Digits | |
| 615 | Tennessee | 10 Digits | |
| 617 | Massachusetts | 10 Digits | |
| 628 | California | 1+10 Digits | |
| 629 | Tennessee | 10 Digits | |
| 630 | Illinois | 1+10 Digits | |
| 639 | Saskatchewan | 10 Digits | |
| 646 | New York | 1+10 Digits | |
| 647 | Ontario | 10 Digits | |
| 657 | California | 1+10 Digits | |
| 667 | Maryland | 10 Digits | |
| 669 | California | 1+10 Digits | |
| 678 | Georgia | 10 Digits | |
| 680 | New York | 1+10 Digits | |
| 681 | West Virginia | research | |
| 682 | Texas | 10 Digits | |
| 702 | Nevada | 10 Digits | |
| 703 | Virginia | 10 Digits | |
| 704 | North Carolina | 10 Digits | |
| 705 | Ontario | 10 Digits | |
| 706 | Georgia | 10 Digits | |
| 713 | Texas | 10 Digits | |
| 714 | California | 1+10 Digits | |
| 715 | Wisconsin | 10 Digits | |
| 717 | Pennsylvania | 10 Digits | |
| 718 | New York | 1+10 Digits | |
| 720 | Colorado | 10 Digits | |
| 724 | Pennsylvania | 10 Digits | 10 Digits is permitted between area codes 412, 724, 878. All other calls are 1+10 digits. |
| 725 | Nevada | 10 Digits | |
| 726 | Texas | 011 | 10 Digits |
| 732 | New Jersey | 10 Digits | 10 Digits is permitted between area codes 732 and 848. All other calls are 1+10 digits. |
| 737 | Texas | 10 Digits | |
| 740 | Ohio | 10 Digits | 1+ 10 Digits is permitted |
| 743 | North Carolina | 10 Digits | |
| 747 | California | 1+10 Digits | |
| 754 | Florida | 10 Digits | |
| 760 | California | 1+10 Digits | |
| 762 | Georgia | 10 Digits | |
| 769 | Mississippi | 10 Digits | |
| 770 | Georgia | 10 Digits | |
| 773 | Illinois | 1+10 Digits | |
| 774 | Massachusetts | 10 Digits | |
| 778 | British Columbia | 10 Digits | |
| 779 | Illinois | 1+10 Digits | |
| 780 | Alberta | 10 Digits | |
| 781 | Massachusetts | 10 Digits | |
| 782 | Nova Scotia, Prince Edward Island | 10 Digits | |
| 786 | Florida | 10 Digits | |
| 787 | Puerto Rico | 10 Digits | |
| 801 | Utah | 10 Digits | |
| 809 | Dominican Republic | 10 Digits | |
| 812 | Indiana | 10 Digits | |
| 815 | Illinois | 1+10 Digits | |
| 817 | Texas | 10 Digits | |
| 818 | California | 1+10 Digits | |
| 819 | Quebec | 10 Digits | |
| 825 | Alberta | 10 Digits | |
| 829 | Dominican Republic | 10 Digits | |
| 832 | Texas | 10 Digits | |
| 838 | New York | 1+10 Digits | |
| 843 | South Carolina | 1+10 Digits | |
| 847 | Illinois | 1+10 Digits | |
| 848 | New Jersey | 10 Digits | 10 Digits is permitted between area codes 732 and 848. All other calls are 1+10 digits. |
| 849 | Dominican Republic | 10 Digits | |
| 854 | South Carolina | 1+10 Digits | |
| 857 | Massachusetts | 10 Digits | |
| 860 | Connecticut | 10 Digits | 10 Digits is required in all Connecticut area codes. |
| 862 | New Jersey | 10 Digits | 10 Digits is permitted between area codes 862 and 973. All other calls are 1+10 digits. |
| 872 | Illinois | 10 Digits | |
| 873 | Quebec | 10 Digits | |
| 878 | Pennsylvania | 10 Digits | 10 Digits is permitted between area codes 412, 724, 878. All other calls are 1+10 digits. |
| 902 | Nova Scotia, Prince Edward Island | 10 Digits | |
| 903 | Texas | 10 Digits | |
| 905 | Ontario | 10 Digits | |
| 916 | California | 1+10 Digits | |
| 917 | New York | 10 Digits | |
| 918 | Oklahoma | 10 Digits | |
| 919 | North Carolina | 10 Digits | |
| 929 | New York | 1 +10 Digits | |
| 930 | Indiana | 10 Digits | |
| 938 | Alabama | 10 Digits | |
| 939 | Puerto Rico | 10 Digits | |
| 947 | Michigan | 10 Digits | |
| 954 | Florida | 10 Digits | |
| 959 | Connecticut | 10 Digits | 10 Digits is required in all Connecticut area codes. |
| 971 | Oregon | 10 Digits | |
| 972 | Texas | 10 Digits | |
| 973 | New Jersey | 10 Digits | 10 Digits is permitted between area codes 862 and 973. All other calls are 1+10 digits. |
| 978 | Massachusetts | 10 Digits | |
| 980 | North Carolina | 10 Digits | |
| 984 | North Carolina | 10 Digits | |
| 986 | Idaho | 10 Digits |
