| 401 | Rhode Island (all)More information at: Area Code 401 Phone Number Blocks |
| 402 | Nebraska (Lincoln, Norfolk, Omaha, Superior, Crofton and eastern Nebraska)More information at: Area Code 402 Phone Number Blocks |
| 403 | Alberta (Calgary, Banff, Red Deer, Medicine Hat, Lethbridge, Brooks and southern Alberta)More information at: Area Code 403 Phone Number Blocks |
| 404 | Georgia (Atlanta area inside Interstate 285 perimeter, overlay by 678)More information at: Area Code 404 Phone Number Blocks |
| 405 | Oklahoma (Oklahoma City, Stillwater, Edmond, Norman, Shawnee, Chickasha and central Oklahoma)More information at: Area Code 405 Phone Number Blocks |
| 406 | Montana (all)More information at: Area Code 406 Phone Number Blocks |
| 407 | Florida (Orlando, Cocoa Beach, St. Cloud and central eastern Florida, partial overlay with 321)More information at: Area Code 407 Phone Number Blocks |
| 408 | California (Los Gatos, Milpitas, Sunnyvale, Cupertino and San Jose area)More information at: Area Code 408 Phone Number Blocks |
| 409 | Texas (Beaumont, Galveston, Port Arthur, Jasper and Southeast Texas)More information at: Area Code 409 Phone Number Blocks |
| 410 | Maryland (Annapolis, Baltimore, Salisbury and eastern Maryland, overlays with 443)More information at: Area Code 410 Phone Number Blocks |
| 411 | Directory Services; 1-areacode-555-1212 is also used.More information at: Area Code 411 Phone Number Blocks |
| 412 | Pennsylvania (Pittsburgh area, McKeesport, Braddock, Duquesne, overlays with 878)More information at: Area Code 412 Phone Number Blocks |
| 413 | Massachusetts (Pittsfield, Springfield, Holyoke, Greenfield and western Massachusetts)More information at: Area Code 413 Phone Number Blocks |
| 414 | Wisconsin (Milwaukee and nearby suburbs)More information at: Area Code 414 Phone Number Blocks |
| 415 | California (San Francisco, Marin County)More information at: Area Code 415 Phone Number Blocks |
| 416 | Ontario (Toronto; overlays with 647)More information at: Area Code 416 Phone Number Blocks |
| 417 | Missouri (Joplin, Springfield, West Plains, Lamar, Lebanon and southwestern Missouri)More information at: Area Code 417 Phone Number Blocks |
| 418 | Quebec (Quebec City, Saguenay, Gaspe Peninsula, Cote-Nord, Chibougamau, St-Georges, overlays with 581)More information at: Area Code 418 Phone Number Blocks |
| 419 | Ohio (Toledo, Sylvania, Mansfield, Lima, Findlay,Bryan, Sandusky, Bowling Green and northwestern Ohio, overlays with 567)More information at: Area Code 419 Phone Number Blocks |
| 423 | Tennessee (Two disconnected portions of East Tennessee-Bristol, Johnson City, Kingsport in north; Chattanooga, Cleveland in south), split from 615More information at: Area Code 423 Phone Number Blocks |
| 424 | California (West Los Angeles), overlay with area code 310More information at: Area Code 424 Phone Number Blocks |
| 425 | Washington (north and east Seattle suburbs including Everett, Bellevue, Redmond, Renton, Kirkland, Bothell, Issaquah, Edmonds, Lynnwood and Mountlake Terrace)More information at: Area Code 425 Phone Number Blocks |
| 430 | Texas (Northeast Texas, overlays with area code 903)More information at: Area Code 430 Phone Number Blocks |
| 432 | Texas (West Texas: Big Spring, Midland, Odessa)More information at: Area Code 432 Phone Number Blocks |
| 434 | Virginia (Lynchburg, Danville, Farmville, South Hill, Charlottesville; southside and south-central Virginia)More information at: Area Code 434 Phone Number Blocks |
| 435 | Utah (Logan, Park City, St. George, Moab and all of Utah excluding Salt Lake City, Ogden, Provo, Morgan County, Utah, Davis County, Utah, and north central Utah)More information at: Area Code 435 Phone Number Blocks |
| 438 | Quebec (Montreal area; overlays with 514)More information at: Area Code 438 Phone Number Blocks |
| 440 | Ohio (Cleveland suburbs, Elyria, Lorain, Oberlin, Wellington and north central Ohio)More information at: Area Code 440 Phone Number Blocks |
| 441 | Bermuda, split from 809. (all)More information at: Area Code 441 Phone Number Blocks |
| 442 | California This Area code is scheduled to provide numbering relief to Area code 760 but no date has been assigned for this to go into effect.More information at: Area Code 442 Phone Number Blocks |
| 443 | Maryland (Annapolis, Baltimore, Salisbury and eastern Maryland, overlays with 410)More information at: Area Code 443 Phone Number Blocks |
| 445 | Pennsylvania (Philadelphia area, overlays with 215 and 267) Area code 445 is listed in the North American Numbering Plan web site and other sites (see the Pennsylvania Public Utility Commission web site) as no longer assigned for any location.More information at: Area Code 445 Phone Number Blocks |
| 447 | IllinoisMore information at: Area Code 447 Phone Number Blocks |
| 450 | Quebec (central southern Quebec including the city of Laval but excluding Montreal)More information at: Area Code 450 Phone Number Blocks |
| 456 | Inbound International CallsMore information at: Area Code 456 Phone Number Blocks |
| 464 | Illinois Overlay of Area code 708More information at: Area Code 464 Phone Number Blocks |
| 469 | Texas (Dallas area, overlays with 214 and 972)More information at: Area Code 469 Phone Number Blocks |
| 470 | Georgia (future overlay for metro Atlanta, over 404/678 and 770/678 areas)More information at: Area Code 470 Phone Number Blocks |
| 473 | Grenada, split from 809. (all)More information at: Area Code 473 Phone Number Blocks |
| 475 | Connecticut (Bridgeport, New Haven, Waterbury and southwestern Connecticut, overlays with 203).More information at: Area Code 475 Phone Number Blocks |
| 478 | Georgia (Macon, Warner Robins, Swainsboro, Wadley, Milledgeville, Perry and central Georgia)More information at: Area Code 478 Phone Number Blocks |
| 479 | Arkansas (Fort Smith, Fayetteville and northwestern Arkansas)More information at: Area Code 479 Phone Number Blocks |
| 480 | Arizona (Mesa, Chandler, Gilbert, Tempe, Queen Creek, Scottsdale, eastern Phoenix area and eastern Phoenix suburbs only)More information at: Area Code 480 Phone Number Blocks |
| 484 | Pennsylvania (Reading, Allentown, Chester and southeastern Pennsylvania, overlays with 610 and 835)More information at: Area Code 484 Phone Number Blocks |
