Area codes grow in ascending order from left to right.
| 201 - New Jersey (Newark) | 202 - Washington, DC | 203 - Connecticut | 205 - Alabama | 206 - Washington (Seattle) |
| 207 - Maine | 208 - Idaho | 209 - California (Fresno) | 210 - Texas (San Antonio) | 212 - New York |
| 213 - California (Los Angeles) | 214 - Texas (Dallas) | 215 - Pennsylvania (Phila.) | 216 - Ohio (Cleveland) | 217 - Illinois (Springfield) |
| 218 - Minnesota (Duluth) | 219 - Indiana (South Bend) | 301 - Maryland (Bethesda) | 302 - Delaware | 303 - Colorado (Denver) |
| 304 - West Virginia | 305 - Florida (Miami) | 307 - Wyoming | 308 - Nebraska (North Platte) | 309 - Illinois (Peoria) |
| 310 - California (Los Angeles) | 312 - Illinois (Chicago) | 313 - Michigan (Detroit) | 314 - Missouri (St. Louis) | 315 - New York (Syracuse) |
| 316 - Kansas (Wichita) | 317 - Indiana (Indianapolis) | 318 - Louisiana (Shreveport) | 319 - Iowa (Dubuque) | 401 - Rhode Island |
| 402 - Nebraska (Omaha) | 403 - Alberta, Northwest Territories, and Yukon | 404 - Georgia (Atlanta) | 405 - Oklahoma (Oklahoma City) | 406 - Montana |
| 407 - Florida (Orlando) | 408 - California (San Jose) | 409 - Texas (Galveston) | 410 - Maryland (Baltimore) | 412 - Pennsylvania (Pittsburgh) |
| 413 - Massachusetts (Springfield) | 414 - Wisconsin (Milwaukee) | 415 - California (San Francisco) | 416 - Ontario (Toronto) | 417 - Missouri (Springfield) |
| 418 - Quebec (Quebec) | 419 - Ohio (Toledo) | 423 - Tennessee (Knoxville) | 501 - Arkansas | 502 - Kentucky (Louisville) |
| 503 - Oregon (Portland) | 504 - Louisiana (New Orleans) | 505 - New Mexico | 506 - New Brunswick | 507 - Minnesota (Rochester) |
| 508 - Massachusetts (Worcester) | 509 - Washington (Spokane) | 510 - California (Oakland) | 512 - Texas (Austin) | 513 - Ohio (Cincinnati) |
| 514 - Quebec (Montreal) | 515 - Iowa (Des Moines) | 516 - New York (Long Island) | 517 - Michigan (Lansing) | 518 - New York (Albany) |
| 519 - Ontario (London) | 541 - Oregon (Eugene) | |||
| 601 - Mississippi | 602 - Arizona | 603 - New Hampshire | 604 - British Columbia | 605 - South Dakota |
| 606 - Kentucky (Newport) | 607 - New York (Ithaca) | 608 - Wisconsin (Madison) | 609 - New Jersey (Trenton) | 610 - Pennsylvania (Reading) |
| 612 - Minnesota (Minneapolis) | 614 - Ohio (Columbus) | 615 - Tennessee (Nashville) | 616 - Michigan (Grand Rapids) | 617 - Massachusetts |
| 618 - Illinois (Centralia) | 619 - California (San Diego) | 701 - North Dakota | 702 - Nevada | 703 - Virginia (Arlington) |
| 704 - North Carolina (Charlotte) | 705 - Ontario (North Bay) | 706 - Georgia | 707 - California (Santa Rosa) | 708 - Illinois (Des Plaines) |
| 712 - Iowa (Council Bluffs) | 713 - Texas (Houston) | 714 - California (Orange County) | 715 - Wisconsin (Eau Clair) | 716 - New York (Buffalo) |
| 717 - Pennsylvania (Harrisburg) | 718 - New York (Brooklyn, Bronx, Queens, Staten Island) | 719 - Colorado (Colorado Springs) | 801 - Utah | 802 - Vermont |
| 803 - South Carolina | 804 - Virginia (Richmond) | 805 - California (Bakersfield) | 806 - Texas (Amarllo) | 807 - Ontario |
| 808 - Hawaii | 810 - Michigan (Pontiac) | 812 - Indiana (Evansville) | 813 - Florida (Fort Myers) | 814 - Pennsylvania (Erie) |
| 815 - Illinois (Rockford) | 816 - Missouri (Kansas City) | (817) Texas (Fort Worth) | 818 - California (Los Angeles) | 819 - Quebec and Northwest Territories |
| 901 - Tennessee (Memphis) | 902 - Nova Scotia | 903 - Texas (Dallas) | 904 - Florida (Jacksonville) | 905 - Ontario (Toronto) |
| 906 - Michigan (Marquette) | 907 - Alaska | 908 - New Jersey (Elizabeth) | 909 - California (San Bernardino) | 910 - North Carolina (Winston-Salem) |
| 912 - Georgia (Savannah) | 913 - Kansas (Topeka) | 914 - New York (White Plains) | 915 - Texas (El Paso) | 916 - California (Sacramento) |
| 917 - New York (cellular) | 918 - Oklahoma (Tulsa) | 919 - North Carolina | 931 - Tennessee (Middle Tennessee) |