The cities named after the colons are where the switches for the area code is located.
201 NJ N New Jersey: Newark 202 DC Washington, D.C. 203 CT Connecticut 204 Manitoba 205 AL Alabama (if you know where the switch for this is, email me) 206 WA W Washington state: Seattle 207 ME Maine 208 ID Idaho 209 CA Cent. California: Fresno 210 TX S Texas: San Antonio 212 NY New York City, New York 213 CA Los Angeles, California 214 TX Mid NE Texas: Dallas 215 PA SE Pennsylvania: Philadelphia 216 OH Cleveland 217 IL Cent. Illinois: Springfield 218 MN N Minnesota: Duluth 219 IN N Indiana: South Bend 242 Bahamas 246 Barbados 250 British Columbia 281 TX Texas: Houston Metro 301 MD W Maryland: Silver Spring, Frederick 302 DE Delaware 303 CO Central Colorado: Denver 304 WV West Virginia 305 FL SE Florida: Miami 306 Saskatchewan 307 WY Wyoming 308 NE W Nebraska: North Platte 309 IL NW Illinois: Peoria 310 CA Los Angeles, California 312 IL Chicago, Illinois 313 MI E Michigan: Detroit 314 MO SE Missouri: St Louis metro area only (see 573) 315 NY N Cent. New York: Syracuse 316 KS S Kansas: Wichita 317 IN Cent. Indiana: Indianapolis 318 LA W Louisiana: Shreveport 319 IA E Iowa: Cedar Rapids 320 MN Cent. Minnesota: Minneapolis (rural Minn, excl St. Paul/Minneapolis) 330 OH NE Ohio: Akron, Canton 334 AL S Alabama: S of Montgomery, incl Mobile and coastal areas (if you know where the switch for this is, email me) 352 FL Gainesville area 360 WA W Washington State (except Seattle area) 401 RI Rhode Island 402 NE E Nebraska: Omaha 403 Alberta 404 GA N Georgia: Atlanta 405 OK W Oklahoma: Oklahoma City 406 MT Montana 407 FL E Florida: West Palm Beach 408 CA Cent. Coastal California: San Jose 409 TX SE Texas: Galveston 410 MD E Maryland: Baltimore, Annapolis 412 PA W Pennsylvania: Pittsburgh 413 MA W Massachusetts: Springfield 414 WI SE Wisconsin: Milwaukee 415 CA San Francisco, California 416 S Cent. Ontario: Toronto 417 MO SW Missouri: Springfield 418 NE Quebec: Quebec 419 OH NW Ohio: Toledo 423 TN Tennessee 441 Bermuda 501 AR Arkansas 502 KY W Kentucky: Louisville 503 OR Oregon 504 LA E Louisiana: New Orleans 505 NM New Mexico 506 New Brunswick 507 MN S Minnesota: Rochester 508 MA Cent. Massachusetts: Framingham 509 WA E Washington state: Spokane 510 CA California: Oakland, East Bay 512 TX S Texas: Austin, Corpus Christi 513 OH SW Ohio: Dayton 514 SW Quebec: Montreal 515 IA Cent. Iowa: Des Moines 516 NY Long Island, New York: Hempstead 517 MI Cent. Michigan: Lansing 518 NY NE New York: Albany 519 SW Ontario: Windsor 520 AZ Arizona outside the Phoenix area 540 VA Roanoke and nearby area 541 OR Oregon 561 FL Florida (S. Centra) 562 CA California: Los Angeles 573 MO SE Missouri: excluding St Louis metro area 601 MS Mississippi 602 AZ Phoenix Arizona 603 NH New Hampshire 604 British Columbia 605 SD South Dakota 606 KY E Kentucky: Ashland 607 NY S Cent. New York: Ithaca, Binghamton 608 WI SW Wisconsin: Madison 609 NJ S New Jersey: Trenton 610 PA SE Pennsylvania: Allentown, Reading 612 MN Cent. Minnesota: Minneapolis (St. Paul/Minneapolis) 613 SE Ontario: Ottawa 614 OH SE Ohio: Columbus 615 TN E Tennessee: Nashville 616 MI W Michigan: Grand Rapids 617 MA E Massachusetts: Boston 618 IL S Illinois: Centralia 619 CA S California: San Diego 630 IL W NW Illinois (effective 8/3/96) 701 ND North Dakota 702 NV Nevada 703 VA NW Virginia: Arlington 704 NC W North Carolina: Charlotte 705 NW Ontario: Sault Ste. Marie 706 GA N Georgia: Columbus, Augusta 707 CA NW California: Santa Rosa 708 IL Cent. NW Illinois: Oak Brook 709 Newfoundland 712 IA W Iowa: Council Bluffs 713 TX Mid SE Texas: Houston 714 CA S Coastal California: San Diego 715 WI N Wisconsin: Eau Claire 716 NY NW New York: Buffalo, Rochester 717 PA E Pennsylvania: Wilkes-Barre, Scranton 718 NY New York City, New York 719 CO SE Colorado: Pueblo, Colorado Springs 770 GA Atlanta and suburbs 787 PR Puerto Rico 801 UT Utah 802 VT Vermont 803 SC South Carolina 804 VA E Virginia: Richmond 805 CA S Cent. Coastal California: Bakersfield 806 TX Panhandle Texas: Amarillo 807 W Ontario: Thunder Bay 808 HI Hawaii 809 Bermuda, Puerto Rico, Virgin Islands, Caribbean 810 MI E Michigan: Flint, Pontiac 812 IN S Indiana: Evansville 813 FL SW Florida: St. Petersburg (see 941) 814 PA Cent. Pennsylvania: Erie 815 IL NE Illinois: Rockford 816 MO N Missouri: Kansas City 817 TX N Cent. Texas: Fort Worth 818 CA Los Angeles, California 819 NW Quebec: Trois Rivieres 847 IL Northern NW Illinois: Oak Brook 860 CT Connecticut 864 SC South Carolina 901 TN W Tennessee: Memphis 902 Nova Scotia, Prince Edward Island 903 TX NE Texas: Tyler 904 FL N Florida: Jacksonville 905 S Cent. Ontario: Hamilton 906 MI Upper Michigan: Escanaba 907 AK Alaska 908 NJ Cent. New Jersey: New Brunswick 909 CA Inland empire 910 NC Cent. North Carolina: Greensboro 912 GA S Georgia: Savannah 913 KS N Kansas: Topeka 914 NY S New York: White Plains 915 TX W Texas: Sweetwater 916 CA NE California: Sacramento 917 NY New York City, New York 918 OK E Oklahoma: Tulsa 919 NC E North Carolina: Raleigh 941 FL SW Florida: Tampa Area (part of what used to be 813) 954 FL Broward County area, incl Ft. Lauderdale 970 CO N and W Colorado 972 TX Texas: Dallas MetroIf you have any corrections, please send email to bsy@cs.ucsd.edu Last updated 24 Feb 1996.