Here They Are!
Area codes and their corresponding geographical locations are listed below. 

201 - New Jersey (major cities: Hackensack, Jersey City, Newark)
202 - Washington, DC (all locations)
203 - Connecticut (major city: New Haven)
204 - Manitoba (all locations)
205 - Alabama (major cities: Birmingham, Huntsville)
206 - Washington (major cities: Seattle, Tacoma)
207 - Maine (all locations)
208 - Idaho (all locations)
209 - California (major cities: Fresno, Modesto)
210 - Texas (major cities: Laredo, San Antonio)
212 - New York (major city: New York City)
213 - California (major city: Los Angeles)
214 - Texas (major cities: Dallas, Tyler)
215 - Pennsylvania (major city: Philadelphia)
216 - Ohio (major cities: Akron, Canton, Cleveland, Youngstown)
217 - Illinois (major cities: Champaign-Urbana, Springfield)
218 - Minnesota (major city: Duluth)
219 - Indiana (major cities: Gary, Hammond, South Bend)
242 - Bahamas (all locations)
246 - Barbados (all locations)
250 - British Columbia (Interior of British Columbia, Vancouver Island)
268 - Antigua and Barbuda (all locations)
281 - Texas (major city: Houston "layover" - NOT IN USE)
301 - Maryland (major cities: Hagerstown, Rockville)
302 - Delaware (all locations)
303 - Colorado (major cities: Boulder, Denver)
304 - West Virginia (all locations)
305 - Florida (major cities: Key West, Miami)
306 - Saskatchewan (all locations)
307 - Wyoming (all locations)
308 - Nebraska (major cities: Grand Island, North Platte, Scottsbluff)
309 - Illinois (major cities: Peoria, Rock Island)
310 - California (major city: Long Beach)
312 - Illinois (major city: Chicago)
313 - Michigan (major cities: Ann Arbor, Detroit)
314 - Missouri (major cities: Columbia, Jefferson, St. Louis)
315 - New York (major cities: Syracuse, Utica)
316 - Kansas (major cities: Dodge City, Hutchinson, Wichita)
317 - Indiana (major cities: Indianapolis, Kokomo)
318 - Louisiana (major cities: Lake Charles, Shreveport)
319 - Iowa (major cities: Cedar Rapids, Davenport, Dubuque)
320 - Minnesota (major cities: Alexandria, St. Cloud)
330 - Ohio (Eastern Ohio)
334 - Alabama (major cities: Montgomery, Mobile)
345 - Cayman Islands (all locations)
352 - Florida (major city: Gainesville)
360 - Washington (major cities: Bellingham, Olympia, Vancouver)
401 - Rhode Island (all locations)
402 - Nebraska (major cities: Lincoln, Omaha)
403 - Alberta (all locations)
404 - Georgia (major city: Atlanta)
405 - Oklahoma (major cities: Enid, Oklahoma City)
406 - Montana (all locations)
407 - Florida (major cities: Orlando, West Palm Beach)
408 - California (major cities: Monterey, San Jose)
409 - Texas (major cities: Beaumont, Galveston)
410 - Maryland (major cities: Annapolis, Baltimore)
412 - Pennsylvania (major city: Pittsburgh)
413 - Massachusetts (major cities: Pittsfield, Springfield)
414 - Wisconsin (major cities: Green Bay, Milwaukee, Racine)
415 - California (major city: San Francisco)
416 - Ontario (major city: Toronto)
417 - Missouri (major cities: Joplin, Springfield)
418 - Quebec (major city: Quebec)
419 - Ohio (major city: Toledo)
423 - Tennessee (major cities: Chattanooga, Knoxville)
441 - Bermuda (all locations)
501 - Arkansas (all locations)
502 - Kentucky (major cities: Bowling Green, Louisville, Paducah)
503 - Oregon (major cities: Portland, Salem)
504 - Louisiana (major cities: Baton Rouge, New Orleans)
505 - New Mexico (all locations)
506 - New Brunswick (all locations)
507 - Minnesota (major city: Rochester)
508 - Massachusetts (major cities: Lowell, New Bedford, Worcester)
509 - Washington (major cities: Spokane, Walla Walla, Yakima)
510 - California (major cities: Oakland, Berkeley)
512 - Texas (major cities: Austin, Corpus Christi)
513 - Ohio (major cities: Cincinnati, Dayton)
514 - Quebec (major city: Montreal)
515 - Iowa (major city: Des Moines)
516 - New York (major cities: Hempstead, Long Island)
517 - Michigan (major cities: Bay City, Jackson, Lansing)
518 - New York (major cities: Albany, Schenectady, Troy)
519 - Ontario (major city: Windsor)
520 - Arizona (major cities: Flagstaff, Tucson, Yuma)
540 - Virginia (major city: Roanoke)
541 - Oregon (Southern and Eastern Oregon)
561 - Florida (major cities: Boca Raton, Sebastian)
562 - California (Southern California - NOT IN USE)
573 - Missouri (Major cities: Columbia, Jefferson City)
601 - Mississippi (all locations)
602 - Arizona (major city: Phoenix)
603 - New Hampshire (all locations)
604 - British Columbia (all locations)
605 - South Dakota (all locations)
606 - Kentucky (major cities: Ashland, Lexington, Winchester)
607 - New York (major cities: Binghamtom, Elmira, Ithaca)
608 - Wisconsin (major cities: La Crosse, Madison)
609 - New Jersey (major cities: Atlantic City, Camden, Trenton)
610 - Pennsylvania (major cities: Philadelphia suburbs, Allentown)
612 - Minnesota (major cities: Minneapolis, St. Paul, Saint Cloud)
613 - Ontario (major cities: Kingston, Ottawa)
614 - Ohio (major cities: Columbus, Steubenville)
615 - Tennessee (major city: Nashville)
616 - Michigan (major cities: Battle Creek, Grand Rapids, Kalamazoo)
617 - Massachusetts (major cities: Boston, Cambridge, Winchester)
618 - Illinois (major cities: Alton, Cairo, East St. Louis)
619 - California (major cities: Barstow, Palm Springs, San Diego)
630 - Illinois (major cities: Aurora, Naperville, Oak Brook)
664 - Montserrat (all locations)
701 - North Dakota (all locations)
702 - Nevada (all locations)
703 - Virginia (major cities: Alexandria, Arlington)
704 - North Carolina (major cities: Asheville, Charlotte)
705 - Ontario (major city: Sault Ste. Marie)
706 - Georgia (major cities: Augusta, Columbus, Rome)
707 - California (major cities: Eureka, Santa Rosa)
708 - Illinois (major cities: Chicago suburbs, Evanston, Waukegan)
709 - Newfoundland (major cities: Labrador City, St. John's)
712 - Iowa (major cities: Council Bluffs, Sioux City)
713 - Texas (major city: Houston)
714 - California (major city: Anaheim)
715 - Wisconsin (major cities: Eau Claire, Wausau)
716 - New York (major cities: Buffalo, Niagara Falls, Rochester)
717 - Pennsylvania (major cities: Harrisburg, Scranton, Wilkes-Barre)
718 - New York (major cities: Bronx, Brooklyn, Queens, Staten Island)
719 - Colorado (major cities: Colorado Springs, Pueblo)
757 - Virginia (major city: Norfolk)
758 - St. Lucia (all locations)
770 - Georgia (major cities: Atlanta suburbs)
773 - Illinois (major city: Chicago)
787 - Puerto Rico (all locations)
800 - Toll-Free (free for caller)
801 - Utah (all locations)
802 - Vermont (all locations)
803 - South Carolina (major cities: Charleston, Columbia, Florence)
804 - Virginia (major cities: Newport News, Richmond)
805 - California (major cities: Bakersfield, Santa Barbara)
806 - Texas (major cities: Amarillo, Lubbock)
807 - Ontario (major city: Fort William)
808 - Hawaii (all locations)
809 - Caribbean Islands, Jamaica, Virgin Islands, and more...
810 - Michigan (major cities: Flint, Northern Detroit suburbs)
812 - Indiana (major city: Evansville)
813 - Florida (major cities: St. Petersburg, Tampa)
814 - Pennsylvania (major cities: Altoona, Erie)
815 - Illinois (major cities: Joliet, La Salle, Rockford)
816 - Missouri (major cities: Independence, Kansas City, St. Joseph)
817 - Texas (major cities: Fort Worth, Waco)
818 - California (major city: Pasadena)
819 - Quebec (major city: Noranda)
847 - Illinois (major cities: Chicago - northern suburbs)
860 - Connecticut (major city: Hartford)
864 - South Carolina (major city: Greenville)
869 - St. Kitts and Nevis (all locations)
888 - Toll-Free (free for caller)
900 - Pay-Per-Call (caller pays)
901 - Tennessee (major city: Memphis)
902 - Nova Scotia (all locations)
903 - Texas (major cities: Texarkana, Tyler)
904 - Florida (major cities: Jacksonville, Pensacola, Tallahassee)
905 - Ontario (major city: Mississauga)
906 - Michigan (major cities: Marquette, Sault Ste. Marie)
907 - Alaska (all locations)
908 - New Jersey (major cities: Elizabeth, New Brunswick)
909 - California (major cities: Riverside, San Bernardino)
910 - North Carolina (major cities: Greensboro, Winston-Salem)
912 - Georgia (major cities: Albany, Macon, Savannah)
913 - Kansas (major cities: Lawrence, Salina, Topeka)
914 - New York (major cities: Peekskill, White Plains, Yonkers)
915 - Texas (major cities: Abilene, El Paso)
916 - California (major city: Sacramento)
917 - New York (major city: New York City - cellular)
918 - Oklahoma (major city: Tulsa)
919 - North Carolina (major cities: Fayetteville, Raleigh)
937 - Ohio (area north of, but not including Cincinnati)
941 - Florida (major cities: Ft. Myers, Naples, Sarasota)
954 - Florida (major city: Fort Lauderdale)
970 - Colorado (major cities: Aspen, Fort Collins, Grand Junction)
972 - Texas (major city: Dallas suburbs, Irving)