Nach dem Regionalcode folgen (mit Ausnahme von Sonderrufnummern) immer 7 weitere Ziffern der eigentlichen Rufnummer. Die ersten 3 Ziffern hiervon gehören ursprünglich zum jeweiligen Telekommunikationsanbieter. Diese sind aber nicht im ganzen Land gleich, sondern werden innerhalb eines jeden Area-Codes neu vergeben. Mit Einführung der Rufnummernmitnahme, also dem Mitnehmen einer vorhandenen Rufnummer zu einem anderen Anbieter verwässert diese Zuordnung aber weitestgehend. Beantragt man eine neue Telefonnummer, so kann man meist aus mehreren dieser anbieterspezifischen Nummern auswählen. Erst die letzten 4 Stellen der Nummer sind tatsächlich frei vergeben.
Ein Area Code muss nicht immer für eine einzelne Stadt stehen. Er kann auch für ein größeres Gebiet mit mehreren Städten gelten. Umgekehrt ist z.B. der Stadtbereich New York gleich in mehrere Gebiete aufgeteilt, weil hier besonders viele Menschen leben. Vor allem in den stark wachsenden Ballungsräumen reicht dies mit der Zeit kaum noch aus. So ordnet man einer Region nach und nach weitere Vorwahlen zu, die allerdings nicht fortlaufend sind. Eine solche Zuordnung mehrerer Codes zu einem Gebiet nennt man "overlay", also übersetzt "Überlagerung". Begonnen hat man im Jahr 1947 mit 86 Nummern. Mittlerweile sind es über 450. Davon 357 allein in den USA. Codes mit einer 0 oder 1 am Anfang gibt es nicht. Auch sind mehrere Kombinationen für Sonderrufnummern reserviert.
An den Nummern kann man allerdings nicht einmal eine grobe geografische Einordnung vornehmen. Eine aufsteigende Reihenfolge von West nach Ost oder von Nord nach Süd gibt es nicht. Allein das dicht besiedelte Kalifornien hat 40 Vorwahlen im Bereich von 209 bis 951. Der District of Columbia hat lediglich zwei Vorwahlen (202 und 771).
Um zu erkennen, woher eine Rufnummer stammt, verwendet man daher umfangreiche Listen, die in den meisten Telefonen bereits einprogrammiert sind. So wird dem Angerufenen automatisch signalisiert, aus welcher Region der Anruf kommt.
Anders als in den meisten anderen Ländern werden in den USA keine einzelnen Rufnummernbereiche oder gar Vorwahlen speziell für den Mobilfunk bereitgestellt. Es ist somit für den Anrufenden nicht erkennbar, ob er gerade auf einem Festnetzanschluss oder einem Mobiltelefon anruft. Natürlich kosten Verbindungen in ein Mobilfunknetz auch in den USA mehr, als innerhalb des klassischen Fetznetzes. Den Aufpreis für die Mobilfunkverbindung trägt daher der Angerufene. Früher konnte dies für ihn schnell sehr viel Geld kosten. Mittlerweile haben aber alle US-amerikanischen Anbieter Flatrates im Angebot, die oft nicht mehr als ein paar Dollar pro Monat kosten. Damit bleiben die Kosten für eingehende Anrufe überschaubar.
Vorwahl | Regionen |
---|
209, 350 | Atwater, Ceres, Lodi, Los Banos, Manteca, Merced, West Modesto, Stockton, Tracy, Turlock |
323, 738, 213 | Los Angeles, Bell, Cudahy, Florence-Graham, Maywood, Montebello, South Gate, West Hollywood, Westmont |
310, 424 | Beverly Hills, West Carson, Culver City, Gardena, Hawthorne, Inglewood, Lawndale, Lennox, Lomita, Lynwood, Manhattan Beach, Rancho Palos Verdes, Redondo Beach, Santa Monica, Torrance |
408, 669 | Campbell, Gilroy, Los Gatos, Milpitas, Morgan Hill, San Jose, Santa Clara, Saratoga, Sunnyvale |
415, 628 | Novato, San Anselmo, South San Francisco, San Rafael |
442 | La Quinta, Oceanside, Palm Desert, Palm Springs, Ridgecrest, San Marcos, Victorville, Vista, Apple Valley, Barstow, Brawley, Calexico, Carlsbad, Cathedral City, Coachella, El Centro, Encinitas, Escondido, Fallbrook, Hesperia, Indio |
510, 341 | Alameda, Berkeley, Castro Valley, El Cerrito, Fremont, Hayward, Newark, Oakland, Richmond, San Leandro, San Lorenzo, San Pablo, Union City |
530, 837 | Chico, Davis, Paradise, Redding, South Lake Tahoe, Woodland, Yuba City |
559 | Clovis, Fresno, Hanford, Madera, Porterville, Reedley, Tulare, Visalia |
562 | Bellflower, Cerritos, Downey, La Habra, La Mirada, Lakewood, Long Beach, Norwalk, Paramount, Pico Rivera, Seal Beach, South Whittier, West Whittier-Los Nietos, Whittier |
619, 858 | Chula Vista, Coronado, El Cajon, Imperial Beach, La Mesa, La Presa, Lemon Grove, National City, Rancho San Diego, San Diego, Poway, Santee, Spring Valley |
626 | Alhambra, Altadena, Arcadia, Azusa, Baldwin Park, West Covina, Duarte, South El Monte, Glendora, Hacienda Heights, La Puente, Monrovia, Monterey Park, South Pasadena, Rosemead, Rowland Heights, South San Gabriel, South San Jose Hills, Temple City, Valinda, Walnut, West Puente Valley |
650 | Belmont, Burlingame, Daly City, East Palo Alto, Foster City, Los Altos, Menlo Park, Millbrae, Mountain View, Pacifica, Palo Alto, Redwood City, San Bruno, San Carlos, San Mateo, South San Francisco |
657, 714 | Anaheim, Brea, Buena Park, Cypress, Fountain Valley, Fullerton, Garden Grove, Huntington Beach, Orange, Placentia, Santa Ana, Stanton, North Tustin, Westminster, Yorba Linda |
661 | Bakersfield, Delano, Lancaster, Oildale, Palmdale, Santa Clarita, Wasco |
707, 369 | Benicia, Eureka, Fairfield, Napa, Petaluma, Rohnert Park, Santa Rosa, Suisun, Vacaville, Vallejo, Windsor |
747, 818 | Agoura Hills, Burbank, Calabasas, North Glendale, La Cañada Flintridge, San Fernando |
760 | Apple Valley, Barstow, Brawley, Calexico, Carlsbad, Cathedral City, Coachella, El Centro, Encinitas, Escondido, Fallbrook, Hesperia, Indio, La Quinta, Oceanside, Palm Desert, Palm Springs, Ridgecrest, San Marcos, Victorville, Vista |
805, 820 | Atascadero, Camarillo, Paso Robles, Goleta, Lompoc, Moorpark, Orcutt, Oxnard, Port Hueneme, Ventura, San Luis Obispo, Santa Barbara, Santa Maria, Santa Paula, Simi Valley, Thousand Oaks |
831 | Hollister, Marina, Monterey, Salinas, Santa Cruz, Seaside, Watsonville |
909, 840 | Chino, Chino Hills, Claremont, Colton, Diamond Bar, Fontana, Highland, La Verne, Montclair, Ontario, Pomona, Rancho Cucamonga, Redlands, Rialto, San Bernardino, San Dimas, Upland, Yucaipa |
916, 279 | Arden-Arcade, Carmichael, Citrus Heights, Elk Grove, North Fair Oaks, Florin, Folsom, La Riviera, Laguna, North Highlands, Orangevale, Rancho Cordova, Rocklin, Rosemont, Roseville, West Sacramento |
925 | Antioch, Bay Point, Brentwood, Concord, Danville, Dublin, Lafayette, Livermore, Martinez, Oakley, Pittsburg, Pleasant Hill, Pleasanton, San Ramon, Walnut Creek |
949 | Aliso Viejo, Costa Mesa, Dana Point, Irvine, Laguna Beach, Laguna Hills, Laguna Niguel, Lake Forest, Mission Viejo, Newport Beach, Rancho Santa Margarita, San Clemente, San Juan Capistrano |
951 | Banning, Corona, Hemet, Moreno Valley, Murrieta, Norco, Perris, Riverside, Rubidoux, Temecula |
Vorwahl | Regionen |
---|
239 | Bonita Springs, Cape Coral, North Fort Myers, Golden Gate, Lehigh Acres, Naples |
305, 786, 645 | Aventura, Carol City, Coral Gables, Coral Terrace, Country Club, Cutler Ridge, Doral, Golden Glades, Hialeah, Homestead, Kendale Lakes, Kendall West, Key West, Leisure City, West Miami, North Miami Beach, Miami Lakes, Miramar, Norland, North Miami, Richmond West, Richmond Heights, South Miami Heights, Tamiami, West Little River, Westchester |
321 | Altamonte Springs, South Apopka, Casselberry, Kissimmee, West Melbourne, Merritt Island, Oak Ridge, Ocoee, Orlando, Oviedo, Palm Bay, Pine Hills, Rockledge, Sanford, Saint Cloud, Titusville, University Park, Wekiwa Springs, Winter Park, Winter Springs |
352 | Gainesville, Oakland Park, Ocala, Spring Hill |
386 | Daytona Beach, DeLand, Deltona, New Smyrna Beach, Ormond Beach, Palm Coast, Port Orange |
407, 689 | Altamonte Springs, South Apopka, Casselberry, Kissimmee, Oak Ridge, Ocoee, Orlando, Oviedo, Pine Hills, Sanford, Saint Cloud, University Park, Wekiwa Springs, Winter Park, Winter Springs |
561, 728 | Boca Del Mar, Boca Raton, Boynton Beach, Delray Beach, Jupiter, Lake Worth, Palm Beach, Riviera Beach, University Park, Wellington |
727 | Bayonet Point, Clearwater, Dunedin, Holiday, Largo, Lealman, Palm Harbor, Pinellas Park, Saint Petersburg, Tarpon Springs |
754, 954 | Coconut Creek, Cooper City, Coral Springs, Dania Beach, Davie, Deerfield Beach, Fort Lauderdale, Hallandale Beach, Hollywood, Lauderdale Lakes, Lauderhill, Margate, North Lauderdale, Pembroke Pines, Plantation, Pompano Beach, Sunrise, Tamarac, Weston |
772 | Fort Pierce South, Palm City, Port Saint Lucie, Vero Beach South |
813, 656 | Brandon, Citrus Park, Greater Northdale, Lake Magdalene, Land O' Lakes, Plant City, Tampa, Temple Terrace, Town 'n' Country |
850, 448 | Bellview, Brent, Ferry Pass, Fort Walton Beach, Panama City, West Pensacola, Tallahassee, Wright |
863 | Lakeland, Winter Haven |
904, 324 | Jacksonville, Jacksonville Beach, Lakeside |
941 | South Bradenton, North Port, Port Charlotte, Punta Gorda, Sarasota |
Vorwahl | Regionen |
---|
217, 447 | Champaign, Charleston, Danville, Decatur, Quincy, Springfield, Urbana |
224, 847 | Algonquin, Arlington Heights, Buffalo Grove, Carpentersville, Des Plaines, South Elgin, Elk Grove Village, Evanston, Glenview, Gurnee, Highland Park, Hoffman Estates, Lake Forest, Lake in the Hills, Libertyville, Morton Grove, Mount Prospect, Mundelein, Niles, North Chicago, Northbrook, Palatine, Park Ridge, Rolling Meadows, Round Lake Beach, Schaumburg, Skokie, Vernon Hills, Waukegan, Wheeling, Wilmette, Zion |
309, 861 | Bloomington, East Moline, East Peoria, Galesburg, Moline, Normal, Pekin, Peoria, Rock Island |
312, 773 | West Chicago |
331, 630 | Addison, North Aurora, Bartlett, Batavia, Bensenville, Bloomingdale, Bolingbrook, Carol Stream, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glendale Heights, Hanover Park, Lisle, Lombard, Naperville, Roselle, Saint Charles, Streamwood, Villa Park, West Chicago, Westmont, Wheaton, Woodridge |
618, 730 | East Alton, Belleville, Carbondale, Collinsville, East Saint Louis, Edwardsville, Granite City, O'Fallon |
708, 464 | Bellwood, Berwyn, Blue Island, Burbank, Calumet City, Chicago Heights, Cicero, Dolton, Elmwood Park, Evergreen Park, Harvey, Lansing, Maywood, Melrose Park, Oak Forest, Oak Lawn, Oak Park, Orland Park, Park Forest, South Holland, Tinley Park |
779, 815 | Belvidere, Crystal Lake, DeKalb, Freeport, Joliet, Kankakee, Loves Park, Machesney Park, McHenry, Rockford, Romeoville, Woodstock |
Vorwahl | Regionen |
---|
339, 781 | Arlington, Braintree, Burlington, Dedham, Lexington, Lynn, Malden, Marblehead, Medford, Melrose, Needham, Norwood, Randolph, Reading, Revere, Saugus, Stoneham, Wakefield, Waltham, Wellesley, Weymouth, Winchester, Woburn |
351, 978 | Beverly, Chelmsford, Danvers, Fitchburg, Gardner, Gloucester, Haverhill, Lawrence, Leominster, Lowell, Methuen, South Peabody, Salem, Wilmington |
413 | Agawam, North Chicopee, Holyoke, Northampton, Pittsfield, West Springfield, Westfield |
508, 774 | Attleboro, Barnstable, Brockton, Fall River, Framingham, Franklin, Marlborough, Milford, New Bedford, Taunton, Worcester |
617, 857 | Belmont, South Boston, Brookline, Cambridge, Chelsea, Everett, Milton, Newton, Quincy, Somerville, Watertown |
Vorwahl | Regionen |
---|
231 | Muskegon, Norton Shores, Shelby |
248, 947 | West Bloomfield Township, Farmington Hills, Ferndale, Madison Heights, Novi, Oak Park, Pontiac, Rochester Hills, Royal Oak, Southfield, Troy, Waterford |
269 | Battle Creek, Kalamazoo, Portage |
313, 679 | Allen Park, Dearborn, Dearborn Heights, Detroit, Hamtramck, Inkster, Lincoln Park, Redford, Taylor |
517 | Adrian, Clinton, East Lansing, Jackson, Lansing, Okemos |
586 | Clinton, Eastpointe, Roseville, Shelby, Saint Clair Shores, Sterling Heights, Warren |
616 | Forest Hills, Grand Rapids, Holland, Kentwood, Walker, WY |
734 | Ann Arbor, Canton, Garden City, Livonia, South Monroe, Plymouth, Romulus, Southgate, Westland, Wyandotte, Ypsilanti |
810 | Burton, Flint, Port Huron |
989 | Bay City, Midland, Mount Pleasant, Saginaw |
Vorwahl | Regionen |
---|
201, 551 | Bayonne, Bergenfield, Cliffside Park, Englewood, Fair Lawn, Fort Lee, Hackensack, Hoboken, Jersey City, Kearny, North Bergen, Paramus, Ridgewood, Teaneck, Union City, West New York |
609, 640 | Atlantic City, Ewing, Trenton, Willingboro |
732, 848 | Carteret, East Brunswick, Edison, Lakewood, West Long Branch, New Brunswick, North Plainfield, South Old Bridge, Perth Amboy, Rahway, Sayreville, Somerset, Toms River |
856 | Bridgeton, Camden, Cherry Hill, Millville, Pennsauken, Vineland, Willingboro |
862 | Belleville, Bloomfield, Clifton, East Orange, Garfield, Hillside, Irvington, Kearny, Livingston, Lodi, Maplewood, Montclair, Morristown, Newark, Nutley, West Orange, Passaic, Paterson, Wayne, West Milford |
908 | Cranford, Elizabeth, Hillside, Linden, South Plainfield, Roselle, Scotch Plains, Summit, Union City, Westfield |
973 | Belleville, Bloomfield, Clifton, East Orange, Garfield, Irvington, Livingston, Lodi, Maplewood, Montclair, Morristown, Newark, Nutley, West Orange, Passaic, Paterson, Wayne, West Milford |
Vorwahl | Regionen |
---|
212, 332, 646 | New York City |
315, 680 | Auburn, Rome, Syracuse, Utica, Watertown |
347, 718, 929 | The Bronx, Brooklyn, New York City, Borough of Queens, Staten Island |
516, 363 | Baldwin, East Meadow, Elmont, Franklin Square, Freeport, Garden City, Glen Cove, West Hempstead, Hicksville, Levittown, Long Beach, North Massapequa, North Merrick, North Bellmore, Oceanside, Plainview, Rockville Centre, Uniondale, Valley Stream |
518, 838 | West Albany, Rotterdam, Saratoga Springs, Schenectady, Troy |
585 | Brighton, Irondequoit, Rochester |
607 | Binghamton, Elmira, Ithaca |
631, 934 | North Bay Shore, Brentwood, Centereach, Central Islip, Commack, Copiague, Coram, Deer Park, Dix Hills, East Northport, East Patchogue, Hauppauge, Holbrook, Huntington Station, West Islip, North Lindenhurst, Medford, Ronkonkoma, Selden, Shirley, Smithtown, West Babylon |
716, 624 | Buffalo, Cheektowaga, Jamestown, South Lockport, Niagara Falls, North Tonawanda, Tonawanda, West Seneca |
845, 329 | Kingston, Middletown, New City, Newburgh, Poughkeepsie, Spring Valley |
914 | Harrison, Mount Vernon, New Rochelle, Ossining, Peekskill, Port Chester, White Plains, Yonkers |
917 | The Bronx, Brooklyn, New York City, Borough of Queens, Staten Island |
Vorwahl | Regionen |
---|
216 | Brook Park, East Cleveland, Cleveland Heights, South Euclid, Garfield Heights, Lakewood, Maple Heights, Parma, Shaker Heights |
220, 740 | Athens, Chillicothe, DE, Lancaster, Marion, Newark, Portsmouth, Zanesville |
234, 330 | Akron, Alliance, Austintown, Barberton, Boardman, Brunswick, North Canton, Cuyahoga Falls, Green, Hudson, Kent, Massillon, Medina, Niles, Stow, Warren, Wooster, Youngstown |
419, 567 | Ashland, Bowling Green, Findlay, Lima, Mansfield, Sandusky, Toledo |
440 | Ashtabula, Eastlake, Elyria, Lorain, Mentor, North Olmsted, North Ridgeville, North Royalton, Parma, Parma Heights, Rocky River, Solon, Strongsville, Westlake, Willoughby |
513, 283 | Cincinnati, Fairfield, Hamilton, Mason, Middletown, Norwood, Oxford |
614, 380 | Columbus, Dublin, Gahanna, Grove City, Hilliard, Reynoldsburg, Upper Arlington, Westerville |
937, 326 | Beavercreek, Centerville, Dayton, Fairborn, Huber Heights, Kettering, Piqua, Riverside, Sidney, Springfield, Trotwood, Troy, Xenia |
Vorwahl | Regionen |
---|
210, 726 | San Antonio |
254 | Copperas Cove, Fort Hood, Killeen, Temple, Waco |
281, 346, 713, 832 | Alvin, Atascocita, Baytown, Channelview, Cloverleaf, Deer Park, Friendswood, South Houston, La Porte, League City, Mission Bend, Missouri City, Pasadena, Pearland, Rosenberg, Spring, Sugar Land, The Woodlands |
325 | Abilene, San Angelo |
361 | Corpus Christi, Kingsville, Victoria |
409 | Beaumont, Galveston, Port Arthur, Texas City |
432 | Big Spring, Midland, West Odessa |
469, 945, 214 | Dallas metropolitan area |
512, 737 | Austin, Cedar Park, Georgetown, Round Rock, San Marcos |
682, 817 | Arlington, Bedford, Benbrook, Burleson, Cleburne, Euless, Fort Worth, Grapevine, Haltom City, Hurst, Keller, Mansfield, North Richland Hills, Southlake, Watauga |
806 | Amarillo, Lubbock, Plainview |
830 | Del Rio, Eagle Pass, Kerrville, New Braunfels, Seguin |
903 | Corsicana, Denison, Greenville, Longview, Marshall, Paris, Sherman, Texarkana, Tyler |
915 | El Paso, Socorro |
936 | Conroe, Huntsville, Lufkin, Nacogdoches |
940 | Denton, Lewisville, Wichita Falls |
956 | Brownsville, Edinburg, Harlingen, Laredo, McAllen, Mission, Pharr, San Benito, San Juan, Weslaco |
972 | Allen, Carrollton, Cedar Hill, Coppell, Dallas, DeSoto, Duncanville, Farmers Branch, Flower Mound, Frisco, Garland, Grand Prairie, Irving, Lancaster, Lewisville, McKinney, Mesquite, Plano, Richardson, Rowlett, The Colony, University Park, Waxahachie |
979 | Bryan, College Station, Lake Jackson |