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Area Codes

A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined in each of administrative regions of the public switched telephone network (PSTN) and they are also present in private telephone networks. For public number systems, geographic location plays a role in the sequence of numbers assigned to each telephone subscriber.

Numbering plans may follow a variety of design strategies which have often arisen from the historical evolution of individual telephone networks and local requirements. A broad division is commonly recognized, distinguishing open numbering plans and closed numbering plans. Many numbering plans subdivide their territory of service into geographic regions designated by a prefix, often called an area code or city code, which is a set of digits forming the most-significant part of the dialing sequence to reach a telephone subscriber.

The International Telecommunication Union (ITU) has established a comprehensive numbering plan, designated E.164, for uniform interoperability of the networks of its member state or regional administrations. It is an open numbering plan, however, imposing a maximum length of 15 digits to telephone numbers. The standard defines a country calling code (country code) for each state or region which is prefixed to each national numbering plan telephone number for international destination routing.

Private numbering plans exist in telephone networks that are privately operated in an enterprise or organizational campus. Such systems may be supported by a private branch exchange (PBX), which controls internal communications between telephone extensions.

In contrast to numbering plans, which determine telephone numbers assigned to subscriber stations, dialing plans establish the customer dialing procedures, i.e. the sequence of digits required to reach a destination. Even in closed numbering plans, it is not always necessary to dial all digits of a number. For example, an area code may often be omitted when the destination is in the same area as the v station.

The North American Numbering Plan is a closed numbering plan (i.e., it has fixed number of digits), which prescribes ten digits for each complete destination routing code, including a three-digit area code followed by a three-digit exchange and then four more digits. In the United States and Canada, area codes were first allocated in 1947. In some large cities they were used soon after as operator routing codes for connecting long-distance telephone calls between toll switching centers. The first customer-dialed long-distance calls were possible in Englewood, NJ in 1951. By ca. 1966, the system was implemented fully in both countries and users of the telephone system needed to learn their own area code. The Bell System organized the numbering plan to minimize the cost of providing automatic dialing to large population centers, as calls that crossed area code boundaries were required to be switched by special toll switching systems. For example, geographic areas were designed so that tributary routes were placed into the same area as the major toll center. Due to a technical limitation of the numbering plan, states that were anticipated to require more than about 500 central offices were split into multiple areas, each receiving a code with the middle digit being 1. On the other hand, area codes that covered an entire state had the digit 0 in the middle. In contrast to the area code, the second digit of the three-digit exchange code was never 0 or 1, thus affording a simple rule for recognition of whether a user was dialing a full ten-digit telephone number or merely dialing within the local area code using seven-digit dialing. Toll operators were able to differentiate between the two types of areas from the middle digit of the area code when a routing operator had to be consulted

Prefix State Major City Time Zone
201New JerseyJersey CityEastern (07:18AM)
202Washington, DCWashingtonEastern (07:18AM)
203ConnecticutBridgeportEastern (07:18AM)
204ManitobaWinnipeg, MBCentral (06:18AM)
205AlabamaBirminghamEastern (07:18AM)
206WashingtonSeattleEastern (07:18AM)
207MainePortlandEastern (07:18AM)
208IdahoBoise CityMountain / Pacific (05:18AM 04:18AM)
209CaliforniaStocktonPacific (04:18AM)
210TexasSan AntonioCentral (06:18AM)
212New YorkNew YorkEastern (07:18AM)
213CaliforniaLos AngelesPacific (04:18AM)
214TexasDallasCentral (06:18AM)
215PennsylvaniaPhiladelphiaEastern (07:18AM)
216OhioClevelandEastern (07:18AM)
217IllinoisSpringfieldCentral (06:18AM)
218MinnesotaDuluthCentral (06:18AM)
219IndianaHammondEastern / Central (07:18AM 06:18AM)
220OhioNewarkEastern (07:18AM)
224IllinoisElginCentral (06:18AM)
225LouisianaBaton RougeCentral (06:18AM)
226LondonLondon, ONEastern (07:18AM)
228MississippiGulfportCentral (06:18AM)
229GeorgiaAlbanyEastern (07:18AM)
231MichiganMuskegonEastern (07:18AM)
234OhioAkronEastern (07:18AM)
236VancouverVancouver, BCPacific (04:18AM)
239FloridaCape CoralEastern (07:18AM)
240MarylandGermantownEastern (07:18AM)
248MichiganTroyEastern (07:18AM)
249SudburySudbury, ONEastern (07:18AM)
250KelownaKelowna, BCPacific (04:18AM)
251AlabamaMobileCentral (06:18AM)
252North CarolinaGreenvilleEastern (07:18AM)
253WashingtonTacomaPacific (04:18AM)
254TexasKilleenCentral (06:18AM)
256AlabamaHuntsvilleCentral (06:18AM)
260IndianaFort WayneEastern (07:18AM)
262WisconsinKenoshaCentral (06:18AM)
267PennsylvaniaPhiladelphiaEastern (07:18AM)
269MichiganKalamazooEastern (07:18AM)
270KentuckyBowling GreenEastern / Central (07:18AM 06:18AM)
272PennsylvaniaScrantonEastern (07:18AM)
276VirginiaBristolEastern (07:18AM)
281TexasHoustonCentral (06:18AM)
289HamiltonHamilton, ONEastern (07:18AM)
301MarylandGermantownEastern (07:18AM)
302DelawareWilmingtonEastern (07:18AM)
303ColoradoDenverMountain (05:18AM)
304West VirginiaCharlestonEastern (07:18AM)
305FloridaMiamiEastern (07:18AM)
306SaskatchewanSaskatoon, SK(UTC-6) (06:18PM)
307WyomingCheyenneMountain (05:18AM)
308NebraskaGrand IslandCentral / Mountain (06:18AM 05:18AM)
309IllinoisPeoriaCentral (06:18AM)
310CaliforniaLos AngelesPacific (04:18AM)
312IllinoisChicagoCentral (06:18AM)
313MichiganDetroitEastern (07:18AM)
314MissouriSt. LouisCentral (06:18AM)
315New YorkSyracuseEastern (07:18AM)
316KansasWichitaCentral (06:18AM)
317IndianaIndianapolis city (balance)Eastern (07:18AM)
318LouisianaShreveportCentral (06:18AM)
319IowaCedar RapidsCentral (06:18AM)
320MinnesotaSt. CloudCentral (06:18AM)
321FloridaOrlandoEastern (07:18AM)
323CaliforniaLos AngelesPacific (04:18AM)
325TexasAbileneCentral (06:18AM)
330OhioAkronEastern (07:18AM)
331IllinoisAuroraCentral (06:18AM)
332New YorkNew YorkEastern (07:18AM)
334AlabamaMontgomeryCentral (06:18AM)
336North CarolinaGreensboroEastern (07:18AM)
337LouisianaLafayetteCentral (06:18AM)
339MassachusettsBostonEastern (07:18AM)
340Virgin IslandsSt. Croix(UTC-4) (04:18PM)
343OttawaOttawa, ONEastern (07:18AM)
346TexasHoustonCentral (06:18AM)
347New YorkNew YorkEastern (07:18AM)
351MassachusettsLowellEastern (07:18AM)
352FloridaGainesvilleEastern (07:18AM)
360WashingtonVancouverPacific (04:18AM)
361TexasCorpus ChristiCentral (06:18AM)
364KentuckyBowling GreenEastern / Central (07:18AM 06:18AM)
365HamiltonHamilton, ONEastern (07:18AM)
380OhioColumbusEastern (07:18AM)
385UtahSalt Lake CityMountain (05:18AM)
386FloridaPalm CoastEastern (07:18AM)
401Rhode IslandProvidenceEastern (07:18AM)
402NebraskaOmahaCentral (06:18AM)
403CalgaryCalgary, ABMountain (05:18AM)
404GeorgiaAtlantaEastern (07:18AM)
405OklahomaOklahoma CityCentral (06:18AM)
406MontanaBillingsMountain (05:18AM)
407FloridaOrlandoEastern (07:18AM)
408CaliforniaSan JosePacific (04:18AM)
409TexasBeaumontCentral (06:18AM)
410MarylandBaltimoreEastern (07:18AM)
412PennsylvaniaPittsburghEastern (07:18AM)
413MassachusettsSpringfieldEastern (07:18AM)
414WisconsinMilwaukeeCentral (06:18AM)
415CaliforniaSan FranciscoPacific (04:18AM)
416TorontoToronto, ONEastern (07:18AM)
417MissouriSpringfieldCentral (06:18AM)
418QuebecQuebec, QCEastern (07:18AM)
419OhioToledoEastern (07:18AM)
423TennesseeChattanoogaEastern / Central (07:18AM 06:18AM)
424CaliforniaLos AngelesPacific (04:18AM)
425WashingtonBellevuePacific (04:18AM)
430TexasTylerCentral (06:18AM)
431ManitobaWinnipeg, MBCentral (06:18AM)
432TexasMidlandCentral (06:18AM)
434VirginiaLynchburgEastern (07:18AM)
435UtahSt. GeorgeMountain (05:18AM)
437TorontoToronto, ONEastern (07:18AM)
438MontrealMontreal, QCEastern (07:18AM)
440OhioParmaEastern (07:18AM)
442CaliforniaOceansidePacific (04:18AM)
443MarylandBaltimoreEastern (07:18AM)
450GranbyGranby, QCEastern (07:18AM)
458OregonEugeneMountain / Pacific (05:18AM 04:18AM)
463IndianaIndianapolis city (balance)Eastern (07:18AM)
469TexasDallasCentral (06:18AM)
470GeorgiaAtlantaEastern (07:18AM)
475ConnecticutBridgeportEastern (07:18AM)
478GeorgiaMaconEastern (07:18AM)
479ArkansasFort SmithCentral (06:18AM)
480ArizonaMesa(UTC-7) (07:18PM)
484PennsylvaniaAllentownEastern (07:18AM)
501ArkansasLittle RockCentral (06:18AM)
502KentuckyLouisvilleEastern (07:18AM)
503OregonPortlandPacific (04:18AM)
504LouisianaNew OrleansCentral (06:18AM)
505New MexicoAlbuquerqueMountain (05:18AM)
506New BrunswickMoncton, NBAtlantic (08:18AM)
507MinnesotaRochesterCentral (06:18AM)
508MassachusettsWorcesterEastern (07:18AM)
509WashingtonSpokanePacific (04:18AM)
510CaliforniaOaklandPacific (04:18AM)
512TexasAustinCentral (06:18AM)
513OhioCincinnatiEastern (07:18AM)
514MontrealMontreal, QCEastern (07:18AM)
515IowaDes MoinesCentral (06:18AM)
516New YorkHempsteadEastern (07:18AM)
517MichiganLansingEastern (07:18AM)
518New YorkAlbanyEastern (07:18AM)
519LondonLondon, ONEastern (07:18AM)
520ArizonaTucson(UTC-7) (07:18PM)
530CaliforniaReddingPacific (04:18AM)
531NebraskaOmahaCentral (06:18AM)
534WisconsinEau ClaireCentral (06:18AM)
539OklahomaTulsaCentral (06:18AM)
540VirginiaRoanokeEastern (07:18AM)
541OregonEugeneMountain / Pacific (05:18AM 04:18AM)
548LondonLondon, ONEastern (07:18AM)
551New JerseyJersey CityEastern (07:18AM)
559CaliforniaFresnoPacific (04:18AM)
561FloridaWest Palm BeachEastern (07:18AM)
562CaliforniaLong BeachPacific (04:18AM)
563IowaDavenportCentral (06:18AM)
567OhioToledoEastern (07:18AM)
570PennsylvaniaScrantonEastern (07:18AM)
571VirginiaArlingtonEastern (07:18AM)
573MissouriColumbiaCentral (06:18AM)
574IndianaSouth BendEastern / Central (07:18AM 06:18AM)
575New MexicoLas CrucesMountain (05:18AM)
579GranbyGranby, QCPacific (04:18AM)
580OklahomaLawtonCentral (06:18AM)
581QuebecQuebec, QCEastern (07:18AM)
585New YorkRochesterEastern (07:18AM)
586MichiganWarrenEastern (07:18AM)
587CalgaryCalgary, ABMountain (05:18AM)
601MississippiJacksonCentral (06:18AM)
602ArizonaPhoenix(UTC-7) (07:18PM)
603New HampshireManchesterEastern (07:18AM)
604VancouverVancouver, BCPacific (04:18AM)
605South DakotaSioux FallsCentral / Mountain (06:18AM 05:18AM)
606KentuckyAshlandEastern / Central (07:18AM 06:18AM)
607New YorkBinghamtonEastern (07:18AM)
608WisconsinMadisonCentral (06:18AM)
609New JerseyTrentonEastern (07:18AM)
610PennsylvaniaAllentownEastern (07:18AM)
612MinnesotaMinneapolisCentral (06:18AM)
613OttawaOttawa, ONEastern (07:18AM)
614OhioColumbusEastern (07:18AM)
615TennesseeNashvilleCentral (06:18AM)
616MichiganGrand RapidsEastern (07:18AM)
617MassachusettsBostonEastern (07:18AM)
618IllinoisBellevilleCentral (06:18AM)
619CaliforniaSan DiegoPacific (04:18AM)
620KansasHutchinsonCentral / Mountain (06:18AM 05:18AM)
623ArizonaPhoenix(UTC-7) (07:18PM)
626CaliforniaPasadenaPacific (04:18AM)
628CaliforniaSan FranciscoPacific (04:18AM)
629TennesseeNashvilleCentral (06:18AM)
630IllinoisAuroraCentral (06:18AM)
631New YorkBrentwoodEastern (07:18AM)
636MissouriO'FallonCentral (06:18AM)
639SaskatchewanSaskatoon, SK(UTC-6) (06:18PM)
641IowaMason CityCentral (06:18AM)
646New YorkNew YorkEastern (07:18AM)
647TorontoToronto, ONEastern (07:18AM)
650CaliforniaSan MateoPacific (04:18AM)
651MinnesotaSt. PaulCentral (06:18AM)
657CaliforniaAnaheimPacific (04:18AM)
660MissouriSedaliaCentral (06:18AM)
661CaliforniaBakersfieldPacific (04:18AM)
662MississippiSouthavenCentral (06:18AM)
667MarylandBaltimoreEastern (07:18AM)
669CaliforniaSan JosePacific (04:18AM)
670Northern Mariana IslandsSaipan(UTC+10) (02:18AM)
671GuamDededo(UTC+10) (02:18AM)
678GeorgiaAtlantaEastern (07:18AM)
680New YorkSyracuseEastern (07:18AM)
681West VirginiaCharlestonEastern (07:18AM)
682TexasFort WorthCentral (06:18AM)
684American SamoaPago Pago(UTC-11) (11:18PM)
701North DakotaFargoCentral / Mountain (06:18AM 05:18AM)
702NevadaLas VegasPacific (04:18AM)
703VirginiaArlingtonEastern (07:18AM)
704North CarolinaCharlotteEastern (07:18AM)
705SudburySudbury, ONEastern (07:18AM)
706GeorgiaAugustaEastern (07:18AM)
707CaliforniaSanta RosaPacific (04:18AM)
708IllinoisCiceroCentral (06:18AM)
709Newfoundland/LabradorSt. Johns, NLNewfoundland (08:48AM)
712IowaSioux CityCentral (06:18AM)
713TexasHoustonCentral (06:18AM)
714CaliforniaAnaheimPacific (04:18AM)
715WisconsinEau ClaireCentral (06:18AM)
716New YorkBuffaloEastern (07:18AM)
717PennsylvaniaLancasterEastern (07:18AM)
718New YorkNew YorkEastern (07:18AM)
719ColoradoColorado SpringsMountain (05:18AM)
720ColoradoDenverMountain (05:18AM)
724PennsylvaniaNew CastleEastern (07:18AM)
725NevadaLas VegasPacific (04:18AM)
727FloridaSt. PetersburgEastern (07:18AM)
731TennesseeJacksonCentral (06:18AM)
732New JerseyToms RiverEastern (07:18AM)
734MichiganAnn ArborEastern (07:18AM)
737TexasAustinCentral (06:18AM)
740OhioNewarkEastern (07:18AM)
743North CarolinaGreensboroEastern (07:18AM)
747CaliforniaLos AngelesPacific (04:18AM)
754FloridaFort LauderdaleEastern (07:18AM)
757VirginiaVirginia BeachEastern (07:18AM)
760CaliforniaOceansidePacific (04:18AM)
762GeorgiaAugustaEastern (07:18AM)
763MinnesotaBrooklyn ParkCentral (06:18AM)
765IndianaMuncieEastern (07:18AM)
769MississippiJacksonCentral (06:18AM)
770GeorgiaRoswellEastern (07:18AM)
772FloridaPort St. LucieEastern (07:18AM)
773IllinoisChicagoCentral (06:18AM)
774MassachusettsWorcesterEastern (07:18AM)
775NevadaRenoPacific (04:18AM)
778VancouverVancouver, BCPacific (04:18AM)
779IllinoisRockfordCentral (06:18AM)
780EdmontonEdmonton, ABMountain (05:18AM)
781MassachusettsBostonEastern (07:18AM)
782Nova Scotia/PE IslandHalifax, NSAtlantic (08:18AM)
785KansasTopekaCentral / Mountain (06:18AM 05:18AM)
786FloridaMiamiEastern (07:18AM)
787Puerto RicoSan Juan(UTC-4) (04:18PM)
801UtahSalt Lake CityMountain (05:18AM)
802VermontBurlingtonEastern (07:18AM)
803South CarolinaColumbiaEastern (07:18AM)
804VirginiaRichmondEastern (07:18AM)
805CaliforniaOxnardPacific (04:18AM)
806TexasLubbockCentral (06:18AM)
807KenoraKenora, ONEastern / Central (07:18AM 06:18AM)
808HawaiiUrban Honolulu(UTC-10) (10:18PM)
810MichiganFlintEastern (07:18AM)
812IndianaEvansvilleEastern / Central (07:18AM 06:18AM)
813FloridaTampaEastern (07:18AM)
814PennsylvaniaErieEastern (07:18AM)
815IllinoisRockfordCentral (06:18AM)
816MissouriKansas CityCentral (06:18AM)
817TexasFort WorthCentral (06:18AM)
818CaliforniaLos AngelesPacific (04:18AM)
819SherbrookeSherbrooke, QCEastern (07:18AM)
825CalgaryCalgary, ABMountain (05:18AM)
828North CarolinaAshevilleEastern (07:18AM)
830TexasNew BraunfelsCentral (06:18AM)
831CaliforniaSalinasPacific (04:18AM)
832TexasHoustonCentral (06:18AM)
843South CarolinaCharlestonEastern (07:18AM)
845New YorkNew CityEastern (07:18AM)
847IllinoisElginCentral (06:18AM)
848New JerseyToms RiverEastern (07:18AM)
850FloridaTallahasseeEastern / Central (07:18AM 06:18AM)
854South CarolinaCharlestonEastern (07:18AM)
856New JerseyCamdenEastern (07:18AM)
857MassachusettsBostonEastern (07:18AM)
858CaliforniaSan DiegoPacific (04:18AM)
859KentuckyLexington-FayetteEastern (07:18AM)
860ConnecticutHartfordEastern (07:18AM)
862New JerseyNewarkEastern (07:18AM)
863FloridaLakelandEastern (07:18AM)
864South CarolinaGreenvilleEastern (07:18AM)
865TennesseeKnoxvilleEastern (07:18AM)
867Northern CanadaWhitehorse, YTCentral / Mountain / Pacific (06:18AM 05:18AM 04:18AM)
870ArkansasJonesboroCentral (06:18AM)
872IllinoisChicagoCentral (06:18AM)
873SherbrookeSherbrooke, QCEastern (07:18AM)
878PennsylvaniaPittsburghEastern (07:18AM)
901TennesseeMemphisCentral (06:18AM)
902Nova Scotia/PE IslandHalifax, NSAtlantic (08:18AM)
903TexasTylerCentral (06:18AM)
904FloridaJacksonvilleEastern (07:18AM)
905HamiltonHamilton, ONEastern (07:18AM)
906MichiganMarquetteEastern / Central (07:18AM 06:18AM)
907AlaskaAnchorage(UTC-9) (03:18AM)
908New JerseyElizabethEastern (07:18AM)
909CaliforniaSan BernardinoPacific (04:18AM)
910North CarolinaFayettevilleEastern (07:18AM)
912GeorgiaSavannahEastern (07:18AM)
913KansasOverland ParkCentral (06:18AM)
914New YorkYonkersEastern (07:18AM)
915TexasEl PasoCentral / Mountain (06:18AM 05:18AM)
916CaliforniaSacramentoPacific (04:18AM)
917New YorkNew YorkEastern (07:18AM)
918OklahomaTulsaCentral (06:18AM)
919North CarolinaRaleighEastern (07:18AM)
920WisconsinGreen BayCentral (06:18AM)
925CaliforniaConcordPacific (04:18AM)
928ArizonaYuma(UTC-7) (07:18PM)
929New YorkNew YorkEastern (07:18AM)
930IndianaEvansvilleEastern / Central (07:18AM 06:18AM)
931TennesseeClarksvilleEastern / Central (07:18AM 06:18AM)
934New YorkBrentwoodEastern (07:18AM)
936TexasConroeCentral (06:18AM)
937OhioDaytonEastern (07:18AM)
938AlabamaHuntsvilleCentral (06:18AM)
939Puerto RicoSan Juan(UTC-4) (04:18PM)
940TexasDentonCentral (06:18AM)
941FloridaNorth PortEastern (07:18AM)
947MichiganTroyEastern (07:18AM)
949CaliforniaIrvinePacific (04:18AM)
951CaliforniaRiversidePacific (04:18AM)
952MinnesotaBloomingtonCentral (06:18AM)
954FloridaFort LauderdaleEastern (07:18AM)
956TexasLaredoCentral (06:18AM)
959ConnecticutHartfordEastern (07:18AM)
970ColoradoFort CollinsMountain (05:18AM)
971OregonPortlandPacific (04:18AM)
972TexasDallasCentral (06:18AM)
973New JerseyNewarkEastern (07:18AM)
978MassachusettsLowellEastern (07:18AM)
979TexasCollege StationCentral (06:18AM)
980North CarolinaCharlotteEastern (07:18AM)
984North CarolinaRaleighEastern (07:18AM)
985LouisianaHoumaCentral (06:18AM)
989MichiganSaginawEastern (07:18AM)