Several sets of codes and abbreviations are used to represent the political divisions of the United States for postal addresses, data processing, general abbreviations, and other purposes.

Table

This table includes abbreviations for three independent countries related to the United States through Compacts of Free Association, and other comparable postal abbreviations, including those now obsolete.

Codes and abbreviations for U.S. states, federal district, territories, and other regions
Codes:
    ISOISO 3166 codes (2-letter, 3-letter, and 3-digit codes from ISO 3166-1; 2+2-letter codes from ISO 3166-2)
    ANSI2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2)
    USPS2-letter codes used by the United States Postal Service
    USCG2-letter codes used by the United States Coast Guard (bold red text shows differences between ANSI and USCG)
Abbreviations:
    GPOOlder variable-length official US Government Printing Office abbreviations
    APAbbreviations from the AP Stylebook (bold red text shows differences between GPO and AP)
Name and status of region ISO ANSI USPS USCG GPO AP Other
abbreviations
 
United States of AmericaFederal stateUS
USA
840		US00U.S.U.S.U.S.A.
AlabamaStateUS-ALAL01ALALAla.Ala.
AlaskaStateUS-AKAK02AKAKAlaskaAlaskaAk.[1]
ArizonaStateUS-AZAZ04AZAZAriz.Ariz.
ArkansasStateUS-ARAR05ARARArk.Ark.
CaliforniaStateUS-CACA06CACFCalif.Calif.Cal.
ColoradoStateUS-COCO08COCLColo.Colo.
ConnecticutStateUS-CTCT09CTCTConn.Conn.
DelawareStateUS-DEDE10DEDLDel.Del.
District of ColumbiaFederal districtUS-DCDC11DCDCD.C.D.C.Dis. Col.[2]
FloridaStateUS-FLFL12FLFLFla.Fla.
GeorgiaStateUS-GAGA13GAGAGa.Ga.Geo.[1]
HawaiiStateUS-HIHI15HIHAHawaiiHawaiiHi.;[1] Haw.
IdahoStateUS-IDID16IDIDIdahoIdahoIda.[1]
IllinoisStateUS-ILIL17ILILIll.Ill.
IndianaStateUS-ININ18ININInd.Ind.
IowaStateUS-IAIA19IAIAIowaIowaIoa.[lower-alpha 1]
KansasStateUS-KSKS20KSKAKans.Kan.Ka.
KentuckyStateUS-KYKY21KYKYKy.Ky.Ken., Kent.[lower-alpha 2]
LouisianaStateUS-LALA22LALALa.La.
MaineStateUS-MEME23MEMEMaineMaine
MarylandStateUS-MDMD24MDMDMd.Md.Mar., Mary.
MassachusettsStateUS-MAMA25MAMSMass.Mass.
MichiganStateUS-MIMI26MIMCMich.Mich.
MinnesotaStateUS-MNMN27MNMNMinn.Minn.
MississippiStateUS-MSMS28MSMIMiss.Miss.
MissouriStateUS-MOMO29MOMOMo.Mo.
MontanaStateUS-MTMT30MTMTMont.Mont.
NebraskaStateUS-NENE31NENBNebr.Neb.
NevadaStateUS-NVNV32NVNVNev.Nev.
New HampshireStateUS-NHNH33NHNHN.H.N.H.
New JerseyStateUS-NJNJ34NJNJN.J.N.J.N. Jersey[2]
New MexicoStateUS-NMNM35NMNMN. Mex.N.M.New M., New Mex.
New YorkStateUS-NYNY36NYNYN.Y.N.Y.N. York[2]
North CarolinaStateUS-NCNC37NCNCN.C.N.C.N. Car.
North DakotaStateUS-NDND38NDNDN. Dak.N.D.
OhioStateUS-OHOH39OHOHOhioOhioO.,[3] Oh.[1]
OklahomaStateUS-OKOK40OKOKOkla.Okla.
OregonStateUS-OROR41OROROreg.Ore.
PennsylvaniaStateUS-PAPA42PAPAPa.Pa.Penn.,[1] Penna.[4]
Rhode IslandStateUS-RIRI44RIRIR.I.R.I.R.I. & P.P.
South CarolinaStateUS-SCSC45SCSCS.C.S.C.S. Car.
South DakotaStateUS-SDSD46SDSDS. Dak.S.D.SoDak
TennesseeStateUS-TNTN47TNTNTenn.Tenn.
TexasStateUS-TXTX48TXTXTex.Texas
UtahStateUS-UTUT49UTUTUtahUtahUt.[1]
VermontStateUS-VTVT50VTVTVt.Vt.Verm.[5]
VirginiaStateUS-VAVA51VAVAVa.Va.Virg.
WashingtonStateUS-WAWA53WAWNWash.Wash.Wn.[6]
West VirginiaStateUS-WVWV54WVWVW. Va.W.Va.W.V., W. Virg.
WisconsinStateUS-WIWI55WIWSWis.Wis.Wisc.
WyomingStateUS-WYWY56WYWYWyo.Wyo.
American SamoaInsular area (Territory)AS
ASM
016
US-AS		AS60ASASA.S.
GuamInsular area (Territory)GU
GUM
316
US-GU		GU66GUGUGuam
Northern Mariana IslandsInsular area (Commonwealth)MP
MNP
580
US-MP		MP69MPCMM.P.CNMI[7]
Puerto RicoInsular area (Commonwealth)PR
PRI
630
US-PR		PR72PRPRP.R.
U.S. Virgin IslandsInsular area (Territory)VI
VIR
850
US-VI		VI78VIVIV.I.U.S.V.I.
U.S. Minor Outlying IslandsInsular areasUM
UMI
581
US-UM		UM74UM
Baker IslandIslandUM-8181XB[8]
Howland IslandIslandUM-8484XH[8]
Jarvis IslandIslandUM-8686XQ[8]
Johnston AtollAtollUM-6767XU[8]
Kingman ReefAtollUM-8989XM[8]
Midway IslandsAtollUM-7171QM[8]
Navassa IslandIslandUM-7676XV[8]
Palmyra Atoll[lower-alpha 3]Atoll[lower-alpha 3]UM-9595XL[8]
Wake IslandAtollUM-7979QW[8]
Marshall IslandsFreely associated stateMH
MHL
584		MH68MH
MicronesiaFreely associated stateFM
FSM
583		FM64FM
PalauFreely associated statePW
PLW
585		PW70PW
U.S. Armed Forces – Americas[lower-alpha 4]US military mail codeAA
U.S. Armed Forces – Europe[lower-alpha 5]US military mail codeAE
U.S. Armed Forces – Pacific[lower-alpha 6]US military mail codeAP
NebraskaObsolete postal code[lower-alpha 7]NB
Northern Mariana IslandsObsolete postal code[lower-alpha 8]CM
Panama Canal ZoneObsolete postal codePZ
PCZ
594		CZ
Philippine IslandsObsolete postal codePH
PHL
608[9]		PI
Trust Territory of the Pacific IslandsObsolete postal codePC
PCI
582		TT

History

As early as October 1831, the United States Post Office recognized common abbreviations for states and territories. However, they accepted these abbreviations only because of their popularity, preferring that patrons spell names out in full to avoid confusion.[3]

The traditional abbreviations for U.S. states and territories, widely used in mailing addresses prior to the introduction of two-letter U.S. postal abbreviations, are still commonly used for other purposes (such as legal citation), and are still recognized (though discouraged) by the Postal Service.[10]

Modern two-letter abbreviated codes for the states and territories originated in October 1963, with the issuance of Publication 59: Abbreviations for Use with ZIP Code, three months after the Post Office introduced ZIP codes in July 1963. The purpose, rather than to standardize state abbreviations per se, was to make room in a line of no more than 23 characters for the city, the state, and the ZIP code.[3]

Since 1963, only one state abbreviation has changed. Originally Nebraska was "NB"; but, in November 1969, the Post Office changed it to "NE" to avoid confusion with New Brunswick in Canada.[3]

Prior to 1987, when the U.S. Secretary of Commerce approved the two-letter codes for use in government documents,[11] the United States Government Printing Office (GPO) suggested its own set of abbreviations, with some states left unabbreviated. Today, the GPO supports United States Postal Service standard.[12]

Current use of traditional abbreviations

Legal citation manuals, such as The Bluebook and The ALWD Citation Manual, typically use the "traditional abbreviations" or variants thereof.

Codes for states and territories

ISO standard 3166

ANSI standard INCITS 38:2009

The American National Standards Institute (ANSI) established alphabetic and numeric codes for each state and outlying areas in ANSI standard INCITS 38:2009. ANSI standard INCITS 38:2009 replaced the Federal Information Processing Standard (FIPS) standards FIPS 5-2, FIPS 6-4, and FIPS 10-4. The ANSI alphabetic state code is the same as the USPS state code except for U.S. Minor Outlying Islands, which have an ANSI code "UM" but no USPS code—and U.S. Military Mail locations, which have USPS codes ("AA", "AE", "AP") but no ANSI code.

Postal codes

The United States Postal Service (USPS) has established a set of uppercase abbreviations to help process mail with optical character recognition and other automated equipment.[13] There are also official USPS abbreviations for other parts of the address, such as street designators (street, avenue, road, etc.).

These two-letter codes are distinguished from traditional abbreviations such as Calif., Fla., or Tex. The Associated Press Stylebook states that in contexts other than mailing addresses, the traditional state abbreviations should be used.[14] However, the Chicago Manual of Style now recommends use of the uppercase two-letter abbreviations, with the traditional forms as an option.[15]

The postal abbreviation is the same as the ISO 3166-2 subdivision code for each of the fifty states.

These codes do not overlap with the 13 Canadian subnational postal abbreviations. The code for Nebraska changed from NB to NE in November 1969 to avoid a conflict with New Brunswick.[3] Canada likewise chose MB for Manitoba to prevent conflict with either Massachusetts (MA), Michigan (MI), Minnesota (MN), Missouri (MO), or Montana (MT).

Coast Guard vessel prefixes

The U.S. Coast Guard (USCG) uses a set of two-letter prefixes for vessel numbers;[16] 39 states and the District of Columbia have the same USPS and USCG abbreviations. USCG prefixes have also been established for five outlying territories; all are the same as the USPS abbreviations except the Mariana Islands. The twelve cases where USPS and USCG abbreviations differ are listed below and marked in bold red in the table above; they include three inland states with a small Coast Guard contingent. These twelve abbreviations were changed to avoid conflicting with the ISO 3166 two-digit country codes.

Mismatches between USPS and USCG codes
California Colorado Delaware Hawaii Kansas Michigan Mississippi Massachusetts Nebraska Washington Wisconsin Mariana Islands
USPS CA CO DE HI KS MI MS MA NE WA WI MP
USCG CF CL DL HA KA MC MI MS NB WN WS CM

See also

Notes

  1. ↑ "Ioa." or (more typically) "IOA" found in Iowa post office cancellations from the 1870s.
  2. ↑ Not to be confused with Kent, England
  3. 1 2 The Palmyra Atoll is an unorganized incorporated territory of the United States that was previously a part of the Territory of Hawaii.
  4. ↑ The U.S. Armed Forces – Americas include the Caribbean Sea and exclude the United States, Canada, and Greenland.
  5. ↑ The U.S. Armed Forces – Europe include the Atlantic Ocean, the Mediterranean Sea, Canada, Greenland, Africa, and Southwest Asia.
  6. ↑ The U.S. Armed Forces – Pacific include the Indian Ocean, Oceania, and Asia except Southwest Asia.
  7. ↑ Former USPS code "NB" for Nebraska is now obsolete; it was changed to NE in November 1969 to avoid confusion with New Brunswick, Canada.
  8. ↑ Former USPS code "CM" for the Commonwealth of the Northern Mariana Islands is now obsolete; it was changed to MP in 1988 to match ISO 3166-1.

References

  1. 1 2 3 4 5 6 7 Consolidated Listing of FAA Certificated Repair Stations. U.S. Dept. of Transportation. December 9, 1970. Retrieved March 12, 2020.
  2. 1 2 3 Register of the Commissioned and Warrant Officers of the Navy of the United States. Washington, D.C.: [U.S.] Government Printing Office. January 1, 1863. Retrieved March 12, 2020.
  3. 1 2 3 4 5 USPS Postal History: State Abbreviations Accessed November 7, 2011.
  4. ↑ Arthur, Andy. "Penna. the Abbreviation". AndyArthur.org. Retrieved February 15, 2021.
  5. ↑ Fisher, Richard S. (1857). A new and complete statistical gazetteer of the United States of America. J. H. Colton and Company. Retrieved March 12, 2020.
  6. ↑ "search on WN". Digitum.washingtonhistory.org. Retrieved February 26, 2018.
  7. ↑ "Commonwealth of the Northern Mariana Islands". www.doi.gov. Retrieved January 7, 2018.
  8. 1 2 3 4 5 6 7 8 9 "Geopolitical Entities, Names, and Codes Standard". NSG Standards Registry. Retrieved February 6, 2017.
  9. ↑ "Philippine diplomats will now use PH or PHL instead of RP". GMA News. October 28, 2010. Retrieved March 17, 2013.
  10. ↑ "USPS Postal News, "It's Okay to Say 'I Don't Know,' So Long As You Find Out!" January 9, 2009". About.usps.com. January 9, 2009. Retrieved February 26, 2018.
  11. ↑ Hawes, Kristi G. (May 28, 1987). "Information Technology Laboratory". NIST. Archived from the original on July 5, 2009. Retrieved April 21, 2009.
  12. ↑ U.S. Government Printing Office Style Manual, 30th Edition Accessed April 21, 2009.
  13. ↑ United States Postal Service (June 2020). "Appendix B. Two–Letter State and Possession Abbreviations. Postal Addressing Standards". Postal Explorer. Retrieved January 21, 2020.
  14. ↑ Robbins, Sonia J. (January 4, 2004). "State Abbreviations". New York University. Archived from the original on April 27, 2009.
  15. ↑ Harper, Russell David, ed. (2017) [1906]. "10.27 Abbreviations for US states and territories". The Chicago manual of style (17th ed.). The University of Chicago Press. doi:10.7208/cmos17. ISBN 9780226287058. LCCN 2017020712. In bibliographies, tabular matter, lists, and mailing addresses, they are usually abbreviated. In all such contexts, Chicago prefers the two-letter postal codes to the conventional abbreviations.
  16. ↑ 33 CFR 173, App. A
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