A1 - Mississippi
B2 - Missouri
C3 - Minnesota
D4 - Michigan
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Answer: On July 1, 1963, the Post Office Department introduced the five-digit ZIP Code. To make room for the ZIP Code in the last line of an address, state names needed to be abbreviated. Previously, the Post Office Department preferred that state names be written in full to avoid confusion. The department adopted the current two-letter abbreviations in October 1963. Michigan’s postal abbreviation (MI) is not in alphabetical order. Mississippi (MS), Minnesota (MN), and Missouri (MO) all have two-letter abbreviations that are in alphabetical order.
Also -
US STATE POSTAL ABBREVIATION STANDARD ABBREVIATION
Alabama AL Ala.
Alaska AK Alaska
Arizona AZ Ariz.
Arkansas AR Ark.
California CA Calif.
Colorado CO Color.
Connecticut CT Conn.
Delaware DE Del.
Florida FL Fla.
Georgia GA Ga.
Hawaii HI Hawaii
Idaho ID Idaho
Illinois IL Ill.
Indiana IN Ind.
Iowa IA Iowa
Kansas KS Kan.
Kentucky KY Ky.
Louisiana LA La.
Maine ME Maine
Maryland MD Md.
Massachusetts MA Mass.
Michigan MI Mich.
Minnesota MN Minn.
Mississippi MS Miss.
Missouri MO Mo.
Montana MT Mont.
Nebraska NE Neb.
Nevada NV Nev.
New Hampshire NH N.H.
New Jersey NJ N.J.
New Mexico NM N.M.
New York NY N.Y.
North Carolina NC N.C.
North Dakota ND N.D.
Ohio OH Ohio
Oklahoma OK Okla.
Oregon OR Ore.
Pennsylvania PA Pa.
Rhode Island RI R.I.
South Carolina SC S.C.
South Dakota SD S.Dak.
Tennessee TN Tenn.
Texas TX Tex.
Utah UT Utah
Vermont VT V.T.
Virginia VA Va.
Washington WA Wash.
West Virginia WV W.Va.
Wisconsin WI Wis.
Wyoming WY Wyo.
Territory/Commonwealth Postal Abbreviation Standard Abbreviation
District of Columbia DC D.C.
Guam GU Guam
Marshall Islands MH M.I.
Northern Mariana Island MP CNMI
Puerto Rico PR P.R. or PUR
Virgin Islands VI V.I.
Military “State” Abbreviation
Armed Forces Africa AE
Armed Forces Americas AA
Armed Forces Canada AE
Armed Forces Europe AE
Armed Forces Middle East AE
Armed Forces Pacific AP
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