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The standard, official two letter state abbreviation for Arkansas is AR.
Note: AP Style state abbreviations differ from their corresponding US Postal Service abbreviations, are in parentheses. 1  Ala. (AL) â for Alabama. 2  Alaska (AK) â this state is not abbreviated in text. 3  Ariz. (AZ) â for Arizona. 4  Ark. (AR) â for Arkansas. 5  Calif. (CA) â for California. 6  Colo. (CO) â for Colorado. 7  Conn. (CT) â for Connecticut. 8  Del.