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All state abbreviations

What state is OK?

OK = Oklahoma

OK is the official two-letter USPS postal abbreviation for Oklahoma. The capital is Oklahoma City, and Oklahoma is in the South region. See the full Oklahoma profile for borders, nickname, symbols, and map practice.

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Quick facts

Abbreviation
OK
Capital
Oklahoma City
Region
South
Nickname
The Sooner State

Easy to confuse with

OR = Oregon
Not OK
OH = Ohio
Not OK
TX = Texas
Not OK
KS = Kansas
Not OK

FAQ

What state is OK?

OK is Oklahoma.

Is OK Oklahoma?

Yes. OK is the USPS postal abbreviation for Oklahoma.

What is the capital of Oklahoma?

The capital of Oklahoma is Oklahoma City.

Which states are easy to confuse with OK?

Watch for codes like OR, OH, TX, KS when you see OK.