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of the U.S. state of Oklahoma. The population was 718,633 at the 2010 census. The county seat and principal city is Oklahoma City . Oklahoma County is at the heart of the Oklahoma City Metropolitan Statistical Area and is the most populous county in the state. Oklahoma County is one of seven US counties to share its name with its state (the others are Arkansas County, Hawaii County, Idaho County, Iowa County, New York County and Utah County). |