Oklahoma County, Oklahoma Oklahoma County, Oklahoma Oklahoma County is a county located in the central part of the U.S. state of Oklahoma. As of the 2010 census, the population was 718,633, making it the most populous county in Oklahoma. The county seat is Oklahoma City, the state capital. Oklahoma County is at the heart of the Oklahoma City Metropolitan Statistical Area. Oklahoma County is one of seven counties in the United States to share the same name as the state it is located in (the other six counties are Arkansas County, Hawaii County, Idaho County, Iowa County, New York County (known commonly as
Oklahoma State Capitol of their operations to the Oklahoma Judicial Center in 2011, leaving only the Supreme Court Hearing Chamber in the capitol building. The state capitol complex is the only state capitol grounds in the United States with active oil rigs. Oklahoma's territorial capital and first state capital was located in the city of Guthrie. The settlement of the first state capital began at noon on April 22, 1889, when cannons sounded the start of the Oklahoma land run. The town was designated as the territorial capital in 1890. State government officials let voters decide on whether or not to move the