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 Highway 156 along the highway. The entirety of SH-156 was once part of US-77. US-77 was realigned and SH-156 was assigned to the old alignment on March 1, 1965. On July 14, 1969, US-60/US-77/US-177 was realigned at SH-156's north end, necessitating a slight extension northward. No further changes have taken place since 1969. Oklahoma State Highway 156 State Highway 156, abbreviated SH-156, is a highway maintained by the U.S. state of Oklahoma. Spanning through the north-central part of the state, it connects the town of Marland, Oklahoma to US-60/US-77/US-177 in the north to US-77 in the west. It is the former alignment