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 87 the early 1960s, SH-87's length was at its zenith, as the highway stretched from Idabel to the Arkansas state line. However, on 1963-01-07, US-259 was established. The section of SH-87 from Idabel through Harris was turned over to the new U.S. route, setting the western terminus of the highway to its present-day location. Oklahoma State Highway 87 State Highway 87 is a highway in southeastern Oklahoma, running for . It passes through the extreme southeastern corner of the state, running entirely through McCurtain Co.. It has no lettered spur routes. SH-87 begins at an intersection with US-259 near the unincorporated