Stephens County, Oklahoma  Stephens County is a county located in the U.S. state of Oklahoma. As of the 2010 census, the population was 45,048. Its county seat is Duncan. The county was created at statehood, partly from the Chickasaw Nation in Indian Territory and partly from Comanche County in Oklahoma Territory. It was named for Texas politician John Hall Stephens. Stephens County comprises the Duncan, OK Micropolitan Statistical Area. Stephens County was created at statehood from portions of both Oklahoma Territory and Indian Territory. About two-thirds of the area came from Pickens County, Chickasaw Nation, in the Indian Territory, and the western third came from Comanche County, Oklahoma Territory. The town of Duncan was designated as the county seat. County offices were located in rented facilities in Duncan until the first courthouse was built in 1921. That building was replaced by a new facility in 1967. Drilling for oil and gas began about 1910. The first production well did not come in until 1918. Production support activities soon followed. Erle P. Halliburton founded the Halliburton Oil Well Cementing Company in Duncan. The company has since grown into a multinational corporation with headquarters in Dubai and Houston, Texas. According to the U.S. Census Bureau, the county has a total area of , of which is land and (2.4%) is water. It lies within the Red Bed plains. Although there is no major river in the county, there are some creeks that provide drainage. Wildhorse Creek in the eastern part flows into the Washita River. Beaver Creek in the western part of the county flows into the Red River. Lakes in the county include Lake Humphreys, Clear Creek Lake, Duncan Lake, Comanche Lake, and Waurika Lake. As of the census of 2000, there were 43,182 people, 17,463 households, and 12,590 families residing in the county. The population density was 19/km² (49/mi²). There were 19,854 housing units at an average density of 9/km² (23/mi²). The racial makeup of the county was 88.37% White, 2.20% Black or African American, 4.92% Native American, 0.30% Asian, 0.03% Pacific Islander, 1.44% from other races, and 2.74% from two or more races. 3.96% of the population were Hispanic or Latino of any race.