Stephens County was created at statehood from portions of both Oklahoma Territory and Indian Territory. About two-thirds of the area came fromPickens County, Chickasaw Nation, in the Indian Territory,[4] 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.[3]
According to theU.S. Census Bureau, the county has a total area of 891 square miles (2,310 km2), of which 21 square miles (54 km2) (2.4%) are covered by water.[5] It lies within theRed Bed plains. Although no major river is in the county, some creeks provide drainage. Wildhorse Creek in the eastern part flows into theWashita River. Beaver Creek in the western part of the county flows into theRed River. Lakes in the county include Lake Humphreys, Clear Creek Lake, Duncan Lake, Comanche Lake, andWaurika Lake.[3]
As of the2020 census, the county had a population of 42,848. Of the residents, 23.2% were under the age of 18 and 21.2% were 65 years of age or older; the median age was 42.1 years. For every 100 females there were 95.1 males, and for every 100 females age 18 and over there were 92.9 males.[11][12]
There were 17,268 households in the county, of which 29.7% had children under the age of 18 living with them and 25.5% had a female householder with no spouse or partner present. About 27.8% of all households were made up of individuals and 13.8% had someone living alone who was 65 years of age or older.[11]
There were 20,322 housing units, of which 15.0% were vacant. Among occupied housing units, 70.9% were owner-occupied and 29.1% were renter-occupied. The homeowner vacancy rate was 3.2% and the rental vacancy rate was 14.7%.[11]
As of the census of 2000, 43,182 people, 17,463 households, and 12,590 families were residing in the county.[13] Thepopulation 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 orAfrican American, 4.92%Native American, 0.30%Asian, 0.03%Pacific Islander, 1.44% fromother races, and 2.74% from two or more races; 3.96% of the population wereHispanic orLatino of any race.
In 2000, there were 17,463 households, out of which 30.40% had children under the age of 18 living with them, 59.50% weremarried couples living together, 9.20% had a female householder with no husband present, and 27.90% were non-families. 25.30% of all households were made up of individuals, and 12.80% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.91. In the county, the population was spread out, with 24.60% under the age of 18, 7.80% from 18 to 24, 25.10% from 25 to 44, 24.00% from 45 to 64, and 18.50% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 93.70 males. For every 100 females age 18 and over, there were 89.70 males.
In 2000, the median income for a household in the county was $30,709, and the median income for a family was $36,371. Males had a median income of $30,428 versus $20,055 for females. Theper capita income for the county was $16,357. About 11.60% of families and 14.60% of the population were below thepoverty line, including 19.50% of those under age 18 and 11.90% of those age 65 or over.