Winfield is a city and county seat of Cowley County, Kansas, United States. It is situated along the Walnut River in South Central Kansas. As of the 2010 census, the city population was 12,301 and second most populous city of Cowley County.
Winfield is situated along the Walnut River at its confluence with Timber Creek. It is located 17 miles (27 km) north of the Kansas-Oklahoma state border at the junction of U.S. Routes 77 and 160. State highway route K-15 follows U.S. Route 77 to the north of the city and U.S. Route 160 to the east. K-360 is a bypass around the southeastern part of the city between U.S. Route 77 and U.S. Route 160. Arkansas City is 13 miles (21 km) south of Winfield along U.S. Route 77, and Strother Field, a general aviation airport, is about five miles (8 km) south.
According to the United States Census Bureau, the city has a total area of 12.93 square miles (33.49 km), of which, 11.56 square miles (29.94 km) is land and 1.37 square miles (3.55 km) is water.
As of the census of 2010, there were 12,301 people, 4,600 households, and 2,848 families residing in the city. The population density was 1,064.1 inhabitants per square mile (410.9/km). There were 5,217 housing units at an average density of 451.3 per square mile (174.2/km). The racial makeup of the city was 85.7% White, 3.9% African American, 1.3% Native American, 3.9% Asian, 1.8% from other races, and 3.4% from two or more races. Hispanic or Latino of any race were 6.1% of the population.
There were 4,600 households of which 32.0% had children under the age of 18 living with them, 44.7% were married couples living together, 12.2% had a female householder with no husband present, 5.1% had a male householder with no wife present, and 38.1% were non-families. 32.5% of all households were made up of individuals and 13.8% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.98.
The median age in the city was 36.7 years. 23% of residents were under the age of 18; 12% were between the ages of 18 and 24; 25% were from 25 to 44; 24.4% were from 45 to 64; and 15.7% were 65 years of age or older. The gender makeup of the city was 50.7% male and 49.3% female.
As of the census of 2000, there were 12,206 people, 4,627 households, and 2,952 families residing in the city. The population density was 1,104.0 people per square mile (426.1/km²). There were 5,049 housing units at an average density of 456.7 per square mile (176.3/km²). The racial makeup of the city was 88.06% White, 3.26% Black or African American, 1.08% Native American, 3.74% Asian, 0.02% Pacific Islander, 1.73% from other races, and 2.12% from two or more races. Hispanic or Latino of any race were 4.66% of the population.
There were 4,627 households out of which 31.9% had children under the age of 18 living with them, 49.6% were married couples living together, 10.7% had a female householder with no husband present, and 36.2% were non-families. 32.4% of all households were made up of individuals and 16.9% had someone living alone who was 65 years of age or older. The average household size was 2.36 and the average family size was 3.00.
In the city, the population was spread out with 24.9% under the age of 18, 11.8% from 18 to 24, 27.4% from 25 to 44, 19.4% from 45 to 64, and 16.6% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 98.5 males. For every 100 females age 18 and over, there were 97.0 males.
The median income for a household in the city was $34,443, and the median income for a family was $44,539. Males had a median income of $31,768 versus $21,605 for females. The per capita income for the city was $19,162. About 9.9% of families and 13.8% of the population were below the poverty line, including 18.6% of those under age 18 and 11.4% of those age 65 or over.