Winfield is a city situated along the Walnut River in the west-central part of Cowley County, located in South Central Kansas, in the Central United States. As of the 2010 census, the city population was 12,301. It is the county seat and most populous city of Cowley County.
In 1877, the Florence, El Dorado, and Walnut Valley Railroad Company built a branch line from Florence to El Dorado, in 1881 it was extended to Douglass, and later to Arkansas City. The line was leased and operated by the Atchison, Topeka and Santa Fe Railway. The line from Florence to El Dorado was abandoned in 1942. The original branch line connected Florence, Burns, De Graff, El Dorado, Augusta, Douglass, Rock, Akron, Winfield, Arkansas City.
Winfield is home to Southwestern College, a four-year private Methodist college and once also held St. John's College before it closed in 1986.