Duncan, Oklahoma

Duncan, Oklahoma
City
Location of Duncan, Oklahoma
Coordinates: 34°32′10″N 97°58′21″W / 34.53611°N 97.97250°W / 34.53611; -97.97250
Country	United States
State	Oklahoma
County	Stephens
Area [1]
• Total	47.84 sq mi (123.89 km2)
• Land	42.95 sq mi (111.24 km2)
• Water	4.88 sq mi (12.65 km2)
Elevation [2]	1,211 ft (369 m)
Population  (2020)
• Total	22,692
• Density	528.31/sq mi (203.98/km2)
Time zone	UTC−6 (Central (CST))
• Summer (DST)	UTC−5 (CDT)
ZIP codes	73533-73599
Area code	580
FIPS code	40-21900[3]
GNIS feature ID	2410368[2]
Website	Official website

Duncan is a city in and the county seat of Stephens County, Oklahoma, United States.^[4] Its population was 22,310 at the 2020 census. Centrally located in Stephens County, Duncan became the county seat after Oklahoma achieved statehood in 1907. Oil wells opened in Stephens County in 1918 and led to rapid development. Cotton was a dominant crop until the Dust Bowl brought its decline, but cattle remain an important part of the economy. The Chisholm Trail passed to the east of Duncan prior to the town's founding, which is home to the Chisholm Trail Heritage Center.

Duncan is the birthplace of the Halliburton Corporation.^[5] Erle P. Halliburton established the New Method Oil Well Cementing Company in 1919. Halliburton maintains seven different complexes in Duncan plus an employee recreational park, but the corporate offices relocated first to Dallas and later to Houston.