Duncan is located in Oklahoma. Duncan, Oklahoma has a population of 21,853. Duncan is less family-centric than the surrounding county with 28% households with children. The county percentage for households with children is 28%.
The median household income in Duncan, Oklahoma is $47,036. The median household income for the surrounding county is $49,862 compared to the national median of $66,222. The median age of people living in Duncan is 39.6 years.
The average high temperature in July is 93.9 degrees, with an average low temperature in January of 26.7 degrees. The annual precipitation is 36.41.