Hennessey is located in Kingfisher county Oklahoma with a geographic area of 3.7 square miles. The total population in Hennessey is 2,996 with 51.6% male and 48.4% female. Children under age 5 represent 10.6% of the population, under age 18 equal 28.4% of the population and over age 65 is 12.0% of the population. The median household income is $51,250, per capita income is $29,139. There are a total of 1,003 housing units with 64.7% owner occupied. Education includes 41.5% of residents that are high school graduates and 20.3% with a bachelor's degree or higher. The average temperature in Hennessey in the summer is 80 degrees, and in the winter 42 degrees.
