Caldwell is located in Sumner county Kansas with a geographic area of 1.1 square miles. The total population in Caldwell is 971 with 47.5% male and 52.5% female. Children under age 5 represent 4.1% of the population, under age 18 equal 14.8% of the population and over age 65 is 31.9% of the population. The median household income is $36,103, per capita income is $26,005. There are a total of 531 housing units with 68.4% owner occupied. Education includes 31.6% of residents that are high school graduates and 15.4% with a bachelor's degree or higher. The average temperature in Caldwell in the summer is 78 degrees, and in the winter 32 degrees.