Colby is located in Clark county Wisconsin with a geographic area of 1.6 square miles. The total population in Colby is 2,539 with 49.8% male and 50.2% female. Children under age 5 represent 6.6% of the population, under age 18 equal 27.3% of the population and over age 65 is 24.1% of the population. The median household income is $47,750, per capita income is $22,828. There are a total of 880 housing units with 61.5% owner occupied. Education includes 48.9% of residents that are high school graduates and 8.3% with a bachelor's degree or higher. The average temperature in Colby in the summer is 66 degrees, and in the winter 17 degrees.