Sidney is located in Shelby county Ohio with a geographic area of 12.0 square miles. The total population in Sidney is 20,698 with 48.6% male and 51.4% female. Children under age 5 represent 7.1% of the population, under age 18 equal 23.2% of the population and over age 65 is 16.6% of the population. The median household income is $57,313, per capita income is $27,662. There are a total of 8,489 housing units with 59.7% owner occupied. Education includes 36.8% of residents that are high school graduates and 17.7% with a bachelor's degree or higher. The average temperature in Sidney in the summer is 71 degrees, and in the winter 32 degrees.