Chelsea is located in Kennebec county Maine with a geographic area of square miles. The total population in Chelsea is 2,719 with 53.5% male and 46.5% female. Children under age 5 represent 3.9% of the population, under age 18 equal 22.8% of the population and over age 65 is 23.8% of the population. The median household income is $62,591, per capita income is $28,224. There are a total of 1,023 housing units with 93.7% owner occupied. Education includes 38.9% of residents that are high school graduates and 21.2% with a bachelor's degree or higher. The average temperature in Chelsea in the summer is 68 degrees, and in the winter 25 degrees.