Chelsea is located in Tama county Iowa with a geographic area of 1.0 square miles. The total population in Chelsea is 259 with 54.8% male and 45.2% female. Children under age 5 represent 1.9% of the population, under age 18 equal 30.9% of the population and over age 65 is 7.3% of the population. The median household income is $41,250, per capita income is $15,260. There are a total of 80 housing units with 78.8% owner occupied. Education includes 47.5% of residents that are high school graduates and 6.3% with a bachelor's degree or higher. The average temperature in Chelsea in the summer is 72 degrees, and in the winter 23 degrees.