Jefferson is located in Lincoln county Maine with a geographic area of square miles. The total population in Jefferson is 2,380 with 54.5% male and 45.5% female. Children under age 5 represent 9.5% of the population, under age 18 equal 24.5% of the population and over age 65 is 23.7% of the population. The median household income is $62,500, per capita income is $28,061. There are a total of 918 housing units with 85.3% owner occupied. Education includes 40.7% of residents that are high school graduates and 30.7% with a bachelor's degree or higher. The average temperature in Jefferson in the summer is 68 degrees, and in the winter 25 degrees.