Lincoln is located in Providence county Rhode island with a geographic area of square miles. The total population in Lincoln is 21,793 with 47.6% male and 52.4% female. Children under age 5 represent 6.3% of the population, under age 18 equal 23.2% of the population and over age 65 is 20.1% of the population. The median household income is $88,171, per capita income is $42,156. There are a total of 8,086 housing units with 66.3% owner occupied. Education includes 21.9% of residents that are high school graduates and 43.5% with a bachelor's degree or higher. The average temperature in Lincoln in the summer is 69 degrees, and in the winter 33 degrees.