Colusa is located in Colusa county California with a geographic area of 3.4 square miles. The total population in Colusa is 6,111 with 50.4% male and 49.6% female. Children under age 5 represent 5.7% of the population, under age 18 equal 25.9% of the population and over age 65 is 16.2% of the population. The median household income is $54,605, per capita income is $27,753. There are a total of 2,452 housing units with 61.9% owner occupied. Education includes 23.8% of residents that are high school graduates and 18.8% with a bachelor's degree or higher. The average temperature in Colusa in the summer is 75 degrees, and in the winter 43 degrees.