Plymouth is located in Amador county California with a geographic area of 2.6 square miles. The total population in Plymouth is 1,031 with 56.2% male and 43.8% female. Children under age 5 represent 3.2% of the population, under age 18 equal 21.4% of the population and over age 65 is 11.6% of the population. The median household income is $71,750, per capita income is $32,270. There are a total of 364 housing units with 63.7% owner occupied. Education includes 27.7% of residents that are high school graduates and 21.7% with a bachelor's degree or higher. The average temperature in Plymouth in the summer is 76 degrees, and in the winter 43 degrees.
