Carthage is located in Jefferson county New york with a geographic area of 2.4 square miles. The total population in Carthage is 3,364 with 45.4% male and 54.6% female. Children under age 5 represent 10.3% of the population, under age 18 equal 27.5% of the population and over age 65 is 16.4% of the population. The median household income is $45,234, per capita income is $25,037. There are a total of 1,285 housing units with 54.3% owner occupied. Education includes 36.1% of residents that are high school graduates and 14.4% with a bachelor's degree or higher. The average temperature in Carthage in the summer is 70 degrees, and in the winter 27 degrees.