Princeton (formerly, Ket-tee) is an unincorporated community in Colusa County, California. It lies at an elevation of 82 feet. Its zip code is 95970 and its area code is 530. In the state legislature Princeton is located in the 4th Senate District, represented by Republican Sam Aanestad, and in the 2nd Assembly District, represented by Republican Doug LaMalfa. Federally, Princeton is located in California's 2nd congressional district, which has a Cook PVI of R +13 and is represented by Republican Wally Herger.