Princeton, NJ is located in Mercer County. It is home to 43397 people. The median household income is $90,977.00 (Source: 2000 Census). The average home value was $308,100.00 (Source: 2000 Census). Nearby towns and cities include Princeton, Hightstown, Plainsboro, Princeton Junction, Pennington. Find listings of real estate for sale in Princeton below.