Princeton, New Jersey is locate in Mercer County, New Jersey, United States. Princeton University has been sited in the town since 1756. Although Princeton is a "college town", there are other important institutions in the area, including the Institute for Advanced Study, Educational Testing Service (ETS), Opinion Research Corporation, Siemens Corporate Research, Sarnoff Corporation, FMC Corporation, The Robert Wood Johnson Foundation, Princeton Theological Seminary, Westminster Choir College, Church and Dwight and Dow Jones & Company.