Princeton Meadows is an unincorporated community and census-designated place in Plainsboro Township, Middlesex County, New Jersey, United States. As of the 2020 census, the population was 14,776. The community is in southwestern Middlesex County, in the eastern part of Plainsboro Township. It is bordered to the west by Plainsboro Center…Princeton Meadows is an unincorporated community and census-designated place in Plainsboro Township, Middlesex County, New Jersey, United States. As of the 2020 census, the population was 14,776. The community is in southwestern Middlesex County, in the eastern part of Plainsboro Township. It is bordered to the west by Plainsboro Center. The borough of Princeton is 6 miles to the west, Cranbury is 4 miles to the southeast, and New Brunswick, the Middlesex county seat, is 15 miles to the northeast.