Plainsboro public schools are part of the West Windsor-Plainsboro School District, a unique pairing of two municipalities from different counties.
West Windsor Township is part of Mercer County.  Plainsboro Township is part of Middlesex County.  Many educational directories, including the New Jersey Department of Education guides, choose only one county  – Mercer – to list this district. If you do not see “Plainsboro” in a school directory list, check the entries for “West Windsor” under the Mercer County listings.