First-order administrative division in Middlesex County, New Jersey
Borough of Carteret Borough of Dunellen Borough of Helmetta Borough of Highland Park Borough of Jamesburg Borough of Metuchen Borough of Middlesex Borough of Milltown Borough of Sayreville Borough of South Plainfield Borough of South River Borough of Spotswood City of New Brunswick City of Perth Amboy City of South Amboy Middlesex County Township of Cranbury Township of East Brunswick Township of Edison Township of Monroe Township of North Brunswick Township of Old Bridge Township of Piscataway Township of Plainsboro Township of South Brunswick Township of Woodbridge