Counties and municipalities in the district for the upcoming 114th and successive Congresses (based on redistricting following the 2010 Census), the 12th district (in yellow) contains portions of four counties and 32 municipalities. (source: New Jersey Division of Elections)
Mercer County -(11)
East Windsor, Ewing Township, Hightstown, Hopewell Township, Hopewell, Lawrence Township, Pennington, Princeton Borough, Princeton Township, Trenton, West Windsor Township
Middlesex County -(14)
Cranbury Township, Dunellen, East Brunswick Township, Helmetta, Jamesburg, Middlesex, Milltown, Monroe Township, North Brunswick Township, Old Bridge Township (part, also 6), Plainsboro Township, South Brunswick Township, South River Borough, Spotswood Borough
Somerset County -(4)
Bound Brook, Franklin Township, Manville, South Bound Brook
Union County -(3)
Fanwood, Plainfield, Scotch Plains (part, also 7)
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