The Somerville Police Department is located at 24 South Bridge Street in Somerville New Jersey 08876. Somerville is the county seat of Somerset County and is at or near the crossroads of Rt 22, Rt 202-206, I-287 and I-78. For an emergency call 911. For non-emergencies and inquiries call 908-725-0331. you may also email us at info@somervillepd.org .