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The museum of the Warren County Historical and Genealogical Society, located at 313 Mansfield Street, stands within the historic district in the county seat of Belvidere, New Jersey.

The Federal brick townhouse was built circa 1848 and was purchased by the Historical Society from Clara Smith in August 1980. It officially opened as a museum in August 1984.

The museum is open Sundays 12 - 4 p.m.