The Somerset County Historical Society's offices are in the historic Van Veghten House. The organization works to discover and preserve the history of Somerset County and offers a collection of published and unpublished historical and genealogical materials. It also assists those looking for historical information about the county. In addition, the society maintains its own library with a bound-book document collection that holds maps, periodicals, photographs, census records, newspapers and genealogies. To discover more about Somerset County, the historical society offers events and tours that provide additional information.

The house in which the Historical Society keeps its information was originally built by Somerset County resident Michael Van Veghten in 1720 on the north bank of the Raritan River. It was headquarters for Quartermaster Nathanael Greene between 1778 and 1779, when Michael Van Veghten's son offered the property for use by the Continental Army.