A much larger, modern masonry and glass structure behind it (left side of photo), now serves its judicial functions.

Attached to the courthouse is the First Reformed Dutch Church and Cemetery, built in 1898, which has served as the county's Jury Assembly Room since it was renovated around 1985.

The Colonial Assembly passed an act allowing for the building of a court house in Somerset County.

County Freeholders chose Six Mile Run (in Franklin Township), as the site to build the new courthouse and jail.

On 24 September 2010 at 10:23 a.m. a bomb threat was called in evacuating the court house and nearby buildings.