Freehold is a borough in Monmouth County, New Jersey, United States. It is the county seat of Monmouth County. As of the 2010 United States Census, the borough's population was 12,052, reflecting an increase of 1,076 (+9.8%) from the 10,976 counted in the 2000 Census, which had in turn increased by 234 (+2.2%) from the 10,742 counted in the 1990 Census.