Glen Ridge is a borough in Essex County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 7,802, an increase of 275 (+3.7%) from the 2010 census count of 7,527, which in turn reflected an increase of 256 (+3.5%) from the 7,271 counted in the 2000 census. The borough is notable for being one of a few in New Jersey preserving the use of gas lamps for street lighting.