Glen Gardner is a borough in Hunterdon County, New Jersey, United States. At the time of the 2010 United States Census, the borough's population was 1,704, reflecting a decline of 198 (-10.4%) from the 1,902 counted in the 2000 Census, which had in turn increased by 237 (+14.2%) from the 1,665 counted in the 1990 Census.
Glen Gardner is located at the extreme western border of Lebanon Township and was incorporated as a borough by an act of the New Jersey Legislature on March 26, 1919, from portions of both Lebanon Township and Bethlehem Township based on the results of a referendum held that same day. Portions of the borough were ceded to Hampton borough in 1931.
Originally settled by the Lenape Native Americans, European settlement began around the time of the American Revolutionary War.
The area that is now Glen Gardner had been known as Eveland's Tavern for tavernkeeper John Eveland. Later, the area was variously called Spruce Run Mills and Sodom. The name of both the community and post office were officially changed to Glen Gardner in 1871 to mark the Spruce Run glen and in honor of the Gardner brothers who owned a chair and frame factory in the area.
According to the United States Census Bureau, the borough had a total area of 1.55 square miles (4.01 km2), all of which was land.
Bells Crossing and Clarksville are unincorporated communities located within Glen Gardner.
The borough borders the Hunterdon County municipalities of Bethlehem Township, Hampton Borough and Lebanon Township.
The 2010 United States Census counted 1,704 people, 768 households, and 434 families in the borough. The population density was 1,117.8 inhabitants per square mile (431.6/km2). There were 825 housing units at an average density of 541.2 per square mile (209.0/km2). The racial makeup was 94.54% (1,611) White, 1.76% (30) Black or African American, 0.06% (1) Native American, 1.82% (31) Asian, 0.00% (0) Pacific Islander, 0.35% (6) from other races, and 1.47% (25) from two or more races. Hispanic or Latino of any race were 5.28% (90) of the population.
Of the 768 households, 28.4% had children under the age of 18; 45.1% were married couples living together; 8.5% had a female householder with no husband present and 43.5% were non-families. Of all households, 35.3% were made up of individuals and 7.6% had someone living alone who was 65 years of age or older.