Elmer is a borough in Salem County, New Jersey, United States. 1,395, reflecting an increase of 11 (+0.8%) from the 1,384 counted in the 2000 Census, which had in turn declined by 187 (-11.9%) from the 1,571 counted in the 1990 Census. It is the home of the annual Appel Farm Arts and Music Festival, which celebrated its 23rd year in 2012.
Elmer was incorporated as a borough by an Act of the New Jersey Legislature on January 28, 1893, from portions of Pittsgrove Township and Upper Pittsgrove Township, based on the results of a referendum held four days earlier. The borough was formed on the boundary of Pittsgrove and Upper Pittsgrove Townships and was named for Lucius Elmer a former judge who helped obtain a post office for the community during his service as Congressman. Elmer is a dry town where alcohol cannot be sold.