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Elmer is a borough in Salem County in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 1,347, a decrease of 48 (−3.4%) from the 2010 census count of 1,395, which in turn reflected an increase of 11 (+0.8%) from the 1,384 counted in the 2000 census.
Source: Wikipedia