Palmyra is a borough in Burlington County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 7,398, reflecting an increase of 307 from the 7,091 counted in the 2000 Census, which had in turn increased by 35 from the 7,056 counted in the 1990 Census.Palmyra was originally incorporated as a township by an act of the New Jersey Legislature on April 19, 1894, from portions of Cinnaminson Township and Riverton. On February 20, 1923, Palmyra was reincorporated as a borough.