Florence Township is a township in Burlington County, New Jersey, United States. As of the 2010 United States Census, the township's population was 12,109, reflecting an increase of 1,363 from the 10,746 counted in the 2000 Census, which had in turn increased by 480 from the 10,266 counted in the 1990 Census.Florence was incorporated as a township by an act of the New Jersey Legislature on March 7, 1872, from portions of Mansfield Township. The township was named for Florence, Italy.