Cinnaminson Township is a township in Burlington County, in the U.S. state of New Jersey. Cinnaminson Township borders the Delaware River, and is an eastern suburb of Philadelphia. As of the 2020 United States census, the township's population was 17,064, an increase of 1,495 (+9.6%) from the 2010 census count of 15,569, which in turn reflected an increase of 974 (+6.7%) from the 14,595 counted in the 2000 census. The township, and all of Burlington County, is a part of the Philadelphia metropolitan area.