Rockaway Township is a township in Morris County, New Jersey, United States. As of the 2010 United States Census, the township's population was 24,156, reflecting an increase of 1,226 (+5.3%) from the 22,930 counted in the 2000 Census, which had in turn increased by 3,358 (+17.2%) from the 19,572 counted in the 1990 Census.