High Quality Content by WIKIPEDIA articles! Aberdeen Township is a township in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the township`s population was 18,210, reflecting an increase of 756 (+4.3%) from the 17,454 counted in the 2000 Census, which had in turn increased by 416 (+2.4%) from the 17,038 counted in the 1990 Census.