Atco is an unincorporated area in Waterford Township in Camden County, New Jersey. It is a part of the Philadelphia-Camden metropolitan area. It is is at the western edge of Wharton State Forest and the Pine Barrens, and is home to the Atco Raceway. There is a 30 acre lake in Atco, named Lake Atco.
There is a train station for Atco on the Atlantic City Line, which is operated by New Jersey Transit.