South Amboy, a city of Middlesex county, New Jersey, U.S.A., on Raritan Bay at the mouth of the Raritan river, about 27 m. S.W. of New York City. Pop. (1900) 6349 (1700 foreign-born); (1910) 7007. It is served by the Pennsylvania, the Central of New Jersey, and the Raritan River railways. A railway drawbridge and a traffic bridge across the river connect the city with Perth Amboy. South Amboy is an important point for shipments of coal from the Pennsylvania mines. The Pennsylvania Railroad Company and the Susquehanna Coal Company have coal docks here and the latter has great storage yards. Among the city’s industries are the mining of clay and sand, and the manufacture of terra cotta. South Amboy, originally a part of South Amboy township (incorporated in 1798), was laid out in 1835, was incorporated as a borough in 1888, and became a city under a general state law in 1908.