South Amboy is a city in Middlesex County, New Jersey, set on the shore of Raritan Bay directly across the Raritan River from Perth Amboy. It is one of the county's most compact municipalities, covering just over one square mile, yet its waterfront and rail connections give it outsized regional importance. The city reported 9,411 residents at the 2020 census, with Sayreville bordering it to the west and the bay forming its eastern edge. South Amboy's history stretches back to New Jersey's colonial era, when the area around the Raritan was settled by the Dutch, and the city later developed as a rail and ferry crossroads serving the corridor between central New Jersey and New York City. The North Jersey Coast Line has long anchored the city's transit identity, and its station remains one of the defining features of the downtown. In recent decades South Amboy has embraced its waterfront, carrying out a sustained redevelopment of former industrial and brownfield land along Raritan Bay. The result is a connected bayfront with new housing, a public walkway, and pedestrian and cycling links that tie the downtown, the rail station, and the water together into more than a mile and a half of continuous waterfront access. This transformation has made the city one of Middlesex County's most transit-oriented and water-focused communities. The city functions primarily as a commuter community, with many residents traveling by rail toward New York while others work across central New Jersey. Students attend the South Amboy School District, a K-12 system anchored by South Amboy Middle High School. For households seeking a dense, walkable, bayfront setting with strong rail access to the region's employment centers, South Amboy offers a distinctive combination of history, water, and transit in a compact urban footprint.