Onslow Map
Onslow is a city in Jones County, Iowa, United States. The population was 223 at the 2000 census. It is part of the Cedar Rapids Metropolitan Statistical Area.
Onslow is located at 42°6?20?N 91°0?55?W / 42.10556°N 91.01528°W / 42.10556; -91.01528 (42.105603, -91.015158).
According to the United States Census Bureau, the city has a total area of 0.2 square miles (0.6 km²), all of it land.
Nearby cities include Monticello, Cascade, Anamosa, Lost Nation, Clarence.