Onslow is a city located in Jones County, in the state of Iowa (IA), United States. Nestled in the West North Central division of the Midwest region, it covers an area of 0.2 square miles (1.0 km²) and sits at an elevation of 916 ft. With a population of approximately 223 residents, Onslow offers a peaceful, rural atmosphere.
The town's population is composed of about 45.29% males and 54.71% females, and it has a population density of 969.57 people per square mile (374.35/km²). Onslow lies at a latitude of 42.11 and a longitude of -91.02, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (15.7%), followed by English (4.9%), German (24.7%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 52321.