Onawa is a city located in Monona 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 4.9 square miles (13.0 km²) and sits at an elevation of 1052 ft. With a population of approximately 3,091 residents, Onawa offers a peaceful, rural atmosphere.
The town's population is composed of about 46.85% males and 53.15% females, and it has a population density of 629.53 people per square mile (243.06/km²). Onawa lies at a latitude of 42.03 and a longitude of -96.1, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (7.3%), followed by English (14.6%), German (29.3%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 51040.