Hamlin, Iowa is a small town located in Audubon County with a population of just over 300. The climate in Hamlin is typical of the Midwestern United States with hot summers and cold winters. The town is situated in the Raccoon River watershed, which is a tributary of the Des Moines River. Hydrology constituents in the area include nitrate and phosphorus, which can impact water quality. Outdoor recreation opportunities in Hamlin include nearby lakes for fishing and boating, as well as parks for hiking and picnicking. The town also has a golf course and a baseball field for sports enthusiasts.