Winterset is a city in and the county seat of Madison County, Iowa, United States. The population was 5,190 at the 2010 census.
Winterset is part of the Des Moines − West Des Moines Metropolitan Statistical Area. It is the birthplace of actor John Wayne.
Winterset was platted during a cool spell in the summer of 1849. The name was originally to be "Summerset", but the unseasonable coldness made the commissioners reverse this to "Winterset".
Winterset is located at 41°20′9″N 94°0′50″W (41.335901, -94.013981).
According to the United States Census Bureau, the city has a total area of 4.72 square miles (12.22 km2), of which, 4.58 square miles (11.86 km2) is land and 0.14 square miles (0.36 km2) is water.
Winterset is located about 30 miles southwest of the state capital of Des Moines.
Winterset has a hot-summer humid continental climate (Köppen Dfa). Summers are warm and humid, while winters are cold and snowy. Precipitation is highest in the summer months.
At the 2010 census there were 5,190 people, 2,062 households, and 1,336 families living in the city. The population density was 1,133.2 inhabitants per square mile (437.5/km2).