Mason City is a city located in the state of Iowa, United States. It serves as the county seat of Cerro Gordo County. According to the 2020 census, the city had a population of 27,338 residents.
The city is recognized for its musical heritage and its history as an industrial center for cement production and brickyards. Additionally, Mason City features a significant collection of Prairie School style architecture. Together with nearby Clear Lake, it functions as a regional hub for commerce, industry, and culture in north-central Iowa.