Main city: Mason City
Timezone: Central
Phone type: Cell Number
Operator: Nextel Communications

Mason City, a city in and the county seat of Cerro Gordo County, Iowa, United States. The population was 28,079 in the 2010 census, a decline from 29,172 in the 2000 census. The Mason City Micropolitan Statistical Area includes all of Cerro Gordo and Worth counties. ^source

Area code 641 is a telephone area code for a central portion of Iowa, including Mason City, and Ottumwa. It was split off from area 515 in 2000; this was the first such split in Iowa since the establishment of the North American Numbering Plan in 1947. ^source