Mason City, Iowa

Mason City population, 2020 to 2024

Mason City lost 332 residents from July 2020 to July 2024, a change of -1.2%. In the latest year it moved by -6. Among 85 Iowa places of 5,000 or more, that growth ranks 69th; the median place changed by +1.1%. The median place of 5,000+ in Iowa has 9,511 people, so Mason City is 2.8 times that size.

Mason City covers 28.22 square miles of land and 0.30 of water, for 955 people per square mile of land. The median Iowa place of 5,000+ has 1,363, so Mason City is less dense than the typical town.

What county Mason City is in

All of Mason City's residents live in Cerro Gordo County, which had 42,493 residents in 2024. Mason City holds 63.4% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Mason City

1 ZIP Code Tabulation Area (ZCTA) overlaps Mason City by at least 10% of the ZCTA's or the city's land: 50401. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Mason City is

The Census internal point of Mason City is at 43.147800, -93.200400. Des Moines, the capital, is 109.5 miles S in a straight line. The nearest larger place is Cedar Falls, IA (41,417 people), 57.6 miles away. The nearest city of 100,000 or more is Rochester, MN, 69.9 miles away.

Daylight in Mason City

At 43.15° N, Mason City gets about 15 h 23 min of daylight around the June solstice and 8 h 59 min around the December solstice, a swing of 6 h 24 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Mason City

The eight nearest incorporated places of 1,000+ in Iowa, measured between internal points. The closest is Clear Lake, 8.8 miles away, with 7,602 people.