Mason City, Illinois

Mason City population, 2020 to 2024

Mason City lost 86 residents from July 2020 to July 2024, a change of -4.2%. In the latest year it moved by -9.

Mason City covers 1.01 square miles of land, for 1,962 people per square mile of land. The median Illinois place of 5,000+ has 2,177, so Mason City is close to the typical town.

What county Mason City is in

All of Mason City's residents live in Mason County, which had 12,543 residents in 2024. Mason City holds 15.8% 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: 62664. 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 40.202200, -89.697100. Springfield, the capital, is 29.2 miles S in a straight line. The nearest larger place is Petersburg, IL (2,156 people), 15.2 miles away. The nearest city of 100,000 or more is Springfield, IL, 28.5 miles away.

Daylight in Mason City

At 40.20° N, Mason City gets about 15 h 02 min of daylight around the June solstice and 9 h 18 min around the December solstice, a swing of 5 h 44 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 Illinois, measured between internal points. The closest is Delavan, 14.1 miles away, with 1,545 people.