Mason City is a city in Mason County, Illinois, home to about 2,159 people across 1.0 square miles. Its ZIP code is 62664.
Homes sold for a median of $95 per square foot in the three months ending August 2026, a seller’s market.
Each card is that ZIP code’s whole market, including any part outside Mason City. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Mason City’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)107 miles away |
|---|---|
| Closer regional airport | Abraham Lincoln Capital Airport (SPI)25 miles away |
| Nearest city of 250,000+ | St. Louis, MO112 miles away |
| Nearest city of 1 million+ | Chicago, IL154 miles away |
Straight-line distances from the center of Mason City; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Mason City had 2,077 residents in the 2020 census, down 19% since 2000.
It’s the 490th largest of 1,450 towns in Illinois by population.
Mason County grew from 17,491 residents in 1900 to 13,086 in 2020.
Mason County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 16°F. About 39.3 inches of rain and melted snow fall in a typical year, with about 13 inches of snow.
Source: NOAA 1991–2020 climate normals, Mason City 4se, IL weather station (4 miles away).
1,974 jobs at 255 businesses in Mason County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
4 doctors and other health care providers list an office in Mason City.
Nearest hospitals
Providers with an office here
| Dentists | 1 |
|---|---|
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 1 |
| Chiropractors | 1 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Libraries (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Public schools here are run by Illini Central CUSD 189. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| West Campus FacilityMason City | Pre-K | 65 | Public | <0.1 mi |
| Illini Central Grade SchoolMason City | K–5 | 264 | Public | 0.5 mi |
| Illini Central Middle SchoolMason City | 6–8 | 139 | Public | 0.5 mi |
| Illini Central High SchoolMason City | 9–12 | 172 | Public | 0.5 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.