Mason County GIS Maps
Mason County, Illinois, has 13,086 residents and covers 539.3 square miles. The population declined 10.8% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Mason County is 17125.
Havana is the county's largest population center. Mason County also includes 8 zip codes, 3 public school districts and 33 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
Mason County Trends
- Population
- 13,086▾
- Median Home Value
- $106,100▴
- K-12 Enrollment
- 2,307▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
Mason County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
Mason County Population
Mason County had 13,086 residents in 2020. That was 10.8% lower than in 2010. Mason County had 2,952 fewer people in 2020 than it did in 2000, which points to a long-term population decline. The county is fairly spread out, with about 24 people per square mile. Some of the county's most populated postal areas include Havana, Mason City and San Jose.
Population Trend in Mason County IL
Mason County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Mason County Zip Codes
Mason County has 8 zip codes. Some of the county's most populated zip codes include Havana (62644), Mason City (62664) and San Jose (62682). Havana is the largest zip by population, with about 4,690 residents or 36% of the county total. Together, the three largest zips account for about 62% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Mason County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 62644 | Havana | 4,690 | ▾ -12.9% |
| 62664 | Mason City | 2,712 | ▾ -10.8% |
| 62682 | San Jose | 745 | ▾ -17.9% |
| 62617 | Bath | 662 | ▾ -13.1% |
| 61567 | Topeka | 645 | ▴ 3.4% |
| Download all zip code data | |||
Mason County Zip Code populations and trends per most recent census data.
Mason County Demographics
Mason County has a median age of 45.5, which makes the county a little older than Illinois overall. About 20.6% of residents are under 18, while 23% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 28.2% of the population, which points to a solid working-age base. About 17.1% of adults have a bachelor's degree or higher, above the statewide figure of 37.2%. The county is mostly White by population, though Hispanic, Asian, Black and multiracial residents are also part of the local mix.
Key Demographics for Mason County IL
Median Age
45.5
Under 18
20.6%
Age 65+
23%
Bachelor's+
17.1%
Mason County School Districts
Mason County is served by 3 public school districts with 2,307 students enrolled in 2024. The largest districts on the county map are Midwest Central Community Unit 191, Havana Community Unit 126 and Illini Central Community Unit 189. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in Mason County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Midwest Central Community Unit School District 191 | 848 | 36.8% | ▾ -0.1% |
| Havana Community Unit School District 126 | 819 | 35.5% | ▾ -4% |
| Illini Central Community Unit School District 189 | 640 | 27.7% | ▾ -4.2% |
| Download all school district data | |||
Mason County school district enrollment and trends per most recent NCES reporting data.
Mason County Housing & Real Estate
Mason County has a median home value of $106,100 and a median gross rent of $760. About 81% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run below the Illinois median, while rents come in below the state average. In March 2026, the median listing price was $80,550 and homes spent about 58 days on the market.
Mason County Housing Mix
Mason County housing mix: owner, renter and vacant units.
Mason County Housing Trends
Mason County median home value and rent trend (last 5 years).
Businesses in Mason County, IL
Mason County has 573 business listings across 222 categories. The largest categories in Mason County business listings are Churches & Religious Organizations (27, 4.7%), Bars & Nightlife (17, 3.0%), and Parks & Recreation (17, 3.0%). The full Mason County business listings dataset includes names, categories, addresses and contact details where available. Mason County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Mason County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 27 | 4.7% |
| Bars & Nightlife | 17 | 3.0% |
| Parks & Recreation | 17 | 3.0% |
| Community & Nonprofits | 12 | 2.1% |
| Public And Government Association | 10 | 1.7% |
| Auto Repair | 10 | 1.7% |
| ATMs | 10 | 1.7% |
| Beauty Salons | 10 | 1.7% |
| Post Offices | 10 | 1.7% |
| Lake | 9 | 1.6% |
Mason County Business Listings
| Business | Category | City |
|---|---|---|
| Leann K Bonnett CPA | Accountant | Havana |
| Patterson Bay | Active Life | Springfield |
| SJB Promotions, Inc. | Advertising Agency | Mason City |
| Rickett Grain Co | Agricultural Cooperatives | Forest City |
| Perkins Seed House | Agricultural Service | Havana |
| Farmers Grain of Teheran | Agriculture | Mason City |
| Havana Regional Airport - 9I0 | Airport | Havana |
| Mason County Ambulance Services | Ambulance And Ems Services | Mason City |
| Babe's | American Restaurants | Havana |
| Pets With Out Parents of Mason | Animal Shelters | Mason City |
| Download Mason County business listings | ||
Mason County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Mason County Basemaps
Mason County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full Mason County Data Package
This page shows a preview of what's included in the Mason County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border Mason County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.