Piatt County GIS Maps
Piatt County, Illinois, has 16,673 residents and covers 439.2 square miles. The population declined 0.3% between the 2010 and 2020 census. More residents left than arrived over that decade. The FIPS code for Piatt County is 17147.
Monticello is the county's largest population center. Piatt County also includes 11 zip codes, 6 public school districts and 24 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.
Piatt County Trends
- Population
- 16,673▾
- Median Home Value
- $173,200▴
- K-12 Enrollment
- 4,222▴
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.
Piatt 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.
Piatt County Population
Piatt County had 16,673 residents in 2020. That was 0.3% lower than in 2010. Piatt County added 308 people between 2000 and 2020, which points to steady long-term growth. The county is fairly spread out, with about 38 people per square mile. Some of the county's most populated postal areas include Monticello, Bement and Atwood.
Population Trend in Piatt County IL
Piatt County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
Piatt County Zip Codes
Piatt County has 11 zip codes. Some of the county's most populated zip codes include Monticello (61856), Bement (61813) and Atwood (61913). Monticello is the largest zip by population, with about 7,933 residents or 48% of the county total. Together, the three largest zips account for about 67% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in Piatt County IL
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 61856 | Monticello | 7,933 | ▴ 6.7% |
| 61813 | Bement | 1,705 | ▾ -13.5% |
| 61913 | Atwood | 1,563 | ▾ -7.2% |
| 61818 | Cerro Gordo | 1,553 | ▾ -6.7% |
| 61854 | Mansfield | 1,431 | ▾ -0.5% |
| Download all zip code data | |||
Piatt County Zip Code populations and trends per most recent census data.
Piatt County Demographics
Piatt County has a median age of 42.5, which makes the county a little older than Illinois overall. About 21.9% of residents are under 18, while 20.5% 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 29.9% of the population, which points to a solid working-age base. About 31.9% 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 Piatt County IL
Median Age
42.5
Under 18
21.9%
Age 65+
20.5%
Bachelor's+
31.9%
Piatt County School Districts
Piatt County is served by 6 public school districts with 4,222 students enrolled in 2024. The largest districts on the county map are Monticello Community Unit 25, Arthur Community Unit 305 and Blue Ridge Community Unit 18. Those three districts account for about 78% 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 Piatt County IL
| District | Enrollment | Share | Trend |
|---|---|---|---|
| Monticello Community Unit School District 25 | 1,707 | 40.4% | ▴ 1.5% |
| Arthur Community Unit School District 305 | 925 | 21.9% | ▾ -1% |
| Blue Ridge Community Unit School District 18 | 652 | 15.4% | ▾ -2.7% |
| Cerro Gordo Community Unit School District 100 | 474 | 11.2% | ▴ 3% |
| Bement Community Unit School District 5 | 291 | 6.9% | ▾ -2% |
| Download all school district data | |||
Piatt County school district enrollment and trends per most recent NCES reporting data.
Piatt County Housing & Real Estate
Piatt County has a median home value of $173,200 and a median gross rent of $950. About 85% 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 $236,250 and homes spent about 50 days on the market.
Piatt County Housing Mix
Piatt County housing mix: owner, renter and vacant units.
Piatt County Housing Trends
Piatt County median home value and rent trend (last 5 years).
Businesses in Piatt County, IL
Piatt County has 675 business listings across 252 categories. The largest categories in Piatt County business listings are Churches & Religious Organizations (36, 5.3%), Community & Nonprofits (17, 2.5%), and Libraries (17, 2.5%). The full Piatt County business listings dataset includes names, categories, addresses and contact details where available. Piatt County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in Piatt County, IL
| Category | Businesses | Share |
|---|---|---|
| Churches & Religious Organizations | 36 | 5.3% |
| Community & Nonprofits | 17 | 2.5% |
| Libraries | 17 | 2.5% |
| Farm | 16 | 2.4% |
| Public And Government Association | 15 | 2.2% |
| Parks & Recreation | 13 | 1.9% |
| Post Offices | 11 | 1.6% |
| Contractors | 10 | 1.5% |
| Auto Repair | 9 | 1.3% |
| Elementary School | 9 | 1.3% |
Piatt County Business Listings
| Business | Category | City |
|---|---|---|
| Kelly's Accounting Service | Accountant | Monticello |
| PreGame Sports Complex | Active Life | Monticello |
| Clarkson Grain Company | Agricultural Cooperatives | Cerro Gordo |
| Clarkson Specialty Lecithins | Agricultural Service | Cerro Gordo |
| Reetz Agronomics | Agriculture | Monticello |
| Marvin D Bradd Airport | Airport | Piatt County |
| Tom's Bowl | American Restaurants | Bement |
| Piatt County Animal Shelter Inc - PCAS | Animal Shelters | Monticello |
| Mary, Maude & Me | Antique Store | Monticello |
| Cobra Archery | Archery Shop | Mansfield |
| Download Piatt County business listings | ||
Piatt County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
Piatt County Basemaps
Piatt 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 Piatt County Data Package
This page shows a preview of what's included in the Piatt 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 Piatt County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.