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Piatt County, IL
10 cities and towns and 11 ZIP codes in Piatt County, Illinois.
Population
16,695
Land area
439sq mi
People per sq mi
38
ZIP codes
11
Cities and towns in Piatt County
Piatt County at a glance
- Piatt County is 83% less dense than Illinois as a whole.
- The median household income is $94,811, 14% above the Illinois median of $83,390.
- A typical owner-occupied home is valued at $180,600 (31% below Illinois) and median rent is $1,046 a month.
- Its largest cities are Monticello (6,304), Bement (1,792) and Cerro Gordo (1,349).
Local data for Piatt County, IL
Counts from official public data
Housing and community stats
Piatt County, IL, American Community Survey 2020-2024
Median household income
$94,811
Poverty rate
6.1%
Median home value
$180,600
Prices +1.2% in a year
Median rent
$1,046/mo
Homeownership
84.8%
Bachelor's or higher
32.9%
Median age
42.8
Average commute
24.0 min
Largest reported origins and ancestries: German Americans (3,930), Irish Americans (2,305), Scottish Americans (376).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.8%
Sep 2026, -0.8 pts in a year
Average annual pay
$50,198
3,776 jobs, 2025
Income per person
$70,960
BEA, 2024
Federal spending
$116M
FY 2026, $6,938 per person
PPP loans
$24.7M
647 loans, 2,757 jobs reported
Campaign donations
$116K
Itemized, 2026 cycle
How people get to work
Piatt County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone84.6%
- Carpooled5.7%
- Public transit0.1%
- Walked1.7%
- Bicycle0.1%
- Taxi, ride-hailing, motorcycle or other0.5%
- Worked from home7.3%
Average one-way commute: 24.0 minutes for people who do not work from home.
Environment and hazard risk
Piatt County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Very Low
Top: drought
Storm events since 1996
312
Most often thunderstorm wind
Flood insurance policies
26
0.4% of homes, county
July high / Jan low
84° / 17°F
39.6 inches of rain a year
Hazards, floods and storm historyCheck a flood zone1 historic places
Health statistics
Share of adults in Piatt County, IL, CDC PLACES estimates
Obesity
35.1%
U.S. 33.3% +1.8 pts
Diabetes
10.9%
U.S. 12.1% -1.2 pts
Smoking
12.5%
U.S. 12.8% about the same
Uninsured (18-64)
6.2%
U.S. 11.1% -4.9 pts
Cities, towns and ZIP codes in Piatt County
Population shown
Frequently asked questions
- What is the largest city in Piatt County, IL?
- Monticello is the largest city or town in Piatt County, with about 6,304 residents.
- How many ZIP codes are in Piatt County?
- Piatt County includes 11 ZIP Code Tabulation Areas, including 61813, 61818, 61830, 61839, 61854.
- What is the population of Piatt County, IL?
- About 16,695 people live in Piatt County, based on American Community Survey 5-year estimates.
- What counties border Piatt County?
- Piatt County borders Champaign County, McLean County, Macon County, Douglas County, De Witt County, Moultrie County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023