16,628 people (2024 Census estimate, −0.3% since 2020)
439 square miles of land · 38 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
9 active community water systems list Piatt County in the area they serve, reporting 11,442 people served in all (a system that crosses county lines counts its whole population).
| MONTICELLO groundwater · local government · IL1470350 | 5,548 served |
| BEMENT groundwater · local government · IL1470050 | 1,661 served |
| CERRO GORDO groundwater · local government · IL1470100 | 1,350 served |
| MANSFIELD groundwater · local government · IL1470300 | 939 served |
| WHITE HEATH WATERWORKS groundwater · private · IL1475050 | 685 served |
| HAMMOND groundwater · local government · IL1470250 | 478 served |
| DE LAND groundwater · local government · IL1470200 | 446 served |
| CISCO groundwater · local government · IL1470150 | 242 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 21 people were held in Piatt County's jail, in Vera's latest figure (2019), or 202 per 100,000 residents ages 15–64. In 2014 it was about 26.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
4 school districts have their office in Piatt County. School taxes are usually the largest part of a property tax bill.
Spent $29.2 million — $23 million to run schools, about $13,831 per student, plus $4.4 million on buildings and equipment. Money in: $19.1 million local (mostly property tax), $29.3 million state, $1.2 million federal. Long-term debt: $32 million.
Spent $7.8 million — $6.5 million to run schools, about $14,113 per student, plus $917,000 on buildings and equipment. Money in: $5.7 million local (mostly property tax), $3.6 million state, $785,000 federal. Long-term debt: $11.8 million.
Spent $5.3 million — $5 million to run schools, about $17,095 per student, plus $159,000 on buildings and equipment. Money in: $6.1 million local (mostly property tax), $1.8 million state, $275,000 federal. Long-term debt: $3.5 million.
Spent $4.4 million — $3.8 million to run schools, about $22,243 per student, plus $271,000 on buildings and equipment. Money in: $5.3 million local (mostly property tax), $1.4 million state, $527,000 federal. Long-term debt: $5.3 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Piatt County about $12.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
246 bridges in Piatt County: 137 in good condition, 95 fair, and 14 poor (5.7%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| I-72 (EB) over Norfolk Southern Railway · built 1975 | 5,450 vehicles a day |
| I-72 (WB) over Norfolk Southern Railway · built 1975 | 5,450 vehicles a day |
| ILL 10(FAP 721) over W BR GOOSE CREEK · built 1977 | 1,600 vehicles a day |
| SBI 10 (FAS 1532) over I-72 · built 1962 | 925 vehicles a day |
| CH 12 over STREAM · built 1939 | 250 vehicles a day |
| TR 27 over MADDEN CREEK · built 1962 | 150 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $-9,785,576 of work in Piatt County in fiscal 2025, about $-587 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for Illinois are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Piatt County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Piatt County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: De Witt County (20 mi) · Macon County (22 mi) · Champaign County (23 mi) · Douglas County (26 mi) · Moultrie County (26 mi) · McLean County (36 mi).