26,067 people (2024 Census estimate, −3.3% since 2020)
1,117 square miles of land · 23 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.
26 active community water systems list Iroquois County in the area they serve, reporting 20,333 people served in all (a system that crosses county lines counts its whole population).
| WATSEKA groundwater · local government · IL0750900 | 4,767 served |
| GILMAN groundwater · local government · IL0750450 | 1,793 served |
| CLIFTON groundwater · local government · IL0750250 | 1,500 served |
| ONARGA groundwater · local government · IL0750700 | 1,409 served |
| MILFORD groundwater · local government · IL0750650 | 1,306 served |
| CHEBANSE groundwater · local government · IL0754240 | 1,044 served |
| SHELDON groundwater · local government · IL0750800 | 900 served |
| CISSNA PARK groundwater · local government · IL0750200 | 846 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 Iroquois County's jail, in Vera's latest figure (2023), or 135 per 100,000 residents ages 15–64. In 2018 it was about 24.
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.
7 school districts have their office in Iroquois County. School taxes are usually the largest part of a property tax bill.
Spent $18.4 million — $15.3 million to run schools, about $15,416 per student, plus $2 million on buildings and equipment. Money in: $8.9 million local (mostly property tax), $8.4 million state, $2.2 million federal. Long-term debt: $6.5 million.
Spent $15.4 million — $13.3 million to run schools, about $15,006 per student, plus $244,000 on buildings and equipment. Money in: $5.6 million local (mostly property tax), $9.8 million state, $1.5 million federal. Long-term debt: $1.1 million.
Spent $18 million — $13.8 million to run schools, about $15,618 per student, plus $1.7 million on buildings and equipment. Money in: $5.3 million local (mostly property tax), $10.4 million state, $2.5 million federal. Long-term debt: $456,000.
Spent $13 million — $10.3 million to run schools, about $19,778 per student, plus $1 million on buildings and equipment. Money in: $6.7 million local (mostly property tax), $5.3 million state, $1.7 million federal. Long-term debt: $15.7 million.
Spent $7 million — $4.8 million to run schools, about $16,529 per student, plus $1.7 million on buildings and equipment. Money in: $3.4 million local (mostly property tax), $2.7 million state, $896,000 federal. Long-term debt: $325,000.
Spent $4.9 million — $4.1 million to run schools, about $14,700 per student, plus $290,000 on buildings and equipment. Money in: $2.7 million local (mostly property tax), $2.2 million state, $293,000 federal. Long-term debt: $250,000.
Spent $2.4 million — $1.8 million to run schools, about $26,882 per student, plus $120,000 on buildings and equipment. Money in: $1.6 million local (mostly property tax), $718,000 state, $300,000 federal.
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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Iroquois County about $33.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
568 bridges in Iroquois County: 258 in good condition, 227 fair, and 83 poor (14.6%). “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.
| FAI-57 NB over IC RR · built 1967 | 9,050 vehicles a day |
| FAI-57 SB over T.P. & W RR · built 1967 | 9,050 vehicles a day |
| FAI-57 SB over WEST SECOND ST · built 1967 | 9,050 vehicles a day |
| FAI-57 NB over PRAIRIE CR · built 1967 | 9,050 vehicles a day |
| FAI-57 SB over PRAIRIE CREEK · built 1967 | 9,050 vehicles a day |
| FAI-57 SB over Louis Creek · built 1968 | 8,750 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $17 million of work in Iroquois County in fiscal 2025, about $627 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 Iroquois 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 Iroquois County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Ford County (23 mi) · Newton County, IN (27 mi) · Kankakee County (27 mi) · Benton County, IN (29 mi) · Warren County, IN (36 mi) · Livingston County (39 mi).