11,417 people (2024 Census estimate, −4.3% since 2020)
543 square miles of land · 21 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.
10 active community water systems list Greene County in the area they serve, reporting 12,516 people served in all (a system that crosses county lines counts its whole population).
| GREENE COUNTY RWD buys groundwater · local government · IL0610020 | 3,786 served |
| CARROLLTON groundwater · local government · IL0610050 | 2,513 served |
| WHITE HALL groundwater · local government · IL0610400 | 2,313 served |
| ROODHOUSE groundwater · local government · IL0610350 | 1,753 served |
| GREENFIELD surface water · local government · IL0610150 | 1,097 served |
| PATTERSON (INC AS WILMINGTON) buys groundwater · local government · IL0610450 | 320 served |
| KANE buys groundwater · local government · IL0610250 | 296 served |
| ROCKBRIDGE buys groundwater · local government · IL0610300 | 180 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 19 people were held in Greene County's jail, in Vera's latest figure (2019), or 250 per 100,000 residents ages 15–64. In 2014 it was about 11.
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.
3 school districts have their office in Greene County. School taxes are usually the largest part of a property tax bill.
Spent $17.3 million — $11.7 million to run schools, about $14,071 per student, plus $3.9 million on buildings and equipment. Money in: $4.5 million local (mostly property tax), $8.9 million state, $4.3 million federal. Long-term debt: $9.1 million.
Spent $8.4 million — $7 million to run schools, about $14,200 per student, plus $811,000 on buildings and equipment. Money in: $3.1 million local (mostly property tax), $4.9 million state, $1.3 million federal. Long-term debt: $2.8 million.
Spent $8.3 million — $7.7 million to run schools, about $17,958 per student, plus $236,000 on buildings and equipment. Money in: $3.8 million local (mostly property tax), $3.3 million state, $1.3 million federal. Long-term debt: $2.6 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 Greene County about $6.1 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.
162 bridges in Greene County: 82 in good condition, 69 fair, and 11 poor (6.8%). “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.
| US 67 over MACOUPIN CREEK · built 1969 | 4,750 vehicles a day |
| IL-16 & 100 over Illinois River & TR-423 · built 1930 | 2,250 vehicles a day |
| FAS 740 CH 6 over BEAR CREEK · built 2006 | 250 vehicles a day |
| FAS 1739 over HURRICANE CREEK · built 1994 | 200 vehicles a day |
| MSS 5090A over SEMINARY CK · built 1901 | 175 vehicles a day |
| TR 258 over STREAM · built 1901 | 150 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.8 million of work in Greene County in fiscal 2025, about $151 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 Greene 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 Greene County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Jersey County (19 mi) · Calhoun County (20 mi) · Scott County (20 mi) · Macoupin County (25 mi) · Morgan County (27 mi) · Pike County (33 mi).