27,615 people (2024 Census estimate, −2.2% since 2020)
704 square miles of land · 39 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.
18 active community water systems list Montgomery County in the area they serve, reporting 25,813 people served in all (a system that crosses county lines counts its whole population).
| LITCHFIELD surface water · local government · IL1350400 | 6,648 served |
| HILLSBORO surface water · local government · IL1350300 | 4,402 served |
| NOKOMIS groundwater · local government · IL1350450 | 2,370 served |
| GRAHAM CORRECTIONAL SITE buys surface water · state · IL1355100 | 2,155 served |
| EJ WATER-MCWC buys surface water · private · IL1350020 | 2,083 served |
| HENDERSON PWD buys surface water · local government · IL1350010 | 2,045 served |
| RAYMOND groundwater · local government · IL1350550 | 974 served |
| EJ WATER-WITT buys surface water · local government · IL1350850 | 785 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 42 people were held in Montgomery County's jail, in Vera's latest figure (2023), or 243 per 100,000 residents ages 15–64. In 2018 it was about 37.
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 Montgomery County. School taxes are usually the largest part of a property tax bill.
Spent $27.4 million — $23.8 million to run schools, about $14,653 per student, plus $1.6 million on buildings and equipment. Money in: $11.6 million local (mostly property tax), $17.1 million state, $3.3 million federal. Long-term debt: $4 million.
Spent $36.8 million — $21.8 million to run schools, about $16,533 per student, plus $13.3 million on buildings and equipment. Money in: $9.9 million local (mostly property tax), $16.9 million state, $4.5 million federal. Long-term debt: $22.1 million.
Spent $12 million — $8.9 million to run schools, about $14,862 per student, plus $2.5 million on buildings and equipment. Money in: $4 million local (mostly property tax), $6.1 million state, $2.7 million federal. Long-term debt: $3.9 million.
Spent $9.2 million — $7.9 million to run schools, about $17,676 per student, plus $836,000 on buildings and equipment. Money in: $5 million local (mostly property tax), $3.9 million state, $1.1 million federal. Long-term debt: $2.2 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Montgomery County about $22.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
261 bridges in Montgomery County: 135 in good condition, 116 fair, and 10 poor (3.8%). “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.
| MS-1070 Seward St over Ditch · built 1920 | 1,350 vehicles a day |
| TR 408 over CREEK · built 1900 | 150 vehicles a day |
| TR 199 over STREAM · built 1900 | 75 vehicles a day |
| TR 314 over MDL FK SHOAL CR · built 1969 | 75 vehicles a day |
| TR 17 over I-55 · built 1970 | 50 vehicles a day |
| TR 457 over DRY FORK CRK. · built 1954 | 50 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $10.2 million of work in Montgomery County in fiscal 2025, about $361 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 Montgomery 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 Montgomery County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Bond County (24 mi) · Macoupin County (24 mi) · Christian County (24 mi) · Fayette County (29 mi) · Madison County (36 mi) · Sangamon County (38 mi).