537,443 people (2024 Census estimate, +0.1% since 2020)
461 square miles of land · 1,165 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.
23 active community water systems list Montgomery County in the area they serve, reporting 509,292 people served in all (a system that crosses county lines counts its whole population).
| MONTGOMERY COUNTY WATER SERVICES 1 PWS buys surface water · local government · OH5701315 | 150,207 served |
| DAYTON PUBLIC WATER SYSTEM surface water · local government · OH5703512 | 141,407 served |
| MONTGOMERY COUNTY WATER SERVICES 2 PWS buys surface water · local government · OH5701503 | 83,033 served |
| HUBER HEIGHTS PUBLIC WATER SYSTEM groundwater · private · OH5703612 | 43,439 served |
| MIAMISBURG CITY PWS groundwater · local government · OH5701212 | 19,790 served |
| ENGLEWOOD CITY PWS groundwater · local government · OH5700812 | 13,463 served |
| OAKWOOD CITY PWS groundwater · local government · OH5701915 | 9,572 served |
| TROTWOOD CITY PWS buys surface water · local government · OH5702403 | 9,000 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 579 people were held in Montgomery County's jail, in Vera's latest figure (2023), or 172 per 100,000 residents ages 15–64. In 2018 it was about 811.
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.
17 school districts have their office in Montgomery County. School taxes are usually the largest part of a property tax bill.
Spent $294.8 million — $250.5 million to run schools, about $20,743 per student, plus $31.1 million on buildings and equipment. Money in: $101.7 million local (mostly property tax), $131.2 million state, $67 million federal. Long-term debt: $118.5 million.
Spent $133.3 million — $125.3 million to run schools, about $15,153 per student, plus $4.2 million on buildings and equipment. Money in: $104.4 million local (mostly property tax), $24.8 million state, $7.9 million federal. Long-term debt: $39.9 million.
Spent $132.4 million — $124.5 million to run schools, about $16,037 per student, plus $2 million on buildings and equipment. Money in: $98 million local (mostly property tax), $31.8 million state, $13.5 million federal. Long-term debt: $73.3 million.
Spent $91.5 million — $80.4 million to run schools, about $13,612 per student, plus $10.3 million on buildings and equipment. Money in: $38.1 million local (mostly property tax), $39.1 million state, $17.7 million federal. Long-term debt: $80.2 million.
Spent $73.4 million — $66.5 million to run schools, about $13,261 per student, plus $3.5 million on buildings and equipment. Money in: $45.5 million local (mostly property tax), $21.8 million state, $10.2 million federal. Long-term debt: $62 million.
Spent $77.8 million — $73.9 million to run schools, about $15,714 per student, plus $2.2 million on buildings and equipment. Money in: $41.2 million local (mostly property tax), $28.7 million state, $6.9 million federal. Long-term debt: $48.1 million.
Spent $56.4 million — $54 million to run schools, about $14,359 per student, plus $1 million on buildings and equipment. Money in: $13.2 million local (mostly property tax), $34.1 million state, $11.5 million federal. Long-term debt: $3.2 million.
Spent $65.4 million — $53.4 million to run schools, about $15,940 per student, plus $8.9 million on buildings and equipment. Money in: $25.9 million local (mostly property tax), $29.9 million state, $9.7 million federal. Long-term debt: $41.1 million.
And 9 more.
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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Montgomery County about $119.2 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.
633 bridges in Montgomery County: 432 in good condition, 183 fair, and 18 poor (2.8%). “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.
| Woodman M0074 over Lilly Creek · built 1961 | 27,017 vehicles a day |
| Shoup Mill Rd. over storm sewer · built 1968 | 26,981 vehicles a day |
| Alex Bell C0078 over Drainage Ditch · built 1968 | 17,158 vehicles a day |
| Wenger Road M020B over Moss Creek · built 1988 | 11,575 vehicles a day |
| Diamond Mill C217 over Bear Creek · built 1957 | 2,651 vehicles a day |
| STOP EIGHT RD-T108 over I75 POE AVENUE · built 1971 | 2,438 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $169.9 million of work in Montgomery County in fiscal 2025, about $316 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 Ohio 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 Ohio: the state government and every county in Ohio.
Nearby counties: Preble County (19 mi) · Miami County (21 mi) · Greene County (21 mi) · Warren County (24 mi) · Butler County (26 mi) · Clark County (29 mi).