122,546 people (2024 Census estimate, +3.5% since 2020)
2,593 square miles of land · 47 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.
85 active community water systems list Missoula County in the area they serve, reporting 86,092 people served in all (a system that crosses county lines counts its whole population).
| MISSOULA WATER groundwater · local government · MT0000294 | 68,200 served |
| LOLO WATER AND SEWER DIST groundwater · local government · MT0000278 | 3,315 served |
| SEELEY LAKE WATER DISTRICT surface water · local government · MT0000327 | 1,575 served |
| EL MAR ESTATES MSLA CO WATER groundwater · private · MT0000517 | 1,350 served |
| WESTVIEW MOBILE HOME PARK groundwater · private · MT0000437 | 947 served |
| PHANTOM HILLS WATER SYSTEM groundwater · private · MT0004379 | 810 served |
| TRAVOIS VILLAGE MOBILE PARK buys groundwater · private · MT0003909 | 702 served |
| GREENFIELD MOBILE HOME PARK groundwater · private · MT0000373 | 620 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 343 people were held in Missoula County's jail, in Vera's latest figure (2023), or 414 per 100,000 residents ages 15–64. In 2018 it was about 361.
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.
14 school districts have their office in Missoula County. School taxes are usually the largest part of a property tax bill.
Spent $76.1 million — $70.8 million to run schools, about $13,401 per student, plus $2.3 million on buildings and equipment. Money in: $34 million local (mostly property tax), $30.9 million state, $12.6 million federal. Long-term debt: $106.8 million.
Spent $57.5 million — $52.1 million to run schools, about $13,142 per student, plus $2.1 million on buildings and equipment. Money in: $30 million local (mostly property tax), $24 million state, $7.1 million federal. Long-term debt: $64.6 million.
Spent $18.3 million — $16.7 million to run schools, about $11,166 per student, plus $585,000 on buildings and equipment. Money in: $10.2 million local (mostly property tax), $9 million state, $2.3 million federal. Long-term debt: $24.4 million.
Spent $17 million — $16.3 million to run schools, about $11,281 per student, plus $527,000 on buildings and equipment. Money in: $7.1 million local (mostly property tax), $9.5 million state, $2.2 million federal. Long-term debt: $6.5 million.
Spent $6.2 million — $6 million to run schools, about $10,371 per student, plus $286,000 on buildings and equipment. Money in: $2.5 million local (mostly property tax), $3.3 million state, $849,000 federal. Long-term debt: $112,000.
Spent $25.2 million — $6.5 million to run schools, about $12,874 per student, plus $17.4 million on buildings and equipment. Money in: $7.7 million local (mostly property tax), $3.5 million state, $1.1 million federal. Long-term debt: $24.4 million.
Spent $5.8 million — $4.9 million to run schools, about $13,657 per student, plus $860,000 on buildings and equipment. Money in: $2 million local (mostly property tax), $2.6 million state, $1.7 million federal. Long-term debt: $324,000.
Spent $3.2 million — $2.7 million to run schools, about $12,631 per student, plus $103,000 on buildings and equipment. Money in: $1.6 million local (mostly property tax), $1.3 million state, $667,000 federal. Long-term debt: $3.8 million.
And 6 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 Low compared with other U.S. counties. FEMA estimates natural hazards cost Missoula County about $56.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
206 bridges in Missoula County: 66 in good condition, 125 fair, and 15 poor (7.3%). “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 90 over INT RESERVE STREET · built 1966 | 13,664 vehicles a day |
| I 90 over CLARK FORK RIVER · built 1964 | 9,168 vehicles a day |
| LOLO ST over RATTLESNAKE CREEK 009 · built 1966 | 2,363 vehicles a day |
| MULLAN RD over IRRIGATION CANAL · built 1970 | 1,635 vehicles a day |
| S 474 over RR · built 1959 | 1,397 vehicles a day |
| US 12 FH 11 over LOLO CREEK · built 1957 | 799 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $91.2 million of work in Missoula County in fiscal 2025, about $774 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 Montana 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 Missoula 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 Missoula County built: brayden.ozark@gmail.com.
More of Montana: the state government and every county in Montana.
Nearby counties: Lake County (43 mi) · Powell County (47 mi) · Granite County (49 mi) · Mineral County (57 mi) · Ravalli County (66 mi) · Lewis and Clark County (71 mi).