126,984 people (2024 Census estimate, +6.2% since 2020)
2,605 square miles of land · 49 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.
64 active community water systems list Gallatin County in the area they serve, reporting 100,560 people served in all (a system that crosses county lines counts its whole population).
| BOZEMAN CITY OF surface water · local government · MT0000161 | 56,000 served |
| BELGRADE CITY OF groundwater · local government · MT0000136 | 10,460 served |
| WEST YELLOWSTONE TOWN OF groundwater · local government · MT0003136 | 9,899 served |
| NORTH STAR ZOOT WATER groundwater · private · MT0004284 | 4,323 served |
| RIVER ROCK COUNTY WATER AND SEWER DIST groundwater · private · MT0004082 | 4,200 served |
| RAE WATER AND SEWER DIST 313 groundwater · local government · MT0000628 | 2,325 served |
| THREE FORKS CITY OF groundwater · local government · MT0000343 | 1,900 served |
| MANHATTAN TOWN OF groundwater · local government · MT0000285 | 1,800 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 137 people were held in Gallatin County's jail, in Vera's latest figure (2019), or 165 per 100,000 residents ages 15–64. In 2014 it was about 153.
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.
21 school districts have their office in Gallatin County. School taxes are usually the largest part of a property tax bill.
Spent $54 million — $50.4 million to run schools, about $10,840 per student, plus $381,000 on buildings and equipment. Money in: $31.7 million local (mostly property tax), $22.9 million state, $3.8 million federal. Long-term debt: $63.4 million.
Spent $42.7 million — $36.3 million to run schools, about $13,794 per student, plus $945,000 on buildings and equipment. Money in: $34.4 million local (mostly property tax), $13.5 million state, $993,000 federal. Long-term debt: $156.6 million.
Spent $37.1 million — $27.5 million to run schools, about $11,571 per student, plus $7 million on buildings and equipment. Money in: $15.5 million local (mostly property tax), $12.7 million state, $4.9 million federal. Long-term debt: $41.2 million.
Spent $12.4 million — $10.9 million to run schools, about $10,923 per student, plus $709,000 on buildings and equipment. Money in: $8.5 million local (mostly property tax), $6.3 million state, $42,000 federal. Long-term debt: $23.3 million.
Spent $7 million — $6.3 million to run schools, about $9,357 per student, plus $140,000 on buildings and equipment. Money in: $4.2 million local (mostly property tax), $3.3 million state, $481,000 federal. Long-term debt: $15.1 million.
Spent $10.7 million — $5.8 million to run schools, about $11,141 per student, plus $4.7 million on buildings and equipment. Money in: $2.6 million local (mostly property tax), $3 million state, $1.3 million federal. Long-term debt: $9.6 million.
Spent $5.7 million — $5.4 million to run schools, about $11,112 per student, plus $115,000 on buildings and equipment. Money in: $2.6 million local (mostly property tax), $2.9 million state, $541,000 federal. Long-term debt: $7.1 million.
Spent $20.9 million — $6.7 million to run schools, about $15,410 per student, plus $13 million on buildings and equipment. Money in: $8.6 million local (mostly property tax), $1.9 million state, $166,000 federal.
And 13 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 Gallatin County about $65.8 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.
212 bridges in Gallatin County: 43 in good condition, 157 fair, and 12 poor (5.7%). “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 ABANDONED RR · built 1969 | 8,575 vehicles a day |
| US 191 FH 42 over TEEPEE CREEK · built 1962 | 2,605 vehicles a day |
| US 191 over GRAYLING CREEK · built 1962 | 2,605 vehicles a day |
| W DRY CREEK RD over BAKER CREEK · built 1967 | 1,287 vehicles a day |
| AXTELL ANCENY RD over GALLATIN RIVER 084 · built 1919 | 569 vehicles a day |
| OLD TOWN RD over JEFFERSON RIVER 004 · built 1897 | 100 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $153.7 million of work in Gallatin County in fiscal 2025, about $1,292 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 Gallatin 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 Gallatin County built: brayden.ozark@gmail.com.
More of Montana: the state government and every county in Montana.
Nearby counties: Park County (31 mi) · Madison County (39 mi) · Broadwater County (58 mi) · Jefferson County (60 mi) · Sweet Grass County (62 mi) · Meagher County (75 mi).