3,757 people (2024 Census estimate, +2.4% since 2020)
1,856 square miles of land · 2 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.
3 active community water systems list Sweet Grass County in the area they serve, reporting 1,760 people served in all (a system that crosses county lines counts its whole population).
| BIG TIMBER CITY OF surface water · local government · MT0000463 | 1,650 served |
| STROBEL TRAILER COURT groundwater · private · MT0000125 | 60 served |
| COTTONWOOD ESTATES groundwater · private · MT0004006 | 50 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 1 people were held in Sweet Grass County's jail, in Vera's latest figure (1998), or 50 per 100,000 residents ages 15–64. In 1993 it was about 1.
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.
5 school districts have their office in Sweet Grass County. School taxes are usually the largest part of a property tax bill.
Spent $3.6 million — $3.5 million to run schools, about $10,852 per student, plus $142,000 on buildings and equipment. Money in: $2 million local (mostly property tax), $1.4 million state, $329,000 federal. Long-term debt: $17,000.
Spent $3.9 million — $3.6 million to run schools, about $22,106 per student, plus $219,000 on buildings and equipment. Money in: $2.6 million local (mostly property tax), $1 million state, $426,000 federal. Long-term debt: $6,000.
Spent $363,000 — $335,000 to run schools, about $10,469 per student, plus $19,000 on buildings and equipment. Money in: $164,000 local (mostly property tax), $176,000 state, $60,000 federal. Long-term debt: $1,000.
Spent $157,000 — $153,000 to run schools, about $25,500 per student, plus $1,000 on buildings and equipment. Money in: $78,000 local (mostly property tax), $60,000 state, $51,000 federal.
Spent $170,000 — $167,000 to run schools, about $33,400 per student. Money in: $85,000 local (mostly property tax), $51,000 state, $45,000 federal.
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 Sweet Grass County about $5.9 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
94 bridges in Sweet Grass County: 30 in good condition, 58 fair, and 6 poor (6.4%). “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.
| S 91 over BOULDER RIVER OVERFLOW · built 1937 | 2,133 vehicles a day |
| US 191 over RYE CREEK · built 1947 | 661 vehicles a day |
| BOINTER RD over SWEET GRASS CREEK 044 · built 1970 | 100 vehicles a day |
| UPPER DEER CR RD over UPPER DEER CREEK 028 · built 1975 | 100 vehicles a day |
| MCLEOD MAIN ST over WEST BOULDER RIVER 025 · built 1912 | 100 vehicles a day |
| OLD US 10 over WORK CREEK 041 · built 1932 | 29 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $4.9 million of work in Sweet Grass County in fiscal 2025, about $1,340 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 Sweet Grass 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 Sweet Grass County built: brayden.ozark@gmail.com.
More of Montana: the state government and every county in Montana.
Nearby counties: Stillwater County (29 mi) · Park County (37 mi) · Wheatland County (47 mi) · Golden Valley County (54 mi) · Carbon County (60 mi) · Gallatin County (62 mi).