9,753 people (2024 Census estimate, +12.6% since 2020)
3,588 square miles of land · 3 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.
12 active community water systems list Madison County in the area they serve, reporting 9,615 people served in all (a system that crosses county lines counts its whole population).
| BIG SKY COUNTY WATER AND SEWER DIST 363 groundwater · local government · MT0002385 | 4,132 served |
| VIRGINIA CITY WATER DEPT groundwater · local government · MT0000353 | 1,500 served |
| ENNIS TOWN OF groundwater · local government · MT0000208 | 1,400 served |
| SHERIDAN TOWN OF groundwater · local government · MT0000329 | 632 served |
| ANDESITE RIDGE WATER SYSTEM buys groundwater · private · MT0004468 | 450 served |
| TWIN BRIDGES TOWN OF groundwater · local government · MT0000349 | 424 served |
| MT MOONLIGHT BASIN groundwater · private · MT0004023 | 355 served |
| LOWER PIONEER MOUNTAIN WATER SYSTEM groundwater · private · MT0004462 | 350 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 8 people were held in Madison County's jail, in Vera's latest figure (2019), or 165 per 100,000 residents ages 15–64. In 2014 it was about 10.
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.
6 school districts have their office in Madison County. School taxes are usually the largest part of a property tax bill.
Spent $6.5 million — $5.9 million to run schools, about $13,874 per student, plus $267,000 on buildings and equipment. Money in: $4.4 million local (mostly property tax), $1.8 million state, $408,000 federal.
Spent $4.3 million — $3.5 million to run schools, about $16,905 per student, plus $647,000 on buildings and equipment. Money in: $2.1 million local (mostly property tax), $1.6 million state, $539,000 federal. Long-term debt: $1.3 million.
Spent $2.3 million — $2.2 million to run schools, about $12,865 per student, plus $4,000 on buildings and equipment. Money in: $868,000 local (mostly property tax), $989,000 state, $495,000 federal. Long-term debt: $79,000.
Spent $2.1 million — $1.8 million to run schools, about $20,022 per student, plus $156,000 on buildings and equipment. Money in: $943,000 local (mostly property tax), $920,000 state, $331,000 federal. Long-term debt: $95,000.
Spent $1.7 million — $1.6 million to run schools, about $27,067 per student, plus $31,000 on buildings and equipment. Money in: $939,000 local (mostly property tax), $668,000 state, $17,000 federal. Long-term debt: $84,000.
Spent $372,000 — $299,000 to run schools, about $17,588 per student, plus $48,000 on buildings and equipment. Money in: $198,000 local (mostly property tax), $106,000 state, $82,000 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 Madison County about $15.3 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.
98 bridges in Madison County: 34 in good condition, 57 fair, and 7 poor (7.1%). “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.
| US 287 over SOUTH WILLOW CREEK · built 1934 | 4,102 vehicles a day |
| S 287 over WEBER IRRIGATION CANAL · built 1950 | 2,300 vehicles a day |
| JACK CREEK RD over JACK CREEK 028 · built 1952 | 301 vehicles a day |
| SILVER SPRING RD over RUBY RIVER 023 · built 1927 | 133 vehicles a day |
| SEYLER LN over RUBY RIVER 019 · built 1976 | 100 vehicles a day |
| RUBY RD over COTTONWOOD CR · 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 $6.2 million of work in Madison County in fiscal 2025, about $718 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 Madison 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 Madison County built: brayden.ozark@gmail.com.
More of Montana: the state government and every county in Montana.
Nearby counties: Gallatin County (39 mi) · Beaverhead County (49 mi) · Silver Bow County (54 mi) · Jefferson County (56 mi) · Park County (68 mi) · Broadwater County (72 mi).