3,448 people (2024 Census estimate, −2.5% since 2020)
1,677 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.
5 active community water systems list Sheridan County in the area they serve, reporting 2,627 people served in all (a system that crosses county lines counts its whole population).
| PLENTYWOOD WATER DEPARTMENT buys surface water · local government · MT0000306 | 1,700 served |
| MEDICINE LAKE TOWN OF buys surface water · local government · MT0000289 | 600 served |
| WESTBY TOWN OF buys surface water · local government · MT0000355 | 172 served |
| OUTLOOK COUNTY SEWER AND WATER groundwater · local government · MT0003312 | 96 served |
| ANTELOPE COUNTY WATER AND SEWER buys surface water · local government · MT0003203 | 59 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 Sheridan County's jail, in Vera's latest figure (2019), or 47 per 100,000 residents ages 15–64. In 2014 it was about 2.
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.
3 school districts have their office in Sheridan County. School taxes are usually the largest part of a property tax bill.
Spent $5.9 million — $5.3 million to run schools, about $14,367 per student, plus $349,000 on buildings and equipment. Money in: $3.2 million local (mostly property tax), $2.6 million state, $639,000 federal. Long-term debt: $3.3 million.
Spent $3.6 million — $3.1 million to run schools, about $36,702 per student, plus $425,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $1.2 million state, $249,000 federal.
Spent $1.7 million — $1.7 million to run schools, about $34,040 per student. Money in: $920,000 local (mostly property tax), $1.3 million state, $62,000 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 Sheridan County about $5 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
66 bridges in Sheridan County: 11 in good condition, 52 fair, and 3 poor (4.5%). “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 5 over DAHL CREEK · built 1939 | 309 vehicles a day |
| S 5 over MAIN CREEK · built 1939 | 309 vehicles a day |
| W LAKE RD over BIG MUDDY CREEK 046 · built 1950 | 79 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $2.2 million of work in Sheridan County in fiscal 2025, about $617 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 Sheridan 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 Sheridan County built: brayden.ozark@gmail.com.
More of Montana: the state government and every county in Montana.
Nearby counties: Roosevelt County (36 mi) · Daniels County (46 mi) · Divide County, ND (47 mi) · Williams County, ND (53 mi) · Richland County (63 mi) · McKenzie County, ND (84 mi).