12,084 people (2024 Census estimate, +5.3% since 2020)
3,137 square miles of land · 4 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.
15 active community water systems list Big Horn County in the area they serve, reporting 9,099 people served in all (a system that crosses county lines counts its whole population).
| LOVELL, TOWN OF buys surface water · local government · WY5600031 | 2,250 served |
| GREYBULL, TOWN OF groundwater · local government · WY5600022 | 2,080 served |
| BASIN, TOWN OF buys groundwater · local government · WY5600004 | 1,250 served |
| SOUTH BIG HORN COUNTY JPB groundwater · local government · WY5601454 | 900 served |
| COWLEY, TOWN OF groundwater · local government · WY5600206 | 800 served |
| BYRON, TOWN OF buys surface water · local government · WY5600008 | 561 served |
| BURLINGTON, TOWN OF buys groundwater · local government · WY5601098 | 348 served |
| DEAVER MUNICIPAL WATER SYSTEM buys surface water · local government · WY5600016 | 176 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 50 people were held in Big Horn County's jail, in Vera's latest figure (2022), or 717 per 100,000 residents ages 15–64. In 2017 it was about 79.
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.
4 school districts have their office in Big Horn County. School taxes are usually the largest part of a property tax bill.
Spent $25.8 million — $24.3 million to run schools, about $19,661 per student, plus $1.3 million on buildings and equipment. Money in: $5 million local (mostly property tax), $17.3 million state, $2.9 million federal.
Spent $15.4 million — $13.6 million to run schools, about $18,681 per student, plus $1.7 million on buildings and equipment. Money in: $3.2 million local (mostly property tax), $9.6 million state, $1.9 million federal.
Spent $12.5 million — $10.6 million to run schools, about $22,627 per student, plus $1.9 million on buildings and equipment. Money in: $4.1 million local (mostly property tax), $5.4 million state, $2.6 million federal.
Spent $8.7 million — $7.3 million to run schools, about $31,115 per student, plus $324,000 on buildings and equipment. Money in: $2.3 million local (mostly property tax), $4.8 million state, $1.4 million 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 Big Horn County about $8.9 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.
91 bridges in Big Horn County: 25 in good condition, 57 fair, and 9 poor (9.9%). “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 14A over Sand Draw · built 1975 | 1,578 vehicles a day |
| WYO 31 over Nowood River · built 1951 | 688 vehicles a day |
| Bh Cnty Rd 229 over Elk Creek · built 1940 | 343 vehicles a day |
| Bh Cnty Rd 268 over Medicine Lodge Creek · built 1970 | 189 vehicles a day |
| Bh Cnty Rd 72 over Shoshone River · built 1926 | 119 vehicles a day |
| Bh Cnty Rd L55 over Big Horn River · built 1930 | 88 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $13 million of work in Big Horn County in fiscal 2025, about $1,131 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 Wyoming 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 Big Horn 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 Big Horn County built: brayden.ozark@gmail.com.
More of Wyoming: the state government and every county in Wyoming.
Nearby counties: Washakie County (47 mi) · Sheridan County (58 mi) · Hot Springs County (60 mi) · Big Horn County, MT (65 mi) · Carbon County, MT (70 mi) · Johnson County (77 mi).