25,261 people (2024 Census estimate, +3.8% since 2020)
2,638 square miles of land · 10 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.
22 active community water systems list Blaine County in the area they serve, reporting 21,097 people served in all (a system that crosses county lines counts its whole population).
| HAILEY WATER AND SEWER groundwater · private · ID5070022 | 8,000 served |
| KETCHUM CITY OF groundwater · local government · ID5070028 | 3,555 served |
| SUN VALLEY WATER AND SEWER DIST groundwater · public/private · ID5070051 | 3,400 served |
| BELLEVUE CITY OF groundwater · local government · ID5070004 | 2,747 served |
| CAREY CITY OF groundwater · local government · ID5070010 | 993 served |
| MID VALLEY WATER COMPANY LLC groundwater · private · ID5070038 | 450 served |
| HULEN MEADOWS WATER COMPANY groundwater · private · ID5070026 | 390 served |
| COLD SPRINGS SUBD groundwater · private · ID5070015 | 300 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 7 people were held in Blaine County's jail, in Vera's latest figure (2021), or 45 per 100,000 residents ages 15–64. In 2016 it was about 47.
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.
1 school district has its office in Blaine County. School taxes are usually the largest part of a property tax bill.
Spent $64.7 million — $63.1 million to run schools, about $19,043 per student, plus $1.6 million on buildings and equipment. Money in: $39.2 million local (mostly property tax), $23.1 million state, $4.4 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Blaine County about $28.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Low; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
96 bridges in Blaine County: 27 in good condition, 65 fair, and 4 poor (4.2%). “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.
| KILPATRICK BR. RD. over SILVER CREEK · built 1978 | 60 vehicles a day |
| FDR over NORTH FORK OF WOOD RIVER · built 1955 | 50 vehicles a day |
| PR over NORTH FORK WOOD RIVER · built 1950 | 50 vehicles a day |
| OLD HIGHWAY 93 over RICHFIELD CANAL · built 1932 | 10 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $49.1 million of work in Blaine County in fiscal 2025, about $2,024 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 Idaho 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 Blaine 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 Blaine County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Lincoln County (30 mi) · Minidoka County (40 mi) · Camas County (42 mi) · Butte County (44 mi) · Jerome County (51 mi) · Gooding County (52 mi).