17,912 people (2024 Census estimate, +8.0% since 2020)
8,477 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.
18 active community water systems list Idaho County in the area they serve, reporting 7,586 people served in all (a system that crosses county lines counts its whole population).
| GRANGEVILLE WATER DEPT groundwater · local government · ID2250023 | 3,151 served |
| COTTONWOOD WATER DEPT groundwater · local government · ID2250013 | 977 served |
| KOOSKIA WATER DEPT groundwater · local government · ID2250032 | 514 served |
| RIGGINS CITY OF groundwater · local government · ID2250053 | 434 served |
| IDOC NORTH IDAHO CORRECTIONAL INSTITUTE groundwater · state · ID2250041 | 425 served |
| PINE RIDGE WATER AND SEWER DIST buys surface water · public/private · ID2250134 | 390 served |
| ELK CITY WATER AND SEWER ASSN surface water · private · ID2250017 | 320 served |
| STITES CITY OF groundwater · local government · ID2250060 | 253 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 12 people were held in Idaho County's jail, in Vera's latest figure (2019), or 130 per 100,000 residents ages 15–64. In 2014 it was about 15.
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 Idaho County. School taxes are usually the largest part of a property tax bill.
Spent $14.1 million — $13.6 million to run schools, about $12,252 per student, plus $471,000 on buildings and equipment. Money in: $1.2 million local (mostly property tax), $9.9 million state, $3.2 million federal.
Spent $5.3 million — $5.1 million to run schools, about $11,565 per student, plus $164,000 on buildings and equipment. Money in: $902,000 local (mostly property tax), $4.2 million state, $979,000 federal.
Spent $3.7 million — $3.6 million to run schools, about $25,557 per student, plus $76,000 on buildings and equipment. Money in: $1.1 million local (mostly property tax), $1.9 million state, $540,000 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Idaho County about $31.2 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
216 bridges in Idaho County: 87 in good condition, 114 fair, and 15 poor (6.9%). “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.
| SH 13B over M.F.CLWATER R.;E.KOOSKIA · built 1935 | 980 vehicles a day |
| STC4705;DOUMECQ RD over SALMON R;WHITEBIRD TRUSS · built 1935 | 550 vehicles a day |
| ROCK CREEK ROAD over RED ROCK CREEK · built 1970 | 200 vehicles a day |
| CROOKED RIVER ROAD over UPPER CROOKED RIVER · built 1965 | 110 vehicles a day |
| FDR 500 over ELDORADO CREEK · built 1967 | 99 vehicles a day |
| FOREST ROAD 2038 over SLATE CREEK · built 1953 | 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 Idaho County in fiscal 2025, about $374 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 Idaho 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 Idaho County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Lewis County (53 mi) · Clearwater County (57 mi) · Ravalli County, MT (67 mi) · Valley County (69 mi) · Nez Perce County (71 mi) · Adams County (82 mi).