42,847 people (2024 Census estimate, +1.7% since 2020)
848 square miles of land · 51 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 Nez Perce County in the area they serve, reporting 37,021 people served in all (a system that crosses county lines counts its whole population).
| LEWISTON ORCHARDS IRRIGATION DIST groundwater · private · ID2350015 | 20,000 served |
| LEWISTON CITY OF surface water · local government · ID2350014 | 15,001 served |
| RED PHEASANT WATER COMPANY LLC groundwater · private · ID2350040 | 480 served |
| CULDESAC CITY OF groundwater · local government · ID2350003 | 382 served |
| LAPWAI CITY OF groundwater · local government · ID2350011 | 325 served |
| PECK WATER SYSTEM surface water · local government · ID2350023 | 196 served |
| COUGAR RIDGE WATER & SEWER groundwater · public/private · ID2350036 | 173 served |
| EAGLES POINTE SUBDIVISION groundwater · private · ID2350038 | 154 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 140 people were held in Nez Perce County's jail, in Vera's latest figure (2023), or 532 per 100,000 residents ages 15–64. In 2018 it was about 115.
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 Nez Perce County. School taxes are usually the largest part of a property tax bill.
Spent $63 million — $58 million to run schools, about $12,176 per student, plus $2.9 million on buildings and equipment. Money in: $32.5 million local (mostly property tax), $33.9 million state, $7.1 million federal. Long-term debt: $44.9 million.
Spent $10.8 million — $10.7 million to run schools, about $20,539 per student, plus $73,000 on buildings and equipment. Money in: $658,000 local (mostly property tax), $4.5 million state, $5.8 million federal. Long-term debt: $810,000.
Spent $2.5 million — $2.4 million to run schools, about $20,957 per student, plus $108,000 on buildings and equipment. Money in: $374,000 local (mostly property tax), $1.9 million state, $331,000 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 Nez Perce County about $15.1 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.
72 bridges in Nez Perce County: 20 in good condition, 49 fair, and 3 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.
| LENORE GRADE ROAD over CLEARWATER R;LENORE BR. · built 1935 | 400 vehicles a day |
| MCINTYRE STREET over LAPWAI CREEK · built 1935 | 180 vehicles a day |
| HIGHLINE ARROW RD over POTLATCH R(ARROW JCT BR) · built 1920 | 90 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $30.8 million of work in Nez Perce County in fiscal 2025, about $732 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 Nez Perce 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 Nez Perce County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Lewis County (17 mi) · Asotin County, WA (25 mi) · Latah County (34 mi) · Garfield County, WA (38 mi) · Whitman County, WA (54 mi) · Columbia County, WA (55 mi).