14,040 people (2024 Census estimate, +15.6% since 2020)
1,269 square miles of land · 11 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.
14 active community water systems list Boundary County in the area they serve, reporting 11,234 people served in all (a system that crosses county lines counts its whole population).
| BONNERS FERRY CITY OF surface water · local government · ID1110003 | 3,367 served |
| THREE MILE WATER DIST groundwater · public/private · ID1110028 | 2,652 served |
| CABINET MOUNTAINS WATER DIST groundwater · public/private · ID1110042 | 2,335 served |
| MOYIE SPRINGS CITY OF groundwater · local government · ID1110021 | 1,123 served |
| BEE LINE WATER ASSN INC surface water · private · ID1110001 | 533 served |
| MISSION CREEK WATER ASSN groundwater · local government · ID1110019 | 263 served |
| PARADISE VALLEY WATER ASSN surface water · private · ID1110023 | 250 served |
| TWENTY MILE CREEK WATER ASSN surface water · private · ID1110030 | 225 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 25 people were held in Boundary County's jail, in Vera's latest figure (2019), or 363 per 100,000 residents ages 15–64. In 2014 it was about 26.
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 Boundary County. School taxes are usually the largest part of a property tax bill.
Spent $18.2 million — $17.9 million to run schools, about $12,419 per student, plus $328,000 on buildings and equipment. Money in: $3.6 million local (mostly property tax), $10.7 million state, $4.6 million federal. Long-term debt: $675,000.
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 Boundary County about $6.8 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.
84 bridges in Boundary County: 26 in good condition, 47 fair, and 11 poor (13.1%). “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.
| S5907;DEEP CRK LP over BNRR;UPRR & DEEP CREEK · built 1936 | 900 vehicles a day |
| STC 5804;WESTSIDE over MYRTLE CREEK · built 1958 | 300 vehicles a day |
| FS ROUTE NO. 2450 over BLUE JOE CREEK · built 1953 | 50 vehicles a day |
| FS ROUTE NO 2546 over BLUE JOE CREEK UPPER · built 1953 | 50 vehicles a day |
| FS ROUTE NO. 2798 over CANUCK CREEK · built 1957 | 50 vehicles a day |
| FS ROUTE NO. 1009 over GRASS CREEK · built 1972 | 50 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $5.4 million of work in Boundary County in fiscal 2025, about $444 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 Boundary 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 Boundary County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Bonner County (31 mi) · Pend Oreille County, WA (36 mi) · Lincoln County, MT (51 mi) · Stevens County, WA (66 mi) · Kootenai County (76 mi) · Spokane County, WA (89 mi).