133,644 people (2024 Census estimate, +7.1% since 2020)
1,866 square miles of land · 72 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.
35 active community water systems list Bonneville County in the area they serve, reporting 119,098 people served in all (a system that crosses county lines counts its whole population).
| IDAHO FALLS CITY OF groundwater · local government · ID7100039 | 69,450 served |
| FALLS WATER COMPANY INC groundwater · private · ID7100030 | 22,650 served |
| AMMON CITY OF groundwater · local government · ID7100004 | 17,338 served |
| IONA WATER DEPT groundwater · local government · ID7100041 | 2,717 served |
| COMORE LOMA groundwater · private · ID7100020 | 1,626 served |
| UCON CITY OF groundwater · local government · ID7100094 | 1,161 served |
| 3D WATER ASSOCIATION groundwater · private · ID7100201 | 680 served |
| TAYLOR MOUNTAIN WATER AND SEWER DISTRICT groundwater · private · ID7100023 | 600 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 340 people were held in Bonneville County's jail, in Vera's latest figure (2023), or 418 per 100,000 residents ages 15–64. In 2018 it was about 370.
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 Bonneville County. School taxes are usually the largest part of a property tax bill.
Spent $126.8 million — $120.6 million to run schools, about $8,756 per student, plus $1.2 million on buildings and equipment. Money in: $24.9 million local (mostly property tax), $96.1 million state, $21.1 million federal. Long-term debt: $104.5 million.
Spent $111.6 million — $104.1 million to run schools, about $10,159 per student, plus $7.3 million on buildings and equipment. Money in: $18.9 million local (mostly property tax), $73.6 million state, $21.2 million federal. Long-term debt: $6.9 million.
Spent $1.4 million — $1.3 million to run schools, about $19,507 per student, plus $89,000 on buildings and equipment. Money in: $394,000 local (mostly property tax), $949,000 state, $256,000 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 Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Bonneville County about $64.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
213 bridges in Bonneville County: 69 in good condition, 141 fair, and 3 poor (1.4%). “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.
| S 25 E; S HITT RD over SAND CREEK · built 1994 | 27,500 vehicles a day |
| STP7046;LINCOLN RD over IDAHO CANAL · built 1984 | 18,000 vehicles a day |
| N 45TH E over SAND CREEK · built 1957 | 2,100 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $18.2 million of work in Bonneville County in fiscal 2025, about $147 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 Bonneville 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 Bonneville County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Madison County (27 mi) · Teton County (33 mi) · Bingham County (41 mi) · Caribou County (42 mi) · Jefferson County (45 mi) · Fremont County (57 mi).