29,729 people (2024 Census estimate, +3.7% since 2020)
3,075 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.
24 active community water systems list Elmore County in the area they serve, reporting 25,884 people served in all (a system that crosses county lines counts its whole population).
| MOUNTAIN HOME, CITY OF groundwater · local government · ID4200032 | 14,651 served |
| MOUNTAIN HOME AIR FORCE BASE groundwater · federal · ID4200054 | 7,500 served |
| GLENNS FERRY CITY OF surface water · local government · ID4200022 | 1,282 served |
| TRINITY ESTATES WATER USERS ASSN groundwater · private · ID4200053 | 250 served |
| MELLEN SUBD WATER DIST buys groundwater · private · ID4200089 | 250 served |
| CANYON CREEK MOBILE HOME PARK groundwater · private · ID4200010 | 243 served |
| SUMMERWIND WATER USERS groundwater · private · ID4200049 | 192 served |
| MEADOWS MOBILE PARK groundwater · private · ID4200031 | 175 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 51 people were held in Elmore County's jail, in Vera's latest figure (2021), or 271 per 100,000 residents ages 15–64. In 2016 it was about 93.
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 Elmore County. School taxes are usually the largest part of a property tax bill.
Spent $39.3 million — $35.3 million to run schools, about $9,390 per student, plus $4 million on buildings and equipment. Money in: $4.8 million local (mostly property tax), $26.6 million state, $10.5 million federal.
Spent $6.1 million — $5.3 million to run schools, about $13,855 per student, plus $688,000 on buildings and equipment. Money in: $1.1 million local (mostly property tax), $3.7 million state, $1.4 million federal.
Spent $250,000 — $250,000 to run schools, about $50,000 per student. Money in: $15,000 local (mostly property tax), $178,000 state, $21,000 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 Elmore County about $21.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very Low; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
98 bridges in Elmore County: 25 in good condition, 65 fair, and 8 poor (8.2%). “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.
| MORROW RESERVIOR R over LITTLE CANYON CREEK · built 1995 | 170 vehicles a day |
| MORROW RESERVOIR R over LITTLE CANYON CREEK · built 1970 | 170 vehicles a day |
| FALL CK.-ROCKY BAR over EAST FORK FALL CREEK · built 2013 | 50 vehicles a day |
| FALL CREEK RD over FALL CREEK · built 1987 | 30 vehicles a day |
| STC 3809;MIDDLE FK over BLACK WARRIOR CREEK · built 1975 | 30 vehicles a day |
| STC 3809;MIDDLE FK over QUEENS RIVER NO. 2 · built 1962 | 30 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $7.5 million of work in Elmore County in fiscal 2025, about $261 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 Elmore 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 Elmore County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Camas County (36 mi) · Ada County (39 mi) · Boise County (43 mi) · Gooding County (44 mi) · Canyon County (64 mi) · Gem County (65 mi).