15,638 people (2024 Census estimate, +9.5% since 2020)
663 square miles of land · 24 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.
15 active community water systems list Franklin County in the area they serve, reporting 10,527 people served in all (a system that crosses county lines counts its whole population).
| PRESTON CITY OF groundwater · local government · ID6210014 | 5,591 served |
| FAIRVIEW WATER DIST groundwater · private · ID6210006 | 1,300 served |
| FRANKLIN CITY OF groundwater (surface-influenced) · local government · ID6210007 | 1,000 served |
| DAYTON CITY OF groundwater · local government · ID6210004 | 510 served |
| WESTON CITY OF groundwater · local government · ID6210019 | 490 served |
| CLIFTON CITY OF groundwater · local government · ID6210002 | 413 served |
| WHITNEY NASHVILLE WATER WORKS groundwater · private · ID6210020 | 403 served |
| BANIDA WATER AND SEWER DIST groundwater · private · ID6210001 | 180 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 14 people were held in Franklin County's jail, in Vera's latest figure (2008), or 194 per 100,000 residents ages 15–64. In 2003 it was about 14.
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.
2 school districts have their office in Franklin County. School taxes are usually the largest part of a property tax bill.
Spent $21.9 million — $20.6 million to run schools, about $8,327 per student, plus $436,000 on buildings and equipment. Money in: $3 million local (mostly property tax), $16.9 million state, $4.2 million federal.
Spent $8.4 million — $7.5 million to run schools, about $8,801 per student, plus $325,000 on buildings and equipment. Money in: $2.1 million local (mostly property tax), $6.9 million state, $1.6 million 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 Franklin County about $5.4 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Low; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
23 bridges in Franklin County: 3 in good condition, 18 fair, and 2 poor (8.7%). “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.
| WESTON-FAIRVIEW RD over BEAR RIVER;E.WESTON BR. · built 1956 | 1,000 vehicles a day |
| PARKINSON ROAD over CUB RIVER · built 1926 | 310 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $377,137 of work in Franklin County in fiscal 2025, about $27 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 Franklin 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 Franklin County built: brayden.ozark@gmail.com.
More of Idaho: the state government and every county in Idaho.
Nearby counties: Bear Lake County (26 mi) · Cache County, UT (31 mi) · Oneida County (36 mi) · Bannock County (41 mi) · Caribou County (45 mi) · Rich County, UT (48 mi).