43,367 people (2024 Census estimate, −2.5% since 2020)
652 square miles of land · 66 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.
11 active community water systems list Jefferson County in the area they serve, reporting 27,175 people served in all (a system that crosses county lines counts its whole population).
| PA AMERICAN WATER PUNXSY surface water · private · PA6330010 | 8,419 served |
| BROOKVILLE MUNICIPAL AUTH surface water · local government · PA6330004 | 6,220 served |
| BROCKWAY BORO MUNICIPAL AUTH surface water · local government · PA6330002 | 4,384 served |
| REYNOLDSVILLE WATER AUTH surface water · local government · PA6330011 | 2,908 served |
| SYKESVILLE BOROUGH buys surface water · local government · PA6330013 | 1,500 served |
| FALLS CREEK BORO MUN AUTH buys surface water · local government · PA6330007 | 1,440 served |
| SUMMERVILLE BORO MUN AUTH groundwater · local government · PA6330012 | 700 served |
| ELDRED TWP MUNIC AUTH groundwater · local government · PA6330840 | 700 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 98 people were held in Jefferson County's jail, in Vera's latest figure (2023), or 375 per 100,000 residents ages 15–64. In 2018 it was about 144.
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 Jefferson County. School taxes are usually the largest part of a property tax bill.
Spent $45.8 million — $36.2 million to run schools, about $18,821 per student, plus $4.4 million on buildings and equipment. Money in: $12.9 million local (mostly property tax), $28.9 million state, $6.7 million federal. Long-term debt: $32.7 million.
Spent $29 million — $23.9 million to run schools, about $17,549 per student, plus $3 million on buildings and equipment. Money in: $10.6 million local (mostly property tax), $16.9 million state, $3.7 million federal. Long-term debt: $12.1 million.
Spent $20.3 million — $16.8 million to run schools, about $18,872 per student, plus $2.2 million on buildings and equipment. Money in: $4.9 million local (mostly property tax), $12 million state, $1.9 million federal. Long-term debt: $1.4 million.
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 Jefferson County about $14 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
201 bridges in Jefferson County: 59 in good condition, 128 fair, and 14 poor (7.0%). “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.
| SR0080 EB over NORTH FORK & WAT PLNT RD · built 1962 | 12,277 vehicles a day |
| SR3031 over LICK RUN · built 1954 | 279 vehicles a day |
| SR3003 over CHERRY RUN · built 1982 | 254 vehicles a day |
| SR3003 over REDBANK CREEK · built 1938 | 244 vehicles a day |
| SR4006 over NORTH FORK CREEK · built 1961 | 197 vehicles a day |
| T-346 CATHERS RUN over CATHERS RUN · built 1936 | 50 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $28.1 million of work in Jefferson County in fiscal 2025, about $633 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 Pennsylvania 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 Jefferson 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 Jefferson County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Clarion County (22 mi) · Elk County (27 mi) · Forest County (29 mi) · Clearfield County (29 mi) · Armstrong County (32 mi) · Indiana County (34 mi).