37,373 people (2024 Census estimate, −3.0% since 2020)
884 square miles of land · 42 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 Warren County in the area they serve, reporting 23,697 people served in all (a system that crosses county lines counts its whole population).
| PA AMERICAN WATER CO WARREN groundwater · private · PA6620020 | 14,650 served |
| YOUNGSVILLE MUN WATERWORKS groundwater · local government · PA6620039 | 1,957 served |
| NORTH WARREN MUNI AUTHORITY groundwater · local government · PA6620028 | 1,749 served |
| SHEFFIELD TWP MUNICIPAL AUTH groundwater · local government · PA6620031 | 1,075 served |
| SOUTHWEST WARREN CO MUN AUTH surface water · local government · PA6620032 | 1,040 served |
| AQUA PA CLARENDON groundwater · private · PA6620021 | 840 served |
| WARREN STATE HOSPITAL groundwater · state · PA6620034 | 721 served |
| PINE GROVE TWP WATER SYSTEM groundwater · local government · PA6620029 | 640 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 76 people were held in Warren County's jail, in Vera's latest figure (2023), or 346 per 100,000 residents ages 15–64. In 2018 it was about 90.
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 Warren County. School taxes are usually the largest part of a property tax bill.
Spent $92.4 million — $86.4 million to run schools, about $22,087 per student, plus $2.1 million on buildings and equipment. Money in: $29.3 million local (mostly property tax), $51.8 million state, $14.7 million federal. Long-term debt: $94.8 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 Warren County about $23.1 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
218 bridges in Warren County: 77 in good condition, 103 fair, and 38 poor (17.4%). “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.
| SR 6 GRAND ARMY HY over OVER DUTCHMANS RUN · built 1948 | 6,433 vehicles a day |
| SR 62 MARKET ST. over OVER WILTSIE RUN · built 1960 | 4,727 vehicles a day |
| SR 1011 CONEWANGO over OVER HATCH RUN · built 1953 | 4,181 vehicles a day |
| SR 69 JCKSN.RUN RD over OVER JACKSON RUN · built 1922 | 2,727 vehicles a day |
| SR 69 JCKSN.RUN RD over JACKSON RUN · built 1952 | 2,727 vehicles a day |
| SR 957 E.MAIN ST. over OVER BROKENSTRAW CREEK · built 1955 | 1,800 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $9.5 million of work in Warren County in fiscal 2025, about $245 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 Warren 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 Warren County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Forest County (22 mi) · Chautauqua County, NY (33 mi) · McKean County (37 mi) · Venango County (38 mi) · Crawford County (43 mi) · Cattaraugus County, NY (43 mi).