199,341 people (2024 Census estimate, +2.7% since 2020)
789 square miles of land · 252 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.
40 active community water systems list Butler County in the area they serve, reporting 137,569 people served in all (a system that crosses county lines counts its whole population).
| PA AMERICAN WATER CO BUTLER surface water · private · PA5100012 | 43,286 served |
| CRANBERRY TWP WTP buys surface water · local government · PA5100094 | 42,000 served |
| SLIPPERY ROCK MUNI AUTH groundwater · local government · PA5100079 | 15,778 served |
| MUNICIPAL WATER AUTH ADAMS TWP buys surface water · local government · PA5100141 | 8,700 served |
| HARMONY BORO WATER AUTH surface water · local government · PA5100042 | 6,669 served |
| ZELIENOPLE BORO buys surface water · local government · PA5100093 | 4,123 served |
| PETROLEUM VALLEY RWA buys groundwater · local government · PA5100147 | 3,800 served |
| SEVEN FIELDS BORO WATER DEPT buys surface water · local government · PA5100135 | 3,100 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 439 people were held in Butler County's jail, in Vera's latest figure (2023), or 350 per 100,000 residents ages 15–64. In 2018 it was about 296.
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.
8 school districts have their office in Butler County. School taxes are usually the largest part of a property tax bill.
Spent $160.8 million — $139.3 million to run schools, about $18,802 per student, plus $12.7 million on buildings and equipment. Money in: $118.3 million local (mostly property tax), $40.8 million state, $3 million federal. Long-term debt: $111.8 million.
Spent $115.3 million — $99.7 million to run schools, about $16,450 per student, plus $9.5 million on buildings and equipment. Money in: $56.1 million local (mostly property tax), $51.1 million state, $13.7 million federal. Long-term debt: $73.6 million.
Spent $54.8 million — $47.4 million to run schools, about $13,412 per student, plus $1.9 million on buildings and equipment. Money in: $43 million local (mostly property tax), $15.5 million state, $555,000 federal. Long-term debt: $83.6 million.
Spent $41.8 million — $35 million to run schools, about $17,244 per student, plus $4.5 million on buildings and equipment. Money in: $22.3 million local (mostly property tax), $15.8 million state, $990,000 federal. Long-term debt: $33.5 million.
Spent $38.2 million — $33.1 million to run schools, about $17,440 per student, plus $4.1 million on buildings and equipment. Money in: $18.9 million local (mostly property tax), $16.5 million state, $1.1 million federal. Long-term debt: $73,000.
Spent $35.5 million — $31.9 million to run schools, about $17,628 per student, plus $464,000 on buildings and equipment. Money in: $21.6 million local (mostly property tax), $14.9 million state, $1.9 million federal. Long-term debt: $31.2 million.
Spent $29.8 million — $24.3 million to run schools, about $18,503 per student, plus $4.1 million on buildings and equipment. Money in: $9.9 million local (mostly property tax), $17.2 million state, $1.6 million federal. Long-term debt: $20.3 million.
Spent $23.8 million — $22.2 million to run schools, about $19,330 per student, plus $435,000 on buildings and equipment. Money in: $8.5 million local (mostly property tax), $14.5 million state, $1.9 million federal. Long-term debt: $17.6 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 Butler County about $47.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
374 bridges in Butler County: 111 in good condition, 212 fair, and 51 poor (13.6%). “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.
| SR3022 over BRUSH CREEK · built 1965 | 16,565 vehicles a day |
| SR 0422 EB&WB over TRIB TO MUDDY CREEK · built 1949 | 13,364 vehicles a day |
| SR0008 over MUDDY CREEK · built 1942 | 10,376 vehicles a day |
| SR3018 over I-79 NB/SB & TR BRUSH CR · built 1970 | 10,286 vehicles a day |
| SR0068 over B&LE B&P RRS;CONNOQUE CR · built 1937 | 9,259 vehicles a day |
| SOUTH MONROE ST. over CONNOQUENESSING CR · built 1970 | 6,900 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $114.2 million of work in Butler County in fiscal 2025, about $589 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 Butler 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 Butler County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Lawrence County (22 mi) · Armstrong County (25 mi) · Beaver County (28 mi) · Allegheny County (31 mi) · Mercer County (32 mi) · Clarion County (33 mi).