1,231,814 people (2024 Census estimate, −1.4% since 2020)
730 square miles of land · 1,688 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.
39 active community water systems list Allegheny County in the area they serve, reporting 1,945,351 people served in all (a system that crosses county lines counts its whole population).
| PA AMER WATER CO-PITTSBURGH surface water · private · PA5020039 | 686,000 served |
| PITTSBURGH WATER & SEWER AUTH surface water · local government · PA5020038 | 520,000 served |
| WEST VIEW WATER AUTHORITY surface water · local government · PA5020043 | 200,000 served |
| WILKINSBURG-PENN JT WATER AUTH surface water · local government · PA5020056 | 125,000 served |
| HAMPTON SHALER WATER AUTHORITY buys surface water · local government · PA5020019 | 61,949 served |
| MONROEVILLE MUNICIPAL AUTH buys surface water · local government · PA5020027 | 48,500 served |
| OAKMONT WATER AUTHORITY surface water · local government · PA5020036 | 39,901 served |
| MOON TWP MUNI AUTH surface water · local government · PA5020011 | 38,000 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 1,801 people were held in Allegheny County's jail, in Vera's latest figure (2024), or 230 per 100,000 residents ages 15–64. In 2019 it was about 3,260.
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.
43 school districts have their office in Allegheny County. School taxes are usually the largest part of a property tax bill.
Spent $776.1 million — $629.9 million to run schools, about $31,443 per student, plus $59.3 million on buildings and equipment. Money in: $395 million local (mostly property tax), $326.6 million state, $95.5 million federal. Long-term debt: $311.4 million.
Spent $180.6 million — $167.4 million to run schools, about $19,787 per student, plus $4 million on buildings and equipment. Money in: $155 million local (mostly property tax), $42 million state, $3.3 million federal. Long-term debt: $150.4 million.
Spent $110.2 million — $100.9 million to run schools, about $18,372 per student, plus $1.1 million on buildings and equipment. Money in: $86 million local (mostly property tax), $27.1 million state, $1.4 million federal. Long-term debt: $121.6 million.
Spent $100.7 million — $83.1 million to run schools, about $18,186 per student, plus $13.8 million on buildings and equipment. Money in: $69.9 million local (mostly property tax), $23.5 million state, $2.6 million federal. Long-term debt: $37.4 million.
Spent $103.3 million — $66.6 million to run schools, about $14,673 per student, plus $30.5 million on buildings and equipment. Money in: $53.9 million local (mostly property tax), $29.2 million state, $4.5 million federal. Long-term debt: $88.3 million.
Spent $97.2 million — $82.5 million to run schools, about $18,179 per student, plus $8 million on buildings and equipment. Money in: $83.2 million local (mostly property tax), $20.7 million state, $2.2 million federal. Long-term debt: $111 million.
Spent $107.7 million — $99.3 million to run schools, about $23,875 per student, plus $2.4 million on buildings and equipment. Money in: $88.9 million local (mostly property tax), $23.3 million state, $2.9 million federal. Long-term debt: $65.4 million.
Spent $83.6 million — $74.7 million to run schools, about $18,520 per student, plus $1.6 million on buildings and equipment. Money in: $68.4 million local (mostly property tax), $21.5 million state, $2.6 million federal. Long-term debt: $146.3 million.
And 35 more.
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 High compared with other U.S. counties. FEMA estimates natural hazards cost Allegheny County about $354.2 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.
1,296 bridges in Allegheny County: 388 in good condition, 788 fair, and 120 poor (9.3%). “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.
| PARKWAY EAST over OLD WM PENN HWY LEAK RUN · built 1962 | 52,457 vehicles a day |
| MCKNIGHT RD over BABCOCK BLVD GIRDYS RUN · built 1946 | 50,212 vehicles a day |
| PA TURNPIKE (I-76) over PLUM CREEK · built 1952 | 38,689 vehicles a day |
| PA TPK (I-76) over T-911 · built 1952 | 38,689 vehicles a day |
| KENNYWOOD BLVD over UNION RR THOMPSON RUN · built 1928 | 22,325 vehicles a day |
| BLVD OF THE ALLIES over CSX RR & BIKE TRAIL · built 1938 | 21,211 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $1.3 billion of work in Allegheny County in fiscal 2025, about $1,002 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 Allegheny 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 Allegheny County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Washington County (23 mi) · Beaver County (24 mi) · Westmoreland County (29 mi) · Butler County (31 mi) · Hancock County, WV (31 mi) · Brooke County, WV (34 mi).