63,679 people (2024 Census estimate, −2.7% since 2020)
653 square miles of land · 97 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.
22 active community water systems list Armstrong County in the area they serve, reporting 45,246 people served in all (a system that crosses county lines counts its whole population).
| KITTANNING SUBURB JT WATER AUT surface water · local government · PA5030043 | 8,000 served |
| MANOR TWP JT MUNI AUTH groundwater · local government · PA5030006 | 6,744 served |
| BUFFALO TWP MUN AUTH FREEPORT surface water · local government · PA5030019 | 5,849 served |
| PA AMERICAN WATER KITTANNING surface water · private · PA5030008 | 4,499 served |
| FORD CITY MUNI WATER WORKS groundwater · local government · PA5030005 | 2,991 served |
| PARKS TWP MUNI AUTH buys surface water · local government · PA5030025 | 2,049 served |
| WEST KITTANNING MUNI AUTH buys surface water · local government · PA5030045 | 2,000 served |
| E ARMSTRONG CNTY MUNI AUTH groundwater · local government · PA5030004 | 1,875 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 143 people were held in Armstrong County's jail, in Vera's latest figure (2023), or 371 per 100,000 residents ages 15–64. In 2018 it was about 156.
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 Armstrong County. School taxes are usually the largest part of a property tax bill.
Spent $111.8 million — $88.7 million to run schools, about $19,487 per student, plus $6.9 million on buildings and equipment. Money in: $40.6 million local (mostly property tax), $62.5 million state, $10.7 million federal. Long-term debt: $119.8 million.
Spent $26.5 million — $23.8 million to run schools, about $21,726 per student, plus $929,000 on buildings and equipment. Money in: $9.2 million local (mostly property tax), $16.4 million state, $2.8 million federal. Long-term debt: $9.8 million.
Spent $17.6 million — $14.6 million to run schools, about $22,528 per student, plus $2.2 million on buildings and equipment. Money in: $6.9 million local (mostly property tax), $8.3 million state, $955,000 federal. Long-term debt: $7.7 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 Armstrong County about $27.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
259 bridges in Armstrong County: 91 in good condition, 150 fair, and 18 poor (6.9%). “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.
| SR0128 over TRIB TO PINE RUN · built 1921 | 1,103 vehicles a day |
| SR1036 over COWANSHANNOCK CREEK · built 1962 | 1,065 vehicles a day |
| SR4009 over HART RUN · built 1953 | 956 vehicles a day |
| SR4010 over TRIB TO BUFFALO CREEK · built 1925 | 785 vehicles a day |
| SR0156 over NORFOLK SOUTHERN RR · built 1949 | 643 vehicles a day |
| SR0156 over LONG RUN · built 1957 | 643 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $44 million of work in Armstrong County in fiscal 2025, about $672 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 Armstrong 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 Armstrong County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Indiana County (23 mi) · Butler County (25 mi) · Clarion County (27 mi) · Jefferson County (33 mi) · Westmoreland County (35 mi) · Allegheny County (36 mi).