120,269 people (2024 Census estimate, −2.0% since 2020)
525 square miles of land · 229 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.
25 active community water systems list Blair County in the area they serve, reporting 99,620 people served in all (a system that crosses county lines counts its whole population).
| ALTOONA WATER AUTHORITY surface water · local government · PA4070023 | 62,500 served |
| HOLLIDAYSBURG MUNI AUTH buys surface water · local government · PA4070017 | 8,523 served |
| TYRONE BORO WATER AUTH surface water · local government · PA4070021 | 6,500 served |
| ROARING SPRING MUNI WATER AUTH groundwater · local government · PA4070019 | 3,182 served |
| BELLWOOD BORO AUTH buys surface water · local government · PA4070009 | 3,162 served |
| MARTINSBURG MUNI AUTH groundwater · local government · PA4070030 | 3,160 served |
| BLAIR TWP WATER & SEWER AUTH buys surface water · local government · PA4070011 | 2,550 served |
| GREENFIELD TWP MUNI AUTH groundwater · local government · PA4070058 | 2,500 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 336 people were held in Blair County's jail, in Vera's latest figure (2023), or 453 per 100,000 residents ages 15–64. In 2018 it was about 299.
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.
7 school districts have their office in Blair County. School taxes are usually the largest part of a property tax bill.
Spent $127.1 million — $112.9 million to run schools, about $15,625 per student, plus $6 million on buildings and equipment. Money in: $33.8 million local (mostly property tax), $77.7 million state, $23.3 million federal. Long-term debt: $123.6 million.
Spent $52.4 million — $48.9 million to run schools, about $15,596 per student, plus $743,000 on buildings and equipment. Money in: $30.7 million local (mostly property tax), $23 million state, $3.5 million federal. Long-term debt: $25 million.
Spent $34.6 million — $27.3 million to run schools, about $15,546 per student, plus $5.8 million on buildings and equipment. Money in: $10.1 million local (mostly property tax), $17.8 million state, $4.4 million federal. Long-term debt: $5.1 million.
Spent $28.5 million — $26.6 million to run schools, about $16,043 per student, plus $298,000 on buildings and equipment. Money in: $14.2 million local (mostly property tax), $14.7 million state, $3.1 million federal. Long-term debt: $9.7 million.
Spent $21.8 million — $19.4 million to run schools, about $16,655 per student, plus $1.3 million on buildings and equipment. Money in: $7.9 million local (mostly property tax), $12.1 million state, $1.6 million federal. Long-term debt: $11.9 million.
Spent $19 million — $13.8 million to run schools, about $18,157 per student, plus $4.1 million on buildings and equipment. Money in: $4.6 million local (mostly property tax), $10 million state, $2.4 million federal. Long-term debt: $11.1 million.
Spent $8.9 million — $7.9 million to run schools, about $17,093 per student, plus $164,000 on buildings and equipment. Money in: $2.5 million local (mostly property tax), $6 million state, $781,000 federal. Long-term debt: $5.5 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 Blair County about $33.9 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.
338 bridges in Blair County: 123 in good condition, 176 fair, and 39 poor (11.5%). “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.
| T473 N. Eighth St over NORFOLK SOUTHERN RR · built 1979 | 10,200 vehicles a day |
| T473 N. Eighth St over NORFOLK SOUTHERN RR · built 1979 | 10,200 vehicles a day |
| 25TH AVENUE over SPRING RUN · built 1961 | 5,701 vehicles a day |
| SR 1012 over BALD EAGLE CREEK · built 1933 | 2,544 vehicles a day |
| WEST CHESTNUT AVE. over MILL RUN · built 1930 | 1,848 vehicles a day |
| CO RD 101 Bedfrd S over SOUTH DRY RUN · built 1913 | 1,634 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $54.1 million of work in Blair County in fiscal 2025, about $440 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 Blair 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 Blair County built: brayden.ozark@gmail.com.
More of Pennsylvania: the state government and every county in Pennsylvania.
Nearby counties: Huntingdon County (19 mi) · Cambria County (21 mi) · Mifflin County (35 mi) · Bedford County (36 mi) · Clearfield County (36 mi) · Centre County (37 mi).