County · code 42013
Blair CountyPennsylvania
Blair County is a county in Pennsylvania, established in 1846 with its county seat in Hollidaysburg. Named after John Blair, the county was formed from parts of Bedford and Huntingdon counties.
- Founded1846
- County seatHollidaysburg
- Named forJohn Blair
- Land area525 sq mi + 1.3 sq mi water
- Population122,822 2020 Census
- Parcels mapped66,128 checked 15 October 2026
Where it is
Blair on the map of Pennsylvania
Pennsylvania has 67 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1846 from Bedford County and Huntingdon County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Blair County was created on July 27, 1846, from portions of Bedford County and Huntingdon County.
- 1846Blair County created Blair created from Bedford and Huntingdon. · Pa. Laws 1846, no. 55, secs. 1, 13/pp. 64, 66-67
- 1850Boundary clarified Boundary between Blair and Bedford clarified (no change).with Bedfordno change· Pa. Laws 1850, no. 394, sec. 3/p. 680
Land and parcels
What the maps cover in Blair
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 66,128 parcels from Blair County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 15 October 2026 -
Address points Missing
No public address points layer found for Blair County yet.
-
Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Blair by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Permits
County government
- County government
The official website of Blair County.
See your own lot on these maps
Open Blair County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Blair County
- When was Blair County founded?
- Blair County was founded in 1846, formed from Bedford County and Huntingdon County, and named after John Blair.
- What is the county seat of Blair County?
- The county seat of Blair County is Hollidaysburg.
- Is there an online parcel map for Blair County?
- Yes. Blair County publishes a parcel map of 66,128 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Blair County's boundary or name changed?
- Blair County was created in 1846 from Bedford County and Huntingdon County. Its boundary has been clarified one time since, with no change on the ground.
- Who issues building permits in Blair County?
- The county's page on building permits: Building Permit. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Blair County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby