Blair County is a county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 122,822.^[2] Its county seat is Hollidaysburg, and its largest city is Altoona.^[3] The county was created on February 26, 1846, from parts of Huntingdon and Bedford counties. The county is part of the Southwest Pennsylvania region of the state.^{[lower-alpha 1]}

Quick Facts Country, State ...

Blair County
County
Blair County Courthouse in Hollidaysburg
Flag Seal
Location within the U.S. state of Pennsylvania
Pennsylvania's location within the U.S.
Coordinates: 40°28′N 78°21′W
Country	United States
State	Pennsylvania
Founded	February 26, 1846
Seat	Hollidaysburg
Largest city	Altoona
Area
• Total	527 sq mi (1,360 km2)
• Land	526 sq mi (1,360 km2)
• Water	1.3 sq mi (3 km2)  0.2%
Population  (2020)
• Total	122,822
• Density	234/sq mi (90/km2)
Time zone	UTC−5 (Eastern)
• Summer (DST)	UTC−4 (EDT)
Congressional district	13th
Website	www.blairco.org
Pennsylvania Historical Marker
Designated	April 13, 1982[1]

Close

Blair County comprises the Altoona, PA metropolitan statistical area. It is also part of the Altoona-Huntingdon, PA Combined Statistical Area, which includes Blair and Huntingdon counties.^[4]

According to the U.S. Census Bureau, the county has a total area of 527 square miles (1,360 km²), of which 526 square miles (1,360 km²) is land and 1.3 square miles (3.4 km²) (0.2%) is water.^[5]

As of the census^[8] of 2000, there were 127,089 people and 52,159 households within the county. The population density was 246 people per square mile (95 people/km²). There were 55,061 housing units at an average density of 105 units per square mile (41/km²). The racial makeup of the county was 96.18% White, 1.68% Black or African American, 0.11% Native American, 0.56% Asian, 0.02% Pacific Islander, 0.23% from other races, and 1.22% from two or more races. 0.97% of the population were Hispanic or Latino of any race. 40.0% were of German, 12.2% Irish, 10.7% Italian, 9.9% American, and 6.0% English ancestry.

There were 52,159 households, out of which 28.4% had children under the age of 18 living with them, 52.60% were married couples living together, 11.20% had a female householder with no husband present, and 32.30% were non-families. 27.80% of all households were made up of individuals, and 13.30% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.96.

In the county, the population was spread out, with 21.1% under the age of 18, 3.5% from 18 to 19, 5.9% from 20 to 24, 11.1% from 25 to 34, 19.3% from 35 to 49, 21.4% from 50 to 64, and 17.7% who were 65 years of age or older. The median age was 40 years. The population was 48.55% male and 51.45% female.

Blair County has been a Republican Party stronghold since the party was founded. Franklin D. Roosevelt in 1936 and Lyndon B. Johnson in 1964 are the only Democratic presidential candidates to date to win the county, although Theodore Roosevelt won it as the candidate of the Progressive Party in 1912.

There is one Pennsylvania state park in Blair County, Canoe Creek State Park in Frankstown Township.

Under Pennsylvania law, there are four types of incorporated municipalities: cities, boroughs, townships, and, in at most two cases, towns. The following cities, boroughs and townships are located in Blair County:

• National Register of Historic Places listings in Blair County, Pennsylvania