Blair County
| Blair County, Pennsylvania | |
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Blair County Courthouse, Hollidaysburg
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 Location in the U.S. state of Pennsylvania |
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 Pennsylvania's location in the U.S. |
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| Founded | February 26, 1846 |
| Seat | Hollidaysburg |
| Largest city | Altoona |
| Area | |
| • Total | 527 sq mi (1,365 km2) |
| • Land | 526 sq mi (1,362 km2) |
| • Water | 1.3 sq mi (3 km2), 0.2% |
| Population (est.) | |
| • (2015) | 125,593 |
| • Density | 239/sq mi (92/km²) |
| Congressional district | 9th |
| Time zone | Eastern: UTC-5/-4 |
| Website | www |
| Footnotes: | |
| Designated | April 13, 1982 |
Blair County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 127,089. Its county seat is Hollidaysburg. The county was created on February 26, 1846, from parts of Huntingdon and Bedford Counties.
Blair County comprises the Altoona, PA Metropolitan Statistical Area.
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.
As of the census of 2000, there were 127,089 people and 52,159 households within the county. The population density was 246 people per square mile (95/km²). There were 55,061 housing units at an average density of 105 per square mile (40/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 according to Census 2000.
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