Formed on February 26, 1846 from Bedford and Huntingdon counties. Named for the Hon. John Blair, a prominent citizen who died in 1832. Hollidaysburg, county seat, was incorporated 1836. City of Altoona, founded 1849, became a major railroad center.

Marker is at the intersection of Allegheny Street and Union Street, on the right when traveling west on Allegheny Street.

Courtesy hmdb.org

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