Hollidaysburg is a borough located in the Commonwealth of Pennsylvania in the United States. It serves as the county seat of Blair County and is situated along the Juniata River. The borough is positioned approximately 5 miles south of Altoona and is included within the Altoona, Pennsylvania, metropolitan statistical area.
Historically, the local economy was supported by various industries, including foundries, machine shops, a silk mill, car works, and classification yards. The surrounding vicinity contains natural resources such as coal, iron ore, ganister, and limestone. According to census data, the population of the borough was 5,641 in 2020.