Altoona is a city in Blair County, Pennsylvania, United States. The population was 43,963 at the time of the 2020 census. It is the principal city of the Altoona metropolitan area, which includes all of Blair County and was recorded as having a population of 122,823. Altoona was established in 1849 by the Pennsylvania Railroad. Having grown around the railroad industry, the city has worked to recover from industrial decline and urban decentralization experienced in recent decades. The city is home to the Altoona Curve baseball team of the Eastern League, which is the AA affiliate of the Pittsburgh Pirates Major League Baseball team. They play at Peoples Natural Gas Field in Altoona. The Altoona Symphony Orchestra has called Altoona home since 1928. Prominent landmarks include the Horseshoe Curve, the Railroaders Memorial Museum, the Juniata Shops of the Altoona Works, the Mishler Theatre, the Cathedral of the Blessed Sacrament, and the Jaffa Shrine Center.