Parish finder for the RomanCatholic Diocese of Altoona-Johnstown can be found at this link: https://www.dioceseaj.org/parish-finder/. According to the Diocese site "all sacramental records are located at the parish at which the sacrament was celebrated. Individuals seeking these records are invite to contact the specific parish".
Many parishes are indexed in the volumes by Albert H. Ledoux: Catholic Vital Records of Central Pennsylvania. [974.8 K2]. Vols. 1-5] Family History Library only has volumes 1,2,4,5. The following counties are included: Bedford, Blair, Cambria, Centre, Clinton, Fulton, Huntingdon.