BUTLER COUNTY
| ORIGIN DATE | PARISH NAME | LOCATION |
| 1821 | St. Peter | Butler |
| 1841 | St. Alphonsus | Murrinsville |
| 1842 | St. Mary Assumption | Herman |
| 1845 | St. Wendelin | Carbon Center |
| 1847 | St. Joseph | North Oakland |
| 1853 | St. John | Coylesville |
| 1867 | St. Paul | Butler |
| 1874 | St. James | Petrolia |
| 1875 | Mater Dolorosa | Chicora |
| 1877 | St. Joseph (German) | North Oakland |
| 1902 | St. Mary | West Winfield |
| 1904 | St. John | Lyndora |
| 1904 | St. Joseph | Cabot |
| 1906 | St. Gregory | Zelienople |
| 1908 | St. Anthony | Forestville |
| 1909 | St. Michael Archangel | Butler |
| 1912 | St. Paschal | Argentine |
| 1918 | St. Stanislaus Kostka | Lyndora |
| 1920 | St. Kilian | Mars |
| 1923 | St. Louis | West Sunbury |
| 1924 | Epiphany | Boyers |
| 1934 | St. Conrad | Meridian |
| 1938 | St. Peter | Slippery Rock |
| 1939 | St. Mathias | Evans City |
| 1955 | Holy Sepulcher | Glade Mills |
| 1961 | St. Ferdinand | Cranberry Twp |
| 1964 | St. Andrew | Center Twp |
| 1974 | St. Christopher | Prospect |
| 1993 | St. Alphonsus | Boyers |
| 1995 | St. Fidelis of Sigmaringen | Lyndora/Meridian |