| Irvin | S | Young Twp |
| Irwin | Benjamin | Blacklick Twp |
| Irwin | J | Montgomery Twp |
| Irwin | J | West Mahoning Twp |
| Irwin | J | West Mahoning Twp |
| Irwin | S | Montgomery Twp |
| Irwin | W | Montgomery Twp |
| Irwin | Wm | Blacklick Twp |
| Iseman? | P | Young Twp |
| Isenberg | W | White Twp |
Indiana County, PA