| Senate Name | County | Dist.# | Party | Session # | Dates | Notes |
|---|
|
|
| Yardley, Mahlon | 4 | Bucks | Rep | 83 | 1859 |
| Yardley, Mahlon | 4 | Bucks | Rep | 84 | 1860 |
| Yardley, Mahlon | 4 | Bucks | Rep | 85 | 1861 |
| Yatron, Gus | 11 | Berks | Dem | 145-6 | 1961-62 |
| Yatron, Gus | 11 | Berks | Dem | 147-8 | 1963-64 |
| Yatron, Gus | 11 | Berks | Dem | 149-50 | 1965-66 |
| Yatron, Gus | 11 | Berks (Part) | Dem | 151-2 | 1967-68 |
| Yeakle, Willam A. | 6 | Montgomery | Rep | 98 | 1874 |
| Yeakle, Willam A. | 12 | Montgomery | Rep | 99 | 1875 |
| Yeakle, Willam A. | 12 | Montgomery | Rep | 100 | 1876 |
| Yerkes, Harman | 7 | Bucks, Northampton | Dem | 98 | 1874 |
| Yerkes, Harman | 10 | Bucks | Dem | 99 | 1875 |
| Yerkes, Harman | 10 | Bucks | Dem | 100 | 1876 |
| Yerkes, Harman | 10 | Bucks | Dem | 101 | 1877 |
| Yerkes, Harman | 10 | Bucks | Dem | 102 | 1878 |
| Yosko, Joseph J. | 18 | Northampton | Dem | 138 | 1949-50 |
| Yosko, Joseph J. | 18 | Northampton | Dem | 139 | 1951-52 |
| Yosko, Joseph J. | 18 | Northampton | Dem | 140 | 1953-54 |
| Yosko, Joseph J. | 18 | Northampton | Dem | 141 | 1955-56 |
| Yosko, Joseph J. | 18 | Northampton | Dem | 142 | 1957-58 |
| Yutzy, E. D. | 36 | Bedford, Fulton, Somerset | Rep | 99 | 1875 |
| Yutzy, E. D. | 36 | Bedford, Fulton, Somerset | Rep | 100 | 1876 |
| Yutzy, E. D. | 36 | Bedford, Fulton, Somerset | Rep | 101 | 1877 |
| Yutzy, E. D. | 36 | Bedford, Fulton, Somerset | Rep | 102 | 1878 |