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| First Basemen Single-Season On-Base Pct Leaderboard | |
| * - Indicates Hall of Fame
+ - indicates hit-less at-bats added to meet 502PA requirement. |
| Rank | Player | On-Base Pct | PA | Year | |
| 1. | Dan Brouthers | .4077 | 650 | 1884 | |
| 2. | Dave Orr | .3867 | 675 | 1884 | |
| 3. | Roger Connor | .3806 | 536 | 1884 | |
| 4. | Fred Mann | .3675 | 567 | 1884 | |
| 5. | Ed Swartwood | .3567 | 642 | 1884 | |
| 6. | Harry Stovey | .3436 | 649 | 1884 | |
| 7. | John Reilly | .3293 | 665 | 1884 | |
| 8. | Martin Powell | .3271 | 650 | 1884 | |
| 9. | Juice Latham | .3116+ | 478 | 1884 | |
| 10. | Charlie Comiskey | .2604 | 553 | 1884 | |
| 11. | John Morrill | .2520 | 653 | 1884 | |
| 12. | Jim Tray | .2500 | 559 | 1884 | |
| 13. | Sid Farrar | .2495 | 559 | 1884 | |
| 14. | Ed Cogswell | .2409+ | 448 | 1884 | |
| 15. | Wally Andrews | .2237 | 608 | 1884 |
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