For unknown reasons, it appears that the Athletic of Philadelphia, clearly the strongest team in the NA, never played a series for the championship.
By 1868, the association had several hundred teams. Most subpar and short-lived teams are omitted here. Standings were determined by number of total wins, rather than winning percentage. Historical records of game results and player statistics may be missing or incomplete.
| TEAM | W | L | Pct | GB | ||
 | Athletic | 47 | 3 | .940 | - | |
 | Atlantic | 47 | 7 | .870 | 2.0 | |
 | Union | 37 | 6 | .860 | 6.5 | |
 | Cincinnati | 36 | 7 | .837 | 7.5 | |
 | Mutual | 31 | 10 | .756 | 11.5 | |
 | Eckford | 23 | 12 | .657 | 16.5 | |
 | Cincinnati | 21 | 5 | .808 | 14.0 | |
 | Lansingburgh | 15 | 5 | .750 | 17.0 | |
 | New Jersey | 14 | 7 | .667 | 18.5 | |
 | Albany | 13 | 8 | .619 | 19.5 | |
 | Baltimore | 12 | 6 | .667 | 19.0 | |
 | Boston | 12 | 9 | .571 | 20.5 | |
 | Olympic | 12 | 11 | .521 | 21.5 | |
 | Rockford | 11 | 4 | .733 | 18.5 | |
 | Lowell | 11 | 9 | .550 | 21.0 | |
 | Cleveland | 11 | 11 | .500 | 22.0 | |
 | Eagle | 10 | 1 | .909 | 17.5 | |
 | Bkn. Star | 9 | 10 | .474 | 22.5 | |
 | Washington | 7 | 3 | .700 | 20.0 | |
| | Excelsior | 7 | 8 | .469 | 22.5 | |
| | Milwaukee | 2 | 3 | .400 | 22.5 | |
| | Irvington | 2 | 6 | .250 | 24.0 |