The 1990 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The London Tigers defeated the New Britain Red Sox three games to zero to win the Eastern League Championship Series.
| Eastern League | ||||
|---|---|---|---|---|
| Team | Win | Loss | % | GB |
| Albany/Colonie Yankees | 79 | 60 | .568 | – |
| London Tigers | 76 | 63 | .547 | 3.0 |
| Canton–Akron Indians | 76 | 64 | .543 | 3.5 |
| New Britain Red Sox | 72 | 67 | .518 | 7.0 |
| Harrisburg Senators | 69 | 69 | .500 | 9.5 |
| Hagerstown Suns | 67 | 71 | .486 | 11.5 |
| Williamsport Bills | 61 | 79 | .436 | 18.5 |
| Reading Phillies | 55 | 82 | .401 | 23.0 |
Notes:
The 2005 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 2004 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 2003 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 2002 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 2001 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1998 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1996 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1995 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1994 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 2000 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1993 Eastern League baseball season began on approximately April 1 and the regular season ended on approximately September 1.
The 1988 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1987 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1986 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1985 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1984 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1983 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1982 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1981 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.
The 1980 Eastern League season began on approximately April 1 and the regular season ended on approximately September 1.