| 1878 |
Grimsby Town F.C. founded |
| 1892/1893 |
Founder member of Football League Division Two |
| 1899 |
Moved to Blundell Park |
1900/1901
|
Division Two champions
Promoted to Division One
|
| 1902/1903 |
Relegated to Division Two |
1910
|
Failed to be re-elected to Division Two
Joined Midland League
|
| 1911/1912 |
Re-elected to Division Two |
| 1919/1920 |
Relegated to Division Three South |
| 1920/1921 |
Transferred from Division Three South to North |
1925/1926
|
Division Three North champions
Promoted to Division Two
|
1928/1929
|
Division Two runners-up
Promoted to Divison One
|
| 1931/1932 |
Relegated to Division Two |
1933/1934
|
Division Two champions
Promoted to Division One
|
| 1935/1936 |
F.A. Cup semi-finalists |
| 1938/1939 |
F.A. Cup semi-finalists |
| 1947/1948 |
Relegated to Division Three North |
| 1951/1952 |
Division Three North runners-up |
1955/1956
|
Division Three North champions
Promoted to Division Two
|
| 1958/1959 |
Relegated to Division Three |
1961/1962
|
Division Three runners-up
Promoted to Division Two
|
| 1963/1964 |
Relegated to Division Three |
| 1967/1968 |
Relegated to Division Four |
1971/1972
|
Division Four champions
Promoted to Division Three
|
| 1976/1977 |
Relegated to Division Four |
1978/1979
|
Division Four runners-up
Promoted to Division Three
|
1979/1980
|
Division Three champions
Promoted to Division Two
|
| 1986/1987 |
Relegated to Division Three |
| 1987/1988 |
Relegated to Division Four |
1989/1990
|
Division Four runners-up
Promoted to Division Three
|
| 1990/1991 |
Promoted to Division Two |
| 1992/1993 |
Division Two renamed Division One |
| 1996/1997 |
Relegated to Division Two |
| 1997/1998 |
Promoted to Division One after play-offs |
| 2002/2003 |
Relegated to Division Two |
2003/2004
|
Relegated to Division Three
Division Three renamed League Two
|
| 2005/2006 |
Not promoted after play-offs |
| 2007/2008 |
Football League Trophy finalist |
2009/2010
|
Relegated to the Conference
|
