| 1870 |
Founded as Thornhill United F.C. |
| 1905 |
Changed name to Rotherham County |
| 1907 |
Moved to Millmoor |
| 1919/1920 |
Elected to Football League Division Two |
| 1922/1923 |
Relegated to Division Three North |
1925
|
Merged with Rotherham Town
Changed name to Rotherham United
|
| 1946/1947 |
Division Three North runners-up |
| 1947/1948 |
Division Three North runners-up |
| 1948/1949 |
Division Three North runners-up |
1950/1951
|
Division Three North champions
Promoted to Division Two
|
| 1960/1961 |
League Cup runners-up |
| 1967/1968 |
Relegated to Division Three |
| 1972/1973 |
Relegated to Division Four |
| 1974/1975 |
Promoted to Division Three |
| 1976/1977 |
Missed promotion place on goal average |
1980/1981
|
Division Three champions
Promoted to Division Two
|
| 1982/1983 |
Relegated to Division Three |
| 1987/1988 |
Relegated to Division Four after play-offs |
1988/1989
|
Division Four champions
Promoted to Division Three
|
| 1990/1991 |
Relegated to Division Four |
| 1991/1992 |
Division Four runners-up |
| 1992/1993 |
Division Three renamed Division Two |
| 1996/1997 |
Relegated to Division Three |
| 1998/1999 |
Not promoted after play-offs |
1999/2000
|
Division Three runners-up
Promoted to Division Two
|
2000/2001
|
Division Two runners-up
Promoted to Division One
|
| 2004/2005 |
Division One renamed Football League Championship |
| 2004/2005 |
Relegated to League One |
2006/2007
|
Ten points deducted for entering administration
Relegated to League Two
|
2007/2008
|
Ten points deducted for entering administration
Moved to Don Valley Stadium, Sheffield
|
2009/2010
|
Lost in playoff final
|
