| Year | Champions | Runners up | 3rd |
|---|---|---|---|
| 1936 | Great Flinders | Port Lincoln | Eastern Eyre |
| 1939 | Eastern Eyre | Great Flinders | Port Lincoln 2 |
| 1947 | Port Lincoln 1 | Port Lincoln 2 | Upper Eyre |
| 1949 | Le Hunte | Eastern Eyre | Port Lincoln 1 |
| 1951 | Great Flinders | Cleve | Le Hunte |
| 1953 | Port Lincoln | Le Hunte | Great Flinders |
| 1955 | Great Flinders | Central Eyre | Eastern Eyre |
| 1956 | Great Flinders | Port Lincoln | Eastern Eyre |
| 1957 | Great Flinders | Kimba | Eastern Eyre |
| 1958 | Eastern Eyre | Port Lincoln | Great Flinders |
| 1959 | Great Flinders | Port Lincoln | Kimba |
| 1960 | Far West | Great Flinders | Kimba |
| 1961 | Port Lincoln | Le Hunte | Great Flinders |
| 1962 | Port Lincoln | Kimba | Great Flinders |
| 1963 | County Jervois | Great Flinders | Port Lincoln |
| 1964 | Lincoln City | Lincoln Districts | Great Flinders |
| 1965 | Lincoln City | Great Flinders | County Jervois |
| 1966 | County Jervois | Lincoln City | Great Flinders |
| 1967 | Lincoln City | Great Flinders | Kimba |
| 1968 | Lincoln Districts | Lincoln City | Great Flinders |
| 1969 | Far West | County Jervois | Le Hunte |
| 1970 | Lincoln Districts | Great Flinders | Lincoln City |
| 1971 | Lincoln City | Lincoln Districts | Le Hunte |
| 1972 | Great Flinders | County Jervois | Lincoln Districts |
| 1973 | Le Hunte | Great Flinders | Streaky Bay |
| 1974 | Great Flinders | Lincoln Districts | Lincoln City |
| 1975 | Le Hunte | Great Flinders | Lincoln Districts |
| 1976 | Great Flinders | Le Hunte | Lincoln Districts |
| 1977 | Great Flinders | County Jervois | Lincoln City |
| 1978 | Great Flinders | Lincoln City | Le Hunte |
| 1979 | Lincoln Districts | Lincoln City | Great Flinders |
| 1980 | Great Flinders | Le Hunte | Lincoln Districts |
| 1981 | Lincoln Districts | Le Hunte | Lincoln City |
| 1982 | Great Flinders | Lincoln Districts | Le Hunte |
| 1983 | Far West | Great Flinders | Kimba |
| 1984 | Far West | Lincoln City | Le Hunte |
| 1985 | Lincoln Districts | Great Flinders | County Jervois |
| 1986 | Far West | Lincoln City | Great Flinders |
| 1987 | Lincoln Districts | Great Flinders | Kimba |
| 1988 | Far West | Lincoln City | Great Flinders |
| Year | Champions | Runners up | 3rd |
|---|---|---|---|
| 1989 | Eastern Eyre | Far West | Great Flinders |
| 1990 | Far West | Lincoln Districts | Great Flinders |
| 1991 | Eastern Eyre | Far West | Great Flinders |
| 1992 | Great Flinders | Kangaroo Island | Woomera & Districts |
| 1993 | Great Flinders | Lincoln Districts | Mid West |
| 1994 | Lincoln Districts | Far West | Lincoln City |
| 1995 | Eastern Eyre | Lincoln City | Great Flinders |
| 1996 | Great Flinders | Eastern Eyre | Mid West |
| 1997 | Mid West | Lincoln Districts | Great Flinders |
| 1998 | Great Flinders | Far West | Eastern Eyre |
| 1999 | Lincoln Districts | Mid West | Great Flinders |
| 2000 | Mid West | Far West | Lincoln Districts |
| 2001 | Great Flinders | Lincoln Districts | Mid West |
| 2002 | Great Flinders | Mid West | Lincoln City |
| 2003 | Mid West | Lincoln Districts | Eastern Eyre |
| 2004 | Lincoln City | Lincoln Districts | Great Flinders |
| 2005 | Mid West | Great Flinders | Eastern Eyre |
| 2006 | Great Flinders | Lincoln City | Mid West |
| 2007 | Great Flinders | Eastern Eyre | Mid West |
| 2008 | Great Flinders | Eastern Eyre | Mid West |
| 2009 | Port Lincoln | Mid West | Great Flinders |
| 2010 | Port Lincoln | Eastern Eyre | Mid West |
| 2011 | Port Lincoln | Eastern Eyre | Great Flinders |
| 2012 | Lincoln City | Great Flinders | Lincoln Districts |
| 2013 | Great Flinders | Eastern Eyre | Lincoln City |
| 2014 | Great Flinders | Eastern Eyre | Lincoln City |
| 2015 | E.P. Sharks | Great Flinders | Lincoln City |
| 2016 | Eastern Eyre | Lincoln Districts | E.P. Sharks |
| 2017 | Lincoln City | Great Flinders | E.P. Sharks |
| 2018 | E.P. Sharks | Great Flinders | Mid West |
| 2019 | Great Flinders | Lincoln Districts | Lincoln City |
| 2020 | NO MORTLOCK SHIELD CARNIVAL DUE TO COVID-19 | ||
| 2021 | Great Flinders | Lincoln City | Eastern Eyre |
| 2022 | Great Flinders | Eastern Eyre | Lincoln Districts |
| 2023 | Western Eyre | Lincoln Districts | Great Flinders |
| 2024 | Lincoln City | Western Eyre | Great Flinders |