Williamson Cup – Team History
| Year | Champion |
|---|---|
| 2024 | Washington, D.C. |
| 2023 | Rochester |
| 2022 | Washington, D.C. |
| 2021 | Washington, D.C. |
| 2020 | No Contest - COVID-19 |
| 2019 | Western Pennsylvania |
| 2018 | Western Pennsylvania |
| 2017 | Western Pennsylvania |
| 2016 | Ontario |
| 2015 | Metropolitan, New York |
| 2014 | Québec |
| 2013 | Ontario |
| 2012 | Metropolitan, New York |
| 2011 | Metropolitan, New York |
| 2010 | Washington, D.C. |
| 2009 | Rochester |
| 2008 | Ontario |
| 2007 | Washington, D.C. |
| 2006 | Ontario |
| 2005 | Ontario |
| 2004 | Metropolitan, New York |
| 2003 | Pennsylvania |
| 2002 | Delaware |
| 2001 | Michigan |
| 2000 | Philadelphia |
| 1999 | Ontario |
| 1998 | Ontario |
| 1997 | Michigan |
| 1996 | Metropolitan, New York |
| 1995 | Metropolitan, New York |
| 1994 | Detroit |
| 1993 | Philadelphia |
| 1992 | Syracuse |
| 1991 | Philadelphia |
| 1990 | Michigan |
| 1989 | Metropolitan, New York |
| 1988 | Philadelphia |
| 1987 | Philadelphia |
| 1986 | Metropolitan, New York |
| 1985 | Metropolitan, New York |
| 1984 | Philadelphia |
| 1983 | Buffalo |
| 1982 | Massachusetts |
| 1981 | Massachusetts |
| 1980 | Ontario |
| 1979 | Boston |
| 1978 | Rochester |
| 1977 | Ontario |
| 1976 | Buffalo |
| 1975 | Ontario |
| 1974 | Washington, D.C. |
| 1973 | Ontario |
| 1972 | Metropolitan, New York |
| 1971 | Washington, D.C. |
| 1970 | Washington, D.C. |
| 1969 | Philadelphia |
| 1968 | Ontario |
| 1967 | Buffalo |
| 1966 | Buffalo |
| 1965 | Metropolitan, New York |
| 1964 | Washington, D.C. |