| Year | Champion |
| 1996 | DC United |
| 1997 | DC United |
| 1998 | Chicago Fire |
| 1999 | DC United |
| 2000 | Kansas City Wizards |
| 2001 | San Jose Earthquakes |
| 2002 | Los Angeles Galaxy |
| 2003 | San Jose Earthquakes |
| 2004 | DC United |
| 2005 | Los Angeles Galaxy |
| 2006 | Houston Dynamo |
| 2007 | Houston Dynamo |
| 2008 | Columbus Crew |
| 2009 | Real Salt Lake |
| 2010 | Colorado Rapids |
| 2011 | Los Angeles Galaxy |
| 2012 | Los Angeles Galaxy |
| 2013 | Sporting Kansas City |
| 2014 | Los Angeles Galaxy |
| 2015 | Portland Timbers |
| 2016 | Seattle Sounders FC |
| 2017 | Toronto FC |
| 2018 | Atlanta United FC |
| 2019 | Seattle Sounders FC |
| 2020 | Columbus Crew |