| YEAR | EVENT | NAME | COUNTRY | BIKE BRAND |
| 1970 | 250 Trans-AMA | Jeff Smith | England | BSA |
| 1971 | 500 Trans-AMA | Adolf Weil | Germany | Maico |
| 250 Inter-AMA | Vlastimil Valek | Czechoslovakia | CZ | |
| 1972 | 250 Inter-AMA | Arne Lindfors | Sweden | Yam |
| 500 Trans-AMA | Gary Jones | Hacienda Heights, CA | Yam | |
| 1973 | 250 Inter-AMA | Heikki Mikkola | Finland | Husqvarna |
| 500 Trans-AMA | Pierre Karsmakers | Holland | Yam | |
| 1974 | 500 Trans-AMA | Roger DeCoster | Belgium | Suz |
| 1975 | 500 Trans-AMA | Roger DeCoster | Belgium | Suz |
| 1976 | 500 Trans-AMA | Roger DeCoster | Belgium | Suz |
| 500 National | Steve Stackable | Austin, TX | Suz | |
| 1977 | 500 Trans-AMA | Roger DeCoster | Belgium | Suz |
| 500 National | Marty Smith | San Diego, CA | Hon | |
| 1978 | 250 USGP | Marty Tripes | Santee, CA | Hon |
| 500 Trans-AMA | Roger DeCoster | Belgium | Suz | |
| 1979 | 250 USGP | Kent Howerton | San Antonio, TX | Suz |
| 500 Trans-USA | Brad Lackey | Lakewood, CA | Kaw | |
| 1980 | 250 USGP | Kent Howerton | San Antonio, TX | Suz |
| 500 Trans-USA | Kent Howerton | San Antonio, TX | Suz | |
| 1981 | 250 USGP | Neil Hudson | England | Yam |
| 500 Trans-USA | Broc Glover | El Cajon, CA | Yam | |
| 1982 | 250 USGP | Kees van der Ven | Holland | KTM |
| 1983 | 250 USGP | David Bailey | Axton, VA | Hon |
| 1984 | 250 USGP | Ron Lechien | El Cajon, CA | Hon |
| 1985 | 250 USGP | Johnny O’Mara | Simi Valley, CA | Hon |
| 1986 | 250 USGP | Bob Hannah | Whittier, CA | Suz |
| 1987 | MX des Nations | Team USA (Johnson, Hannah and Ward) | Hon, Suz, Kaw | |
| 1988 | 250 USGP | Rick Johnson | El Cajon, CA | Hon |
| 1989 | 250 USGP | Rick Johnson | El Cajon, CA | Hon |
| 500 National | Jean-Michel Bayle | France | Hon | |
| 125 National | Damon Bradshaw | Charlotte, NC | Yam | |
| 1990 | 250 USGP | Jeff Stanton | Sherwood, MI | Hon |
| 500 National | Rick Johnson | El Cajon, CA | Hon | |
| 125 National | Guy Cooper | Stillwater, OK | Suz | |
| 1991 | 250 USGP | Jeff Stanton | Sherwood, MI | Hon |
| 500 National | Jeff Ward | Capistrano, CA | Kaw | |
| 125 National | Guy Cooper | Stillwater, OK | Suz | |
| 1992 | 250 USGP | Jeff Stanton | Sherwood, MI | Hon |
| 1993 | 250 National | Mike Kiedrowski | Canyon Country, CA | Kaw |
| 125 National | James Dobb | England | Kaw | |
| 1994 | 250 National | Mike LaRocco | South Bend, IN | Kaw |
| 125 National | Ryan Hughes | Escondido, CA | Kaw | |
| 1995 | 250 National | Mike LaRocco | South Bend, IN | Kaw |
| 125 National | Ryan Hughes | Escondido, CA | Kaw | |
| 1996 | 250 National | Greg Albertyn | South Africa | Suz |
| 125 National | Steve Lamson | Pollock Pines, CA. | Hon | |
| 1997 | 250 National | Jeff Emig | Riverside, CA | Kaw |
| 125 National | Kevin Windham | Baton Rouge, LA | Yam | |
| 1998 | 250 National | Jeff Emig | Riverside, CA | Kaw |
| 125 National | Ricky Carmichael | Havana, FL | Kaq | |
| 1999 | 250 National | Mike LaRocco | South Bend, IN | Hon |
| 125 National | Ricky Carmichael | Havana, FL | Kaw | |
| 2000 | 250 National | Ricky Carmichael | Havana, FL | Kaw |
| 125 National | Stephane Roncada | France | Yam | |
| 2001 | 250 National | Ricky Carmichael | Havana, FL | Kaw |
| 125 National | Grant Langston | South Africa | KTM | |
| 2002 | 250 National | Ricky Carmichael | Havana, FL | Hon |
| 125 National | James Stewart | Haines City, FL | Kaw | |
| 2003 | 250 National | Kevin Windham | Centreville. MS | Hon |
| 125 National | James Stewart | Haines City, FL | Kaw | |
| 2004 | 250 National | Ricky Carmichael | Havana, FL | Hon |
| 125 National | James Stewart | Haines City, FL | Kaw | |
| 2005 | 250 National | Ricky Carmichael | Havana, FL | Suz |
| 125 Natioal | Broc Hepler | Kittanning, PA | Suz | |
| 2006 | 450 National | Ricky Carmichael | Havana, FL | Suz |
| 250 National | Ryan Villopoto | Poulsbo, WA | Kaw | |
| 2007 | 450 National | Kevin Windham | Centreville, MS | Hon |
| 250 National | Ben Townley | Tallahassee, FL | Kaw | |
| 2008 | 450 National | James Stewart | Haines City, FL | Kaw |
| 250 National | Ryan Villopoto | Poulsbo, WA | Kaw | |
| 2009 | 450 National | Chad Reed | Australia | Suz |
| 250 National | Christophe Pourcel | France | Kaw |