District 20 was created in 1958 as one of the original 33 California Districts. District 60 was spun off from District 20 in 1971

District 20 Champions:

 

 

2017- La Verne

2016- Glendora National

2015- Glendora American

2014- Glendora National

2013- La Verne

2012- Glendora National

2011- La Verne

2010- San Dimas

2009- La Verne

2008- La Verne American

2007- Claremont

2006- San Dimas
2005- Claremont

2004 - Glendora American
2003 - La Verne National
2002 - Glendora American
2001 - Glendora American
2000 - Pomona American
1999 - Pomona American
1998 - San Dimas
1997 - La Verne National
1996 - Diamond Bar American
1995 - Diamond Bar American
1994 - Ted Green (Pomona)
1993 - Diamond Bar American
1992 - Diamond Bar American
1991 - Diamond Bar American
1990 - La Verne
1989 - Diamond Bar
1988 -
1987 - Pomona American
1986 -
1985 -
1984 - Diamond Bar American
1983 - Glendora National
1982 - Diamond Bar American
1981 - Glendora American
1980 - San Dimas
1979 - Diamond Bar
1978 - Pomona American
1977 - Pomona American
1976 - La Verne
1975 - Diamond Bar
1974 - South Hills (Glendora)
1973 - Diamond Bar
1972 - Glendora American
1971 - Diamond Bar
1970 - La Puente National
1969 - Ted Green (Pomona)
1968 - Sunset (La Puente)
1967 - Claremont National
1966 - Rowland
1965 - La Puente National
1964 - La Puente National (Won Division)
1963 - La Puente National
1962 - La Puente Warriors
1961 - Maverick (Whittier)
1960 - Maverick (Whittier)
1959 - La Puente National
1958 - East Whittier