Yes it does but does not list 1989. Still looking for a site that lists 1989.
National Championships by school (multiple winners only)
School Championships Years
Massillon, OH, Washington 9 1935, 1936, 1939, 1940, 1950, 1952, 1953, 1959, 1961
Concord, CA, De La Salle 7 1994, 1998, 1999, 2000, 2001, 2002, 2003
Valdosta, GA 6 1962, 1969, 1971, 1984, 1986, 1992
Miami, FL 5 1942, 1943, 1960, 1962,1965
Cincinnati, OH, Moeller 5 1976, 1977, 1979, 1980, 1982
Oak Park, IL 5 1910, 1911, 1912, 1913, 1920
Coral Gables, FL 4 1964, 1967, 1968, 1969
Santa Ana, CA, Mater Dei 4 1994, 1996, 2017, 2018
Austin, TX, Reagan 3 1967, 1968, 1970
Berwick, PA 3 1983, 1992, 1995
Cleveland, OH, St. Ignatius 3 1989, 1993, 1995
Southlake, TX, Carroll 3 2004, 2005, 2006
Las Vegas, NV, Bishop Gorman 3 2014, 2015, 2016
Canton, OH, McKinley 2 1934, 1997
Everett, MA 2 1914, 1915
Fort Lauderdale, FL, St. Thomas Aquinas 2 2008, 2010
Lakeland, FL 2 2005, 2006
Little Rock, AR, Central 2 1946, 1957
Odessa, TX, Permian 2 1972, 1989
Pine Bluff, AR 2 1925, 1939
Ramsey, NJ, Don Bosco Prep 2 2009, 2011
San Diego High School, San Diego, CA 2 1916, 1955
Toledo, OH, Scott 2 1922, 1923
Toledo, OH, Waite 2 1924, 1932
Tuscaloosa, AL 2 1926, 1929
Waco, TX, 2 1927, 1948
Warner Robins, GA 2 1976, 1981