1946 Iowa City
1950 Iowa City
1951 Burlington
1952 Newton
1953 Iowa City
1954 Des Moines Roosevelt
1955 Davenport Central
1956 Ames
1957 Davenport Central
1958 Des Moines Roosevelt
1959 Burlington
1960 Iowa City
1961 Sioux City Heelan
1962 Davenport Central
1963 Ottumwa
1964 Cedar Rapids Jefferson
1965 Cedar Rapids Jefferson
1966 Waterloo East
1967 Waterloo East
1968 Waterloo East
1969 Waterloo East
1970 Waterloo East
1971 Waterloo East
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1972 West Des Moines Dowling
1973 Waterloo East
1974 Davenport West
1975 West Des Moines Dowling
1976 Sioux City Heelan
1977 West Des Moines Dowling
1978 Davenport Central
| Year | 4A | 3A-2A-1A |
| 1979 | Sioux City East | Emmetsburg |
| 1980 | Bettendorf | Emmetsburg |
| Year | 4A | 3A | 2A-1A-A |
| 1981 | Cedar Rapids Washington | Atlantic | Mount Vernon |
| 1982 | Davenport Central | Marion Linn-Mar | Fairbank Wapsie Valley |
| Year | 4A | 3A | 2A | 1A-A |
| 1983 | Davenport Central | Cedar Rapids LaSalle | Packwood Pekin | |
| 1984 | Waterloo West | Marion | Grundy Center | Ogden |
| 1985 | Cedar Rapids Washington | Waterloo Columbus | Emmetsburg | Center Point |
| 1986 | West Des Moines Dowling | Harlan | Solon | Lynnville-Sully |
| 1987 | Urbandale | Decorah | Fairbank Wapsie Valley | Liberty Center Southeast Warren |
| 1988 | Bettendorf | Harlan | Fairbank Wapsie Valley | Grundy Center |
| Year | 4A | 3A | 2A | 1A | A |
| 1989 | Bettendorf | Harlan | Delhi Maquoketa Valley | Parkersburg | Preston |
| 1990 | Marion Linn-Mar | Harlan | Fairbank Wapsie Valley | Akron-Westfield | Logan-Magnolia |
| 1991 | West Des Moines Dowling | Spencer | Britt West Hancock | West Bend-Mallard | Logan-Magnolia |
| 1992 | Bettendorf | Pella | Sigourney-Keota | Aplington-Parkersburg | Madrid |
| 1993 | Bettendorf | Mount Pleasant | Solon | Aplington-Parkersburg | Bedford |
| 1994 | Davenport Assumption | New Hampton | Solon | Hudson | Le Mars Gehlen |
| 1995 | Iowa City West | Harlan | Iowa Falls | Pleasantville | Wellsburg-Steamboat Rock |
| 1996 | Iowa City High | Charles City | Aplington-Parkersburg | Britt West Hancock | Madrid |
| 1997 | West Des Moines Dowling | Grinnell and Decorah (tie) | Emmetsburg | Le Mars Gehlen | Madrid |
| 1998 | West Des Moines Valley | Decorah | Emmetsburg | Packwood Pekin | Maynard West Central |
| 1999 | Iowa City West | Harlan | Inwood West Lyon | State Center West Marshall | Madrid |
| 2000 | Cedar Falls | Denison-Schleswig | Solon | Aplington-Parkersburg | Manning |
| 2001 | West Des Moines Dowling | Grinnell | Sigourney-Keota | Aplington-Parkersburg | Hubbard-Radcliffe |
| 2002 | Sioux City Heelan | Atlantic | Williamsburg | Galva-Holstein | Treynor |
| 2003 | West Des Moines Valley | Harlan | Emmetsburg | Britt West Hancock | Treynor |
| 2004 | West Des Moines Valley | Harlan | Sigourney-Keota | Council Bluffs St Albert | Galva-Holstein |
| 2005 | West Des Moines Valley | Harlan | Sigourney-Keota | West Branch | West Bend-Mallard |