| 33 Playoff Appearances
(Playoffs Began in 1974) 61 Wins - 28 Losses 4 State Championships 1976, 1977, 1978, 1982 8 Championship Game Appearances 1976, 1977, 1978, 1981, 1982, 1990, 1992, 1993 13 Semifinal Appearances 1975, 1976, 1977, 1978, 1979, 1981, 1982, 1990, 1992, 1993, 1998, 1999, 2004 20 Quarterfinal Appearances 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1985, 1990, 1992, 1993, 1997, 1998, 1999, 2000, 2004, 2008 |
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| 2006 |
| 5A - 1st Round Rochelle 14 Geneseo 0 |
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| 2005 |
| 5A - 1st Round Johnsburg 24 Geneseo 22 |
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| 2004 |
| 5A - 1st Round Geneseo 36 Arlington Heights (St. Viator) 28 |
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| 5A - 2nd Round Geneseo 27 Rochelle 0 |
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| 5A - Quarterfinals Geneseo 14 Rock Island (Alleman) 0 |
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| 5A - Semifinals Morris 35 Geneseo 0 |
| 2003 |
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| 5A - 1st Round Riverside-Brookfield 31 Geneseo 30 |
| 2002 |
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| 5A - 1st Round Geneseo 41 Yorkville 32 |
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| 5A - 2nd Round Rochelle 41 Geneseo 25 |
| 2001 |
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| 5A - 1st Round Geneseo 24 Olympia Fields (Rich Central) 22 |
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| 5A - 2nd Round Riverside-Brookfield 54 Geneseo 27 |
| 2000 |
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| 4A - 1st Round Geneseo 45 Urbana 28 |
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| 4A - 2nd Round Geneseo 44 Dixon 30 |
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| 4A - Quarterfinals Metamora 22 Geneseo 17 |
| 1999 |
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| 4A - 1st Round Geneseo 42 Kankakee (McNamara) 21 |
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| 4A - 2nd Round Geneseo 35 Peoria (Richwoods) 25 |
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| 4A - Quarterfinals Geneseo 14 Peoria (Notre Dame) 3 |
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| 4A - Semifinals Joliet (Catholic Academy) 28 Geneseo 14 |
| 1998 |
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| 4A - 1st Round Geneseo 24 Normal (Community) 23 |
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| 4A - 2nd Round Geneseo 26 Morris 14 |
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| 4A - Quarterfinals Geneseo 17 Aurora (Marmion Academy) 6 |
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| 4A - Semifinals Chatham (Glenwood) 37 Geneseo 34 |
| 1997 |
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| 4A - 1st Round Geneseo 48 Chicago (Leo) 25 |
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| 4A - 2nd Round Geneseo 10 Lisle (Benet) 0 |
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| 4A - Quarterfinals New Lenox (Providence) 45 Geneseo 0 |
| 1996 |
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| 4A - 1st Round Geneseo 20 Richton Park. (Rich South) 19 |
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| 4A - 2nd Round Riverside-Brookfield 34 Geneseo 27 |
| No Helmet |
| 1994 |
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| 4A - 1st Round Geneseo 28 Freeport 6 |
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| 4A - 2nd Round Sterling 13 Geneseo 12 |
| No Helmet |
| 1993 |
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| 4A - 1st Round Geneseo 30 Peoria (Richwoods) 6 |
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| 4A - 2nd Round Geneseo 35 Peoria (Manual) 13 |
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| 4A - Quarterfinals Geneseo 20 Springfield (SHG) 3 |
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| 4A - Semifinals Geneseo 60 Jerseyville 13 |
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| 4A - Championship Chicago Heights (Marian) 13 Geneseo 6 |
| 1992 |
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| 4A - 1st Round Geneseo 13 Peoria (Manual) 10 |
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| 4A - 2nd Round Geneseo 13 Rock Falls 3 |
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| 4A - Quarterfinals Geneseo 27 Peoria (Notre Dame) 10 |
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| 4A - Semifinals Geneseo 7 Decatur (Eisenhower) 6 |
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| 4A - Championship Oswego 14 Geneseo 6 |
| No Helmet |
| 1991 |
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| 4A - 1st Round Peoria (Notre Dame) 17 Geneseo 13 |
| 1990 |
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| 4A - 1st Round Geneseo 34 Metamora 7 |
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| 4A - 2nd Round Geneseo 24 Peoria 0 |
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| 4A - Quarterfinals Geneseo 42 Rantoul 15 |
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| 4A - Semifinals Geneseo 34 Carbondale 21 |
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| 4A - Championship Joliet (Catholic Academy) 21 Geneseo 20 |
| 1989 |
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| 4A - 1st Round Peoria 6 Geneseo 0 |
| 1988 |
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| 4A - 1st Round Rockford (West) 21 Geneseo 16 |
| No Helmet |
| 1987 |
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| 4A - 1st Round Geneseo 27 Peoria (Woodruff) 7 |
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| 4A - 2nd Round Rockton (Hononegah) 17 Geneseo 14 |
| 1986 |
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| 4A - 1st Round Rock Island (Alleman) 10 Geneseo 7 |
| 1985 |
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| 4A - 1st Round Geneseo 27 Rock Island (Alleman) 7 |
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| 4A - 2nd Round Geneseo 14 Peoria (Spalding) 7 |
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| 4A - Quarterfinals Washington 14 Geneseo 12 |
| No Helmet |
| 1983 |
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| 4A - 1st Round Geneseo 12 Rock Island (Alleman) 7 |
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| 4A - Quarterfinals Morris 17 Geneseo 6 |
| 1982 |
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| 4A - 1st Round Geneseo 14 Rockton (Hononegah) 8 |
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| 4A - Quarterfinals Geneseo 26 Peoria (Spalding) 3 |
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| 4A - Semifinals Geneseo 46 Lombard (Montini) 15 |
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| 4A - Championship Geneseo 44 Springfield (Griffin) 36 |
| 1981 |
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| 4A - 1st Round Geneseo 21 Canton 12 |
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| 4A - Quarterfinals Geneseo 21 Plainfield 7 |
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| 4A - Semifinals Geneseo 10 Roxana 0 |
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| 4A - Championship Wheaton (North) 14 Geneseo 0 |
| 1980 |
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| 4A - 1st Round Geneseo 20 Rock Island (Alleman) 14 |
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| 4A - Quarterfinals DeKalb 30 Geneseo 8 |
| 1979 |
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| 3A - 1st Round Geneseo 28 Herscher 6 |
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| 3A - Quarterfinals Geneseo 30 Macomb 13 |
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| 3A - Semifinals Morris 14 Geneseo 8 |
| No Helmet |
| 1978 |
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| 3A - 1st Round Geneseo 20 Rockton (Hononegah) 0 |
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| 3A - Quarterfinals Geneseo 21 Elmhurst (Immac. Conception) 16 |
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| 3A - Semifinals Geneseo 25 Sycamore 8 |
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| 3A - Championship Geneseo 14 Kankakee (McNamara) 7 |
| 1977 |
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| 3A - 1st Round Geneseo 18 Rochelle 6 |
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| 3A - Quarterfinals Geneseo 55 Kankakee (McNamara) 8 |
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| 3A - Semifinals Geneseo 21 Geneva 14 |
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| 3A - Championship Geneseo 34 Metamora 0 |
| 1976 |
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| 3A - 1st Round Geneseo 34 New Lenox (Providence) 6 |
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| 3A - Quarterfinals Geneseo 35 Lisle 6 |
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| 3A - Semifinals Geneseo 25 Sycamore 6 |
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| 3A - Championship Geneseo 20 Metamora 12 |
| No Helmet |
| 1975 |
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| 3A - 1st Round Geneseo 29 Harvard 7 |
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| 3A - Quarterfinals Geneseo 15 Aurora (Marmion Academy) 14 |
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| 3A - Semifinals Geneva 14 Geneseo 0 |
| 1974 |
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| 3A - 1st Round Geneseo 37 Aurora (Central Catholic) 22 |
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| 3A - Quarterfinals West Chicago 3 Geneseo 0 |
| No Helmet |
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| 2007 |
| 5A - 1st Round Geneseo 28 LaSalle-Peru 21 |
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| 5A - 2nd Round La Grange Park (Nazareth) 35 Geneseo 27 |
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| 2008 |
| 4A - 1st Round Geneseo 45 Melrose Park (Walther Lutheran) 33 |
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| 4A - 2nd Round Geneseo 16 Kankakee (McNamara) 14 |
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| 4A - Quarterfinals Richmond-Burton 21 Geneseo 0 |