| Year | Contest Site | Quartet | College(s) | Placed |
| 2012 | Portland, OR | No entry | ||
| 2011 | Kansas City | After Hours | Bradley | 3rd |
| 2010 | Philadelphia | After Hours | Bradley | 6th |
| 2009 | Anaheim | Upturn | ? | 25th |
| 2008 | Nashville | Nobody’s Afterthought | Illinois Wesleyan/U of Illinois | 19th |
| 2007 | Denver | The Aboriginals | Illinois Wesleyan | 21st |
| 2006 | Indianapolis | Tesseract | U of Illinois | 14th |
| 2005 | Salt Lake City | Tesseract | U of Illinois | 18th |
| 2004 | Louisville | No entry | ||
| 2003 | Montreal | Vocal Tonic | Harper/U of Illinois/Western Illinois/Concordia | 2nd |
| 2002 | Portland, OR | FOURtunes Fools | Northwestern | 6th |
| 2001 | Nashville | Vocal Tonic | Harper/U of Illinois/Western Illinois/Concordia | 6th |
| 2000 | Kansas City | Bored of Education | SIU-Edwardsville/Millikin/Mt. Zion H.S. | 19th |
| 1999 | Anaheim | PARR for the Course | Eastern Illinois/Mt. Zion H.S. | 14th (tie) |
| 1998 | Atlanta | Recently Delinquent Minors | North Central/College of DuPage/Wheaton | ? – * |
| 1997 | Indianapolis | Academia Nuts | Iowa St./Muscatine C.C./Muscatine H.S. | 5th |
| 1996 | Salt Lake City | No entry | ||
| 1995 | Miami Beach | No entry | ||
| 1994 | Pittsburgh | By Popular Demand | ? | 8th |
* – Note: In 1997 and 1998, quartet scores and ranks for quartets outside the Top 5 were not published.
