Note: Overall scores have been added where available. For quartets, that is 1949 on; for choruses, all scores are available from 1953 on.
| Year | Location | Chorus Representative(s) | Quartet | Quartet | Quartet | Quartet | Quartet |
| 2020 | No Contest | ||||||
| 2019 | Salt Lake City | Northbrook (23) – 80.3 Bloomington (27) – 77.7 | Interlude (32) – 80.0 | ||||
| 2018 | Orlando | Bloomington (21) – 81.1 CWS (30) – 73.1 | After Hours (1) – 94.7 | South of Normal (39) – 78.1 | OMG (45) – 76.8 | The Committee (50) – 75.1 | |
| 2017 | Las Vegas | Bloomington (20) – 82.5 | After Hours (3) – 91.1 | The Committee (46) – 77.0 | |||
| 2016 | Nashville | Bloomington (21) – 81.3 Northbrook (24) – 80.0 | After Hours (6) – 88.3 | Union Station (34) – 78.7 | |||
| 2015 | Pittsburgh | Bloomington (12) – 84.0 Northbrook (23) – 80.9 | After Hours (8) – 88.0 | ||||
| 2014 | Las Vegas | Bloomington (14) – 84.3 Northbrook (18T) – 83.2 | The Committee (53) – 72.7 | ||||
| 2013 | Toronto | Northbrook (11) – 82.7 Bloomington (16) – 81.2 | After Hours (8) – 85.1 | Velvet Hammer (47) – 75.1 | |||
| 2012 | Portland | Bloomington (16) – 82.7 | After Hours (16) – 83.5 | ||||
| 2011 | Kansas City | Bloomington (15) – 82.0 | After Hours (16) – 82.8 | Off the Record (29) – 78.6 | Rush Street (37) – 77.5 | ||
| 2010 | Philadelphia | Northbrook (21) – 80.8 Bloomington (24) – 79.3 | Off The Record (29) – 79.0 | ||||
| 2009 | Anaheim | Northbrook (15) – 83.9 Bloomington (21) – 79.8 | Rush Street (46) – 76.5 | ||||
| 2008 | Nashville | Northbrook (5) 87.7 Bloomington (21) – 79.1 CWS (22) – 78.6 | Voce (22) – 80.5 | Rush Street (T35) – 78.5 | |||
| 2007 | Denver | Northbrook (5) 87.7 CWS (23) – 79.5 | Rush Street (30) – 78.6 | Alchemy (31) – 78.4 | |||
| 2006 | Indianapolis | Northbrook (4) – 89.4 CWS (18) – 79.5 Lake County (24) – 77.5 | Alchemy (38) – 77.5 | ||||
| 2005 | Salt Lake City | Northbrook (3) – 90.8 | Alchemy (21) – 80.6 | Lakeside Edition (31) – 78.2 | |||
| 2004 | Louisville | Northbrook (3) – 90.4 | Alchemy (21) – 78.6 | ||||
| 2003 | Montreal | Chicagoland West Suburban (19) – 76.2 | Cheers (6) – 84.8 | ||||
| 2002 | Portland | Lake County (16) – 81.8 | Cheers (11) – 81.8 | Gangbusters (29) – 76.9 | |||
| 2001 | Nashville | Northbrook (1) – 93.7 Lake County (5) – 87.9 | Cheers (12) – 82.7 | Common Ground (21) – 79.5 | By Popular Demand (44) – 75.0 | ||
| 2000 | Kansas City | Northbrook (2) – 93.4 Lake County (3) – 90.0 | By Popular Demand (22) – 79.1 | Sharper Image (30) – 76.7 | |||
| 1999 | Anaheim | Northbrook (2) – 94.0 | Sharper Image (22) – 78.7 | By Popular Demand (26) – 78.1 | Bravo! (32) – 76.6 | ||
| 1998 | Atlanta | Northbrook (2) – 92.5 | Sharper Image (15) – 82.1 | ||||
| 1997 | Indianapolis | Northbrook (2) – 93.8 | Genuine Craft (15) – 81.4 | ||||
| 1996 | Salt Lake City | Northbrook (2) – 92.5 Lombard (14) – 81.6 | Common Ground (18) – 81.5 | Chicago Nights (33) – 76.6 | Renaissance (34) – 76.6 | ||
| 1995 | Miami | Northbrook (2) – 90.7 Lombard (13) – 79.5 | Common Ground (12) – 79.4 | Echo Lane (16) – 77.8 | Renaissance (18) – 76.8 | Short Term Agreement (44) – 71.1 | |
| 1994 | Pittsburgh | Northbrook (2) – 93.1 Lombard (11) – 82.7 | Echo Lane (19) – 79.9 | Reunited (23) – 76.4 | Renaissance (29) – 73.8 | Grand Slam (32) – 73.1 | |
| 1993 | Calgary | Northbrook (2) – 96.1 Lombard (7) – 90.0 | Echo Lane (16) – 84.6 | Classic Ring (24) – 80.1 | Renaissance (28) – 79.2 | ||
| 1992 | New Orleans | Northbrook (5) – 92.6 Lombard (6) – 90.5 | Piper’s Alley (31) – 79.5 | Classic Ring (33) – 79.2 | |||
| 1991 | Louisville | Northbrook (4) – 89.7 | Chordiac Arrest (15) – 81.3 | Classic Ring (21) – 80.2 | |||
| 1990 | San Francisco | Northbrook (3) – 86.3 | Chicago Chord of Trade (7) – 93.7 | Chordiac Arrest (9) – 90.8 | Debut (23) – 84.9 | ||
| 1989 | Kansas City | Northbrook (3) – 89.2 | Chordiac Arrest (5) – 92.3 | Chicago Chord of Trade (8) – 91.4 | Debut (19) – 85.5 | Four Star Revue (37) – 80.3 | |
| 1988 | San Antonio | Northbrook (4) – 87.4 | Chiefs of Staff (1) – 97.7 | Chicago Chord of Trade (3) – 96.0 | Chordiac Arrest (5) – 92.8 | Benchmarks (40) – 79.0 | |
| 1987 | Hartford | Lombard (1) – 90.8 | Chiefs Of Staff (3) – 94.4 | Chicago Chord of Trade (5) – 91.9 | Chordiac Arrest (9) – 89.1 | ||
| 1986 | Salt Lake City | Lombard (2) – 89.9 | Chiefs of Staff (5) – 92.5 | Benchmarks (12) – 86.0 | |||
| 1985 | Minneapolis | Lombard (2) – 91.4 | Chiefs of Staff (12) – 82.7 | Benchmarks (19) – 79.3 | Chicago Chord of Trade (30) – 74.4 | ||
| 1984 | St. Louis | Lombard (2) – 91.6 | Benchmarks (19) – 83.7 | Heart of Chicago (21) – 82.1 | At Ease (24) – 81.3 | ||
| 1983 | Seattle | Lombard (3) – 85.5 | Four Henchmen (11) – 85.4 | Tin Pan Allies (12) – 85.2 | Benchmarks (21) – 82.5 | ||
| 1982 | Pittsburgh | Lombard (4) – 77.8 | Tin Pan Allies (10) – 85.5 | Friends (15) – 85.3 | Four Henchmen (18) – 85.3 | ||
| 1981 | Detroit | Arlington Heights (8) – 75.8 | Chicago News (1) – 94.0 | Friends (13) – 82.8 | Tin Pan Allies (19) – 80.2 | Four Penny Opera (20) – 78.3 | |
| 1980 | Salt Lake City | Arlington Heights (7) – 81.5 | Chicago News (2) – 93.5 | Friends (12) – 82.1 | Four Penny Opera (21) – 77.3 | ||
| 1979 | Minneapolis | Arlington Heights (6) – 75.7 | Grandma’s Boys (1) – 96.3 | Chicago News (8) – 88.9 | Chords Unlimited (22) – 75.1 | Chicago Express (26) – 74.5 | |
| 1978 | Cincinnati | Arlington Heights (7) – 76.8 | Grandma’s Boys (2) – 93.8 | Chords Unlimited (16) – 77.3 | Valley Four-gers (45) – 65.2 | ||
| 1977 | Philadelphia | Bloomington (10) – 72.6 | Grandma’s Boys (7) – 91.1 | Chicago Express (17) – 81.0 | Valley Four-gers (39) – 69.8 | ||
| 1976 | San Francisco | Arlington Heights (11) – 69.1 | Grandma’s Boys (6) – 87.6 | Saturday’s Heroes (8) – 84.3 | Soundtracks (14) – 81.0 | Chords Unlimited (19) – 77.9 | |
| 1975 | Indianapolis | Arlington Heights (5) – 75.9 | Grandma’s Boys (3) – 92.0 | Soundtracks (6) – 89.1 | Saturday’s Heroes (13) – 80.8 | ||
| 1974 | Kansas City | Arlington Heights (5) – 75.0 | Soundtracks (5) – 88.4 | Grandma’s Boys (10) – 84.7 | Saturday’s Heroes (11) – 84.3 | ||
| 1973 | Portland | Arlington Heights (5) – 81.2 | Saturday’s Heroes (8) – 86.5 | Soundtracks (10) – 84.8 | Chords Unlimited (15) – 79.7 | ||
| 1972 | Atlanta | Lombard (11) – 68.1 | Soundtracks (6) – 85.6 | Grandma’s Boys (14) – 82.0 | Chords Unlimited (27) – 73.8 | Ideals (39) – 66.8 | |
| 1971 | New Orleans | Lombard (8) – 79.6 | Sundowners (2) – 97.3 | Avant Garde (7) – 86.7 | Grandma’s Boys (10) – 84.3 | Soundtracks (16) – 80.7 | |
| 1970 | Atlantic City | Lombard (10) – 78.3 | Sundowners (2) – 93.2 | Grandma’s Boys (11) – 80.3 | Chords Unlimited (31) – 72.5 | Barbersharps (38) – 68.6 | |
| 1969 | St. Louis | Arlington Heights (9) – 77.3 | Sundowners (3) – 93.7 | Avant Garde (5) – 88.9 | Chords Unlimited (25) – 76.3 | ||
| 1968 | Cincinnati | Pekin (1) – 88.7 | Sundowners (4) – 90.6 | Avant Garde (5) – 89.4 | Barbersharps (20) – 73.4 | ||
| 1967 | Los Angeles | Peoria (8) – 73.9 | Sundowners (4) – 91.4 | Avant Garde (8) – 85.3 | Varieties (34) – 65.4 | ||
| 1966 | Chicago | Arlington Heights (7) – 77.0 | Sundowners (5) – 85.4 | Varieties (30) – 67.7 | Barbersharps (33) – 66.0 | ||
| 1965 | Boston | Arlington Heights (7) – 79.1 | Four Renegades (1) – 99.2 | Imposters (3) – 91.1 | Tune Tippers (41) – 65.6 | ||
| 1964 | San Antonio | Arlington Heights (6) – 81.4 | Four Renegades (2) – 94.2 | Imposters (5) – 88.9 | Four Boot ‘N Aires (40) – 64.3 | ||
| 1963 | Toronto | Pekin (1) – 86.5 | Four Renegades (4) – 96.2 | Imposters (6) – 93.6 | Varieties (17) – 84.2 | ||
| 1962 | Kansas City | Pekin (3) – 88.1 | Four Renegades (4) – 96.5 | Imperial Four (21) – 79.4 | Notations (27) – 77.5 | ||
| 1961 | Philadelphia | Lombard (5) – 83.7 | Four Renegades (7) – 93.0 | Imperial Four (36) – 75.0 | Keytonics (41) – 71.6 | ||
| 1960 | Dallas | Bloomington (4) – 84.3 | Four Renegades (9) – 88.7 | Four Barons (20) – 80.6 | Imperial Four (35) – 71.8 | ||
| 1959 | Chicago | Pekin Chorus (1) – 94.1 | Vi-Counts (10) – 86.8 | Timbre Kings (15) – 86.1 | Four Barons (31) – 73.4 | ||
| 1958 | Columbus | Pekin (2) – 94.7 | Timbre Kings (9) – 85.6 | Escapades (12) – 82.9 | Four Renegades (13) – 82.8 | ||
| 1957 | Los Angeles | Bloomington (3) – 86.5 | Four Renegades (10) – 85.3 | Kord Kings (14) – 80.1 | Heart of Illinois Four (19) – 81.1 | ||
| 1956 | Minneapolis | Pekin (4) – 87.2 | Kord Kings (7) – 87.3 | Kord Kutters (10) – 84.0 | Barber-Q-Four (20) – 77.2 | Melodaires (27) – 72.7 | |
| 1955 | Miami | Oak Park (4) – 85.8 | Four-Tissimos (3) – 92.5 | Air Fours (4) – 89.1 | Barber-Q-Four (6) – 90.3 | Kord Kings (8) – 87.9 | |
| 1954 | Washington, D.C. | Q-Suburban (4) – 90.0 Skokie Valley (6) – 88.1 | Barber-Q-Four (8) – 90.2 | Chicagoans (13) – 84.4 | Kord Kings (17) – 81.9 | Lancers (27) – 77.1 | |
| 1953 | Detroit | Q-Suburban (3) – 83.2 | Vikings (1) – 99.6 | Kord Kings (9) – 91.6 | Chicagoans (15) – 88.5 | Kord Kutters (20) – 85.6 | |
| 1952 | Kansas City | None | Vikings (2) – 96.4 | Chicagoans (12) – 90.2 | Keymen (15) – 89.2 | N.I. Collegiates (29) – 83.9 | |
| 1951 | Toledo | None | Village-Aires (6) – 87.5 | Vikings (9) – 83.5 | N.I. Collegiates (18) – 82.6 | Chicagoans (22) – 79.3 | Kord Kings (33) – 68.5 |
| 1950 | Omaha | None | Village-Aires (6) – 75.8 | Chicagoans (7) – 75.0 | Vikings (10) – 74.2 | N.I. Collegiates (18) – 70.3 | Barber-Q-Four (25) – 65.3 |
| 1949 | Buffalo | None | Mid-States Four (1) – 79.8 | Chicagoans (12) – 64.4 | Vikings (14) – 62.7 | Four Flushers (19) | Big Towners (22) |
| 1948 | Oklahoma City | None | Mid-States Four (2) | Chordoliers (7) | Big Towners (15) | Chicagoans (23) | Mellow Fellows ? (37) |
| 1947 | Milwaukee | None | Mid-States Four (3) | Chordoliers (4) | Big Towners (12) | Mellow Men (21) | |
| 1946 | Cleveland | None | Chordoliers (4) | Gipps-Amberlin Four (19) | Mid-States 4 (23) | Morgan County Four (24) | Smeets Brothers (28) |
| 1945 | Detroit | None | Misfits (1) | Bell & Howell Four (6) | Chordoliers (7) | Gipps-Amberlin Four (11) | |
| 1944 | Detroit | None | Misfits (2) | Gipps-Amberlin Four (4) | Harmony Kings (9) | Chordoliers (11) | Victory 4 Chordsmen (26) |
| 1944 | Whiz Candy Makers (35) | Gipps-Amberlin Antiques (43) | Sangamon Electric Co. (54) | Four Flats (52) | |||
| 1943 | Chicago | None | Four Harmonizers (1) | Harmony Kings (6) | Gipps-Amberlin Four (8) | Morgan County Four (11) | |
| 1943 | Capitol City Four (23) | Whiz Candy Makers (24) | Peoria Wolves (43) | Antique Four (51) | |||
| 1942 | Grand Rapids | None | Elastic Four (1) | Harmony Kings (4) | Misfits (5) | Whiz Candy Makers (10) | Peoria Wolves (27) |
| 1941 | St. Louis | None | Harmony Kings (4) | Capitol City Four (5) | Four Harmonizers (9) | Gipps-Amberlin Four (16) | Jolly Four (17) |
| 1940 | New York | None | Plow City Four (13) | ||||
| 1939 | Tulsa | None | Capitol City Four (2) | Rock Island Rockets (17) |
