School | Location | Mascot | Colors | County | Year Joined | Previous Conference | Year Left | Conference Joined |
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Argenta-Oreana High School | Argenta, Illinois | Bombers | orange}} {{color box|royalblue}} | Macon | 1971 | 1983 |
Armstrong High School | Armstrong, Illinois | Trojans | purple}} {{color box|gold}} | Vermilion | 1999 | 2004 | Vermilion Valley |
Bellflower High School | Bellflower, Illinois | Dragons | green}} {{color box|white}} | McLean | 1948 | Tri-Valley | 1985 | Kickapoo |
Blue Ridge High School | Farmer City, Illinois | Knights | royalblue}} {{color box|silver}} | DeWitt | 1985 | none (new school) | 2006 | Heart of Illinois |
DeLand-Weldon High School1 | De Land, Illinois | Eagles | maroon}} {{color box|gray}} | Piatt | 1948 | 1983 |
Fairbury-Cropsley High School | Fairbury, Illinois | Tartars | green}} {{color box|gold}} | Livingston | 1971 | 1985 | none (consolidated into Prairie Central |
Farmer City High School | Farmer City, Illinois | Farmers | purple}} {{color box|white}} | DeWitt | 1948 | 1971 | none (consolidated into Farmer City-Mansfield) |
Farmer City-Mansfield High School | Farmer City, Illinois | Blue Devils | blue}} {{color box|white}} | DeWitt | 1971 | none (new school) | 1985 | none (consolidated into Blue Ridge) |
Fisher High School | Fisher, Illinois | Bunnies | orange}} {{color box|black}} | Champaign | 1949 | 2006 | Heart of Illinois |
Ford Central High School | Piper City, Illinois | Cougars | lightblue}} {{color box|gold}} | Livingston | 1989 | Vermilion Valley | 1992 | none (consolidated into Tri-Point) |
Forrest-Strawn-Wing High School | Forrest, Illinois | Eskimos | red}} {{color box|black}} | Livingston | 1983 | Vermilion Valley | 1985 | none (consolidated into Prairie Central |
Gibson City High School | Gibson City, Illinois | Greyhounds | maroon}} {{color box|silver}} | Ford | 1990 | Wauseca | 1993 | none (consolidated into Gibson City-Melvin-Sibley) |
Gibson City-Melvin-Sibley High School | Gibson City, Illinois | Falcons | red}} {{color box|black}} | Ford | 1993 | none (new school) | 2006 | Heart of Illinois |
Heyworth High School | Heyworth, Illinois | Hornets | crimson}} {{color box|black}} | McLean | 1955 | 1997 | Mid-State |
Hoopeston Area High School | Hoopeston, Illinois | Cornjerkers | blue}} {{color box|white}} | Vermilion | 1997 | 2004 | Vermilion Valley |
LeRoy High School | LeRoy, Illinois | Panthers | maroon}} {{color box|gold}} | McLean | 1948 | 2006 | Heart of Illinois |
Mahomet-Seymour High School | Mahomet, Illinois | Bulldogs | orange}} {{color box|navy}} | Champaign | 1948 | 1976 | Okaw Valley |
Mansfield High School | Mansfield, Illinois | Cardinals | red}} {{color box|white}} | Piatt | 1948 | 1971 | none (consolidated into Farmer City-Mansfield) |
Milford High School | Milford, Illinois | Bearcats | blue}} {{color box|white}} | Iroquois | 1997 | 2006 | Vermilion Valley |
Octavia High School | Colfax, Illinois | Rockets | maroon}} {{color box|white}} | McLean | 1955 | Kickapoo | 1989 | none (consolidated into Ridgeview) |
Paxton High School | Paxton, Illinois | Mustangs | blue}} {{color box|gold}} | Ford | 1990 | Wauseca | 1991 | none (consolidated into Paxton-Buckley-Loda) |
Ridgeview High School | Colfax, Illinois | Mustangs | navy}} {{color box|silver}} | McLean | 1989 | none (new school) | 1997 | Mid-State |
Rossville-Alvin High School | Rossville, Illinois | Bobcats | red}} {{color box|black}} | Vermilion | 1997 | 2005 | none (consolidated into Hoopeston) |
St. Joseph-Ogden High School | St. Joseph, Illinois | Spartans | maroon}} {{Color box|lightblue|border=darkgray}} | Champaign | 2006 | 2014 | Okaw Valley |
St. Thomas More High School | Champaign, Illinois | Sabers | gold}} {{color box|green}} | Champaign | 2004 | 2014 | Okaw Valley |
Saybrook-Arrowsmith High School | Saybrook, Illinois | Comanches | red}} {{color box|white}} | McLean | 1955 | Kickapoo | 1976 | Kickapoo |
South Newton High School | Kentland, Indiana | Rebels | red}} {{color box|gray}} {{color box|white}} | Newton (IN) | 2015 | Midwest (IN) | 2018 | Midwest (IN) |
Tri-Point High School | Cullom, Illinois | Chargers | red}} {{color box|blue}} | Livingston | 2006 | Mid-State | 2011 | River Valley |
Tri-Valley High School | Downs, Illinois | Vikings | blue}} {{color box|gold}} | McLean | 1983 | 2006 | Heart of Illinois |
University High School | Urbana, Illinois | Illineks | royalblue}} {{color box|orange}} | Champaign | 1997 | 2003 | East Central Illini |
Wapella High School | Wapella, Illinois | Wildcats | blue}} {{color box|white}} | DeWitt | 1949 | 1955 | Kickapoo |
Weldon High School | Weldon, Illinois | Wildcats | blue}} {{color box|white}} | DeWitt | 1948 | 1949 | none (consolidated into DeLand-Weldon) |
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1. ^Sangamon Valley Conference Constitution & By-Laws {{webarchive|url=https://archive.is/20140209200907/http://www.pblunit10.com/jeo/const.htm |date=2014-02-09 }}
2. ^{{cite web|url=http://www.newsbug.info/newton_county_enterprise/article_958c2aee-87e9-11e3-b653-0019bb2963f4.html |title=South Newton Joining Illinois Conference |publisher=Newton County Times |date=2014-01-28 |accessdate=2014-02-07}}