The following is a list of Illinois High School Association member conferences. Schools that belong to these conferences compete with each other on a local level in athletics and non-athletic activities. As of the 2023-24 school year, there are 70 conferences within the IHSA.
Current Conferences Apollo Conference Big Northern Conference Big Twelve Conference Black Diamond Conference Cahokia Conference (contains three divisions) Central Illinois Conference Central State Eight Conference Central Suburban League (contains two divisions) Chicago Catholic League (contains two divisions) Chicago Prep Conference Chicago Public High School League (contains ten divisions) Chicagoland Christian Conference DuKane Conference DuPage Valley Conference East Central Illinois Conference Egyptian Illini Conference Fox Valley Conference Gateway Metro Conference Girls Catholic Athletic Conference Greater Egyptian Conference Heart of Illinois Conference Illini Prairie Conference Illinois Central Eight Conference Independent School League Inter County Athletic Conference Interstate Eight Conference Kishwaukee River Conference Lake Shore Athletic Conference Lincoln Prairie Conference Lincoln Trail Conference Little Illini Conference Little Okaw Valley Conference Little Ten Conference Metropolitan Prep Conference Mid-Illini Conference Midland Trail Conference Mid-Suburban League (contains two divisions) Mississippi Valley Conference MSM Conference National Trail Conference Noble Athletic Conference North Suburban Conference Northeastern Athletic Conference Northern Illinois Conference (NIC-10) Northern Lake County Conference Northwest Upstate Illini Conference (contains two divisions) Pike County Conference Prairieland Conference River Valley Conference Sangamo Conference South Central Conference (Illinois) South Egyptian Conference South Seven Conference South Suburban Conference Southern Illinois River-to-River Conference (with Mississippi and Ohio River divisions) Southland Athletic Conference Southwest Prairie Conference (contains two divisions) Southwest Suburban Conference Southwestern Conference Three Rivers Conference Tomahawk Conference (Illinois) Tri-County Conference Upstate Eight Conference (contains two divisions) Vermilion Valley Conference West Central Conference West Suburban Conference (contains two divisions) Western Big 6 Conference Western Illinois Valley Conference (contains two divisions)
Former conferences Ambraw Valley Conference (1945-1955) Big 8 (1980-1995) Big Rivers Conference (football-only) (1999-2012) Bi-County Conference (1917-1919) Bi-County Conference (1970s-1998) Blackhawk Conference (West) (1934-1990) Blackhawk Conference (North) (1947-1972) Bureau Valley Conference (1970s-1990s) Capitol Conference (1964-1982) Cenois Conference (1963-1969) Central Conference (1956-1958) Central Egyptian Conference (1929-1940) Chicagoland Prep Conference (1961-1969) Coal Belt Conference (1946-1956) Cook County High School League (1889–1913) Corn Belt Conference (1950–2017) Des Plaines Valley Conference (1963-1985) East Okaw Conference (1981-1995) East Suburban Catholic Conference (1974-2026) Eastern Illinois Conference (1952-1969) Four Rivers Conference (2000-2006) Fox Valley Conference (1952-1966) Gateway East Conference (1979-1983) Greater Midwestern Conference (1983-1986) Heartland Conference (Illinois) (1978-1982) Heart of Illinois Conference (1970s) (1972–1978) Illini Central Conference (1985-1998) Illini 8 Conference (1966-1981) Illini Valley Conference (North Central) (1970-1972) Illini Valley Conference (South Central) (1928-1973) Illio Conference (1952-1975) Illowa Conference (1952-1974) Indian Valley Conference (1976-1994) Iroquois Conference (1970s-1980s) Kane County Conference (????-1917) Kankakee Valley Conference (1950-1979) La Moine Valley Conference (1952-1967) Little 6 Conference (1952–1975) Little 7 Conference (1921–1995) Little 8 Conference (North Central) (1921–1975) Little 8 Conference (Far North) (1920s–1980) Little 8 Conference (Northeast) (1919–19??) Little 8 Conference (Northwest) (1918–192?) Little 8 Conference (Southwest) (????–????) Little Egypt Conference (1960s-1970s) Little Five Conference (1923-1939) Little Four Conference (19??'s-1948) Meridian Conference (Central Illinois) (1959-1993) Meridian Conference (Northern Illinois) (????-????) Metro Catholic Conference (1960-1965) Metro Suburban Conference (2006-2024) Mid Northern Conference (1972-1995) Mid-South Conference (1983-2008) Mid-State Conference (1944-1997) Mid-State Six Conference (196?-2015) Midwest Conference (1948-1970) Midwestern Conference (1952-1970) Mississippi Valley Conference (1957-1968) New Salem Conference North Central Illinois Conference (1929-2011) North Egypt Conference (1938-2003) North Shore Conference (1904-1914) North Six Conference (1939-1946) Northern Illinois Big 12 Conference (2010-2018) Northwest Conference (1963-1974) Northwest Illinois Conference (NWIC) (1974-1996) Northwest 7 Conference (1972-1973) Northwest 8 Conference (1977-1990) Northwest Suburban Conference (1925-1997) Okaw Valley Conference (1950s-2017) Olympic Conference (1976-2010) PMSC Conference (1961-1973) Prairie State Conference (1985-????) Quad Cities Metro Conference (1950-1977) River Trails Conference (1990-1995) Rock River (Valley) Conference (1924-1948) Route 72 Conference (1952-1972) Sangamon Valley Conference (1948-2021) SHARK Conference (1946-1982) SICA — (South Inter-Conference Association, dissolved 2006) Southeast Suburban Conference (1962-1972) Southern Conference (IHSA) (????-????) Southern Illini Conference (1957-1974) Southern Illini Conference (1986-1993) Southwest Egyptian Conference (????-1993) Spoon River Conference (1959-1985) Stephenson County Conference (1958-1963) (Renamed "Northwest Illinois Conference") Suburban Catholic Conference (1960-1973) Suburban Catholic Conference (2009-2015) Suburban League (1913–1975) Suburban Prairie Conference (1995-2005) SWANI Conference (1946-1953) Tollway Athletic Conference Trailblazer Conference (1982-1984) Tri State Conference (1932-1935) Two Rivers Conference (19??-1958) United Conference (1958-1963) Upstate Illini Conference (1974-1976) Upstate Illini Conference (1991-2000) US Grant Conference (1950-1958) Vermilion Valley Conference (1950-1981) Wauseca Conference (1928-1989) West Prairie Trail Conference Western Area Conference (1974-1996) Western Athletic Conference (1908-1921) Western Sun Conference (2006-2010) Western Suburban Athletic Conference (1903-1910) Western Suburban Catholic Conference (1974-1988) Wilco Conference (1959-1973) Wil-Ro-Kee Conference (1954-1959) (Renamed "Kankakee Valley Conference" in 1960)
External links Illinois High School Association, Official Site IHSA Conferences and Leagues