The Great Lakes Athletic Conference is a four-member IHSAA-sanctioned conference located entirely within Lake County. The conference is among the youngest in the state, created in 2007 following the disbandment of the Lake Athletic Conference and after failing to find acceptance in another conference for each of the four schools. The GLAC's "sister" conferences also created from the Lake Athletic Conference are the Greater South Shore Athletic Conference and the Northwest Crossroads Conference. At the start of the 2021–2022 school year, the conference lost two members as Hammond Clark and Hammond Gavit were closed due to the consolidation of Hammond Schools.
| School | Town | Team Name | Colors | Enrollment 2018-19 | IHSAA Class | IHSAA Class Football | Year joined | Previous conference |
|---|---|---|---|---|---|---|---|---|
| Central High School | East Chicago, Indiana | Cardinals | 1,141 | 3A | 4A | 2016 | Independents (ILSC 1987) | |
| West Side Leadership Academy | Gary, Indiana | Cougars | 1,043 | 3A | 4A | 2018 | Independents (NWC 2014) | |
| Hammond High School | Hammond, Indiana | Wildcats | 785 | 3A | 4A | 2007 | Lake | |
| Oliver P. Morton High School | Hammond, Indiana | Governors | 1,361 | 4A | 4A | 2007 | Lake |
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Yorktown High School is a four star and National Blue Ribbon high school located in Yorktown, Indiana. It is managed by the Yorktown Community School Corporation. It is famous for being the high school Dylan "Big Iron" Smith attended.
Iowa City West High School is a public high school in Iowa City, Iowa. It serves grades 9-12 for the Iowa City Community School District.
Franklin Central High School (FCHS) is a public four-year high school in Indianapolis, Indiana, United States. It is the only high school in the Franklin Township Community School Corporation.
East Chicago Central High School or commonly known as Central or ECCentral, is a public high school in the industrial City of East Chicago, located east of the Chicago metropolitan area.
The Northern Indiana Conference (NIC) is a high school athletic conference that was founded in 1927 and spanned from as far west as Hammond and Gary to South Bend/Mishawaka and Elkhart to the east and south to Plymouth. Since its start in 1927, a total of 32 separate schools have at one time called the NIC home. From its inception until 1963, the conference had been divided into East and West divisions. The West Division left to form the Northwestern Conference in 1963. With membership dwindling to 7 members by the 1970s, the conference added former members of the Northern Indiana Valley Conference to its ranks. Currently, every former NIVC member is now a part of the NIC except for South Bend Jackson, which closed in 1973, and South Bend LaSalle, which joined the NIC in 1977, but closed in 2001.
The Duneland Athletic Conference (DAC) is a high school athletic conference in Indiana serving eight members of the Indiana High School Athletic Association. Member schools are located in the counties of Lake, LaPorte, and Porter along Indiana's Lake Michigan shore. Each school is classified based on enrollment as 6A or 5A for football and 4A for basketball, the classes for the largest schools in Indiana. The Duneland Conference is also known for its gymnastics programs which have won a combined total of 35 state championship and state runner-up titles.
The Northern Lakes Conference of Indiana (NLC) is an IHSAA-sanctioned athletic conference of high schools located within Elkhart, Kosciusko, Marshall and St. Joseph counties in northern Indiana, United States.
The Eastern Indiana Athletic Conference (EIAC) is a distinguished, eight-member IHSAA-sanctioned high school athletic conference. Current members consist of Batesville, Connersville, East Central, Franklin County, Greensburg, Lawrenceburg, Rushville, and South Dearborn. All eight member schools are located in rural southeast Indiana, spread across Dearborn, Decatur, Fayette, Franklin, Ripley, and Rush counties. The EIAC was founded in 1956 when Brookville, Cambridge City, and Hagerstown of the East Central Conference joined with Aurora, Batesville, and Lawrenceburg of the Southeastern Indiana Conference. Batesville and Lawrenceburg are the only two of the original six founding schools that haven't consolidated or left the conference. North Dearborn joined the conference in 1962, which eventually consolidated into East Central in 1973. In 1974, Greensburg parted ways with the South Central Conference to join the EIAC. Aurora consolidated into South Dearborn in 1978 and Brookville consolidated into Franklin County in 1989. With the exception of 1962-66, 1973-74, 1977-85, and 1974-77, the conference had been a six-member league until 2013 when Connersville and Rushville joined.
The Greater South Shore Conference is a nine-member Indiana High School Athletic Association athletic conference spanning Lake and Porter counties in Northwest Indiana. Two other members, Boone Grove and South Central, participate only in football, otherwise participating in the Porter County Conference.
The North Central Conference is an IHSAA-sanctioned athletic conference consisting of ten large high schools in Cass, Delaware, Grant, Howard, Madison, Marion, Tippecanoe, and Wayne Counties across Central and North Central Indiana. Most of these schools are in 35,000+ population towns like Anderson, Marion, Kokomo, Lafayette, Muncie, and Richmond. Several of the nation's largest gymnasiums belong to members of this conference.
The Northwest Crossroads Conference is a seven-member IHSAA-sanctioned athletic conference. Six of the seven institutions are in Lake County, while the sixth, Kankakee Valley, is in neighboring Jasper County. This conference was created in 2007, following the disbandment of the Lake Athletic Conference. Griffith left the conference after the 2016–17 school year to join the Greater South Shore Athletic Conference (IHSAA).
The Western Indiana Conference is the name of two IHSAA-sanctioned conferences based in West Central Indiana. The first formed as an eight-team league that formed as a basketball league in 1944 as the West Central Conference. The league started expanding in 1945 and changed its name to the Western Indiana Conference. With consolidation forcing many membership changes in the 1970s, the conference folded at four members in 1983.
Hammond High School was a public secondary school located in the Northwestern Indiana city of Hammond. Part of the School City of Hammond district, it opened in 1884 and graduated its final class in the spring of 2021.
The Lakes Conference is a high school athletic conference whose members are located in mid-sized cities in northwest Iowa. Most of the schools are located in their respective county seats.
The Missouri River Activities Conference is a high school athletic and activities conference whose members are located in either the Sioux City Metropolitan Area or the Omaha-Council Bluffs Metropolitan Area, both located along the Missouri River on the border of western Iowa.
Shelbyville Senior High School is a public high school located in Shelbyville, Indiana, United States. It is managed by Shelbyville Central Schools.
Clark High School was a public secondary school located in Whiting, Indiana. Clark served students in grades 6–12 in the School City of Hammond. Following the 2020–2021 school year, the school closed due to the consolidation of Hammond schools.
South Adams Junior-Senior High School is a public high school located in Berne, Indiana, United States.
The Western Boone Junior-Senior High School, colloquially called WeBo, is a public high school located in Thorntown, Indiana.
Frankfort Senior High School is a public secondary school in Frankfort, Indiana, United States. It serves grades 9-12 for the Community Schools of Frankfort.