The MIAA sponsors 16 conference championships (8 men's, 8 women's) in these sports: baseball, basketball, cross country, football, golf (men's), soccer (women's), softball, tennis, track and field (indoor and outdoor), and volleyball (women's). MIAA schools with additional sports (swimming and men's soccer) usually compete independently or as part of a nearby conference. The current staff consists of Bob Boerigter (Commissioner), Larry House (Assistant Commissioner for Championships and Business Development), Amber Feldman (Assistant Commissioner for Compliance and Internal Operations/Senior Woman Administrator) and Josh Slaughter (Director of Communications).
Nebraska–Omaha joined the conference on July 1, 2008. On July 3, 2007, Southwest Baptist University was granted independent status for their football team, while all remaining teams will stay in the MIAA.Lincoln University of Missouri (after revitalizing its dormant football program) was re-admitted to the MIAA by a vote of the CEO Council on January 30, 2009, and resumed membership in the 2010-11 academic year. On July 8, 2009, the MIAA CEO Council voted to remain a 12-team league for the foreseeable future, denying an application by Rockhurst University (which does not have a football team but wanted to compete in other sports). The vote ended short term speculation about the League expanding to 16 teams divided into two divisions. Southwest Baptist will rejoin the MIAA in football for the 2013 football season, which will mean the schools can then play an 11-game conference football schedule with no non-conference games. Currently, only schools in the Football Bowl Subdivision (formerly Division I-A) are allowed to schedule 12 regular-season games in all seasons. Football Championship Subdivision (formerly I-AA) schools are allowed to schedule 12 games in years that contain 14 Saturdays in the period starting with Labor Day weekend and ending with the Saturday before Thanksgiving; this will occur in 2013 and 2014.
In July 2010 it was reported that the conference was seeking to expand to 16 teams and is considering adding the four following schools: On July 30 the MIAA announced the University of Central Oklahoma and Northeastern State University would join after leaving the Lone Star Conference tentatively in the 2012-13 academic year. Lindenwood University submitted an application in May 2010 and after a few months of speculation, Nebraska-Kearney formally submitted an application to the MIAA on August 2, 2010. Both were formally approved and accepted on September 24, 2010. Once the expansion completes in 2012 the schools will only play each other in football and will play no non-conference games. The MIAA has opted not to divide into divisions in the 16-team arrangement. Teams that are closest geographically will play each other every year and will rotate through the other conference members in other years. The move to expand the league was spurred at least in part after Northwest Missouri during its national championship game run had problems finding non-conference teams that would play it resulting in 2010 with it having 10-game rather than 11-game schedule. The arrangement will end annual rivalries such as the Hickory Stick and Fall Classic at Arrowhead with the teams playing each other every other year or more. The following season after the expansion of the conference, on March 13, 2011, Nebraska–Omaha announced that they will be joining the Summit League and moving to Division I for the 2011-2012 season.
In June, 2012 Truman State University announced they had been accepted for membership in the Great Lakes Valley Conference effective Fall, 2013 and would be leaving the MIAA. Truman's departure leaves Central Missouri and Northwest Missouri State as the only founding MIAA members remaining in the conference.
When the conference was created it consisted of private and public schools. In 1924 it reorganized to include only public schools., and conference records tend to begin with that date. The schools left behind in the reorganization went on to later form the Missouri College Athletic Union, which would in time become the current Heart of America Athletic Conference in the NAIA.
Lincoln University was removed from the conference in 1999 because it did not have a football program since 1989. Lincoln has since revitalized its football program.
1912: The Missouri Intercollegiate Athletic Association (MIAA) was founded with 14 charter members: Cape Girardeau State Teachers College, Kirksville State Teachers College, Maryville State Teachers College, Springfield State Teachers College, Warrensburg State Teachers College, Central College, Central Wesleyan College, Culver-Stockton College, Drury University, Missouri Valley College, Missouri Wesleyan College, Tarkio College, Westminster College, and William Jewell College.
1918: Kirksville State Teachers College changes its name to Northeast Missouri State Teachers College.
1919: Cape Girardeau State Teachers College changes its name to Southeast Missouri State Teachers College. Maryville State Teachers College is renamed Northwest Missouri State Teachers College. Springfield State Teachers College is renamed Southwest Missouri State Teachers College. Warrensburg State Teachers College was renamed Central Missouri State Teachers College.
1924: The nine private members split off to form the Missouri College Athletic Union. The MIAA reorganizes to include only the five regional teachers' colleges—Central, Northwest, Northeast (Kirksville), Southwest and Southeast.
1935: Missouri School of Mines joins the MIAA as the sixth member.
1945: Southwest Missouri State Teachers College is renamed Southwest Missouri State College.
1946: Southeast Missouri State Teachers College changes its name to Southeast Missouri State College and Central Missouri State Teachers College became Central Missouri State College.
1949: Northwest Missouri State Teachers College changes its name to Northwest Missouri State College.
1957: The MIAA joins the NCAA College Division (forerunner of Division II).
1964: Missouri School of Mines changes its name to the University of Missouri at Rolla (now Missouri S&T).
1968: Northeast Missouri State Teachers College changes its name to Northeast Missouri State College.
1970: Lincoln University joins the MIAA, giving the league seven members.
1971: Central Missouri State College was renamed to Central Missouri State University.
1972: Northeast Missouri State College changes its name to Northeast Missouri State University. Northwest Missouri State College changes its name to Northwest Missouri State University. Southwest Missouri State College also changed its name to Southwest Missouri State University.
1973: Southeast Missouri State College changes its name to Southeast Missouri State University.
1980: The University of Missouri-St. Louis joins the MIAA as the eighth member from the Independent ranks.
1981: Southwest Missouri State (now Missouri State University as of 2005) leaves for NCAA Division I and the Association of Mid-Continent Universities, leaving the MIAA with seven members.
1986: Southwest Baptist University joins the MIAA as the eighth member.
1989: Missouri Southern State College, Missouri Western State College, Pittsburg State University and Washburn University join the MIAA from the NAIA Central States Intercollegiate Conference, giving the league 12 members.
1991: Southeast Missouri State leaves for NCAA Division I and the Ohio Valley Conference. Emporia State University joins the MIAA. Membership remains at 12 schools.
1992: The MIAA changes its name from the Missouri Intercollegiate Athletic Association to the Mid-America Intercollegiate Athletics Association
1996: Missouri-St. Louis leaves the MIAA for the Great Lakes Valley Conference, dropping membership to 11 schools. Northeast Missouri State changes its name to Truman State University.
1999: Lincoln leaves the MIAA due to not fielding a football team any longer for the Heartland Conference, dropping membership to 10 schools.
2003: Missouri Southern State College is renamed to Missouri Southern State University-Joplin.
2005: Missouri-Rolla leaves the MIAA for the Great Lakes Valley Conference. Total membership is now at nine schools. Missouri Southern State-Joplin drops Joplin from the name and is now known simply as Missouri Southern State University. Missouri Western State College also undergoes a name change to now be known as Missouri Western State University.
2006: Fort Hays State University joins the MIAA from the Rocky Mountain Athletic Conference (RMAC), bringing membership back to ten. Central Missouri State changes its name to the University of Central Missouri.
2008: The University of Nebraska at Omaha joins the MIAA as the 11th member from the disbanding North Central Conference.
2010: Lincoln University rejoins the MIAA from the Heartland Conference as the 12th member.
2011: Nebraska-Omaha leaves the MIAA to move to Division I and the Summit League, membership drops back to 11.
2012: The University of Central Oklahoma and Northeastern State University will leave the Lone Star Conference, Lindenwood University is moving up from the NAIA to NCAA Division II, and the University of Nebraska at Kearney is leaving the RMAC to join the MIAA to bring membership to its largest total in league history at 15.
2013: Truman State University leaves the MIAA to join the Great Lakes Valley Conference, dropping MIAA membership to 14.
From 1934 to 1995 the winner of the MIAA Tournament was declared the MIAA champion. From 1995 forward, the conference championship was determined by the leader in the points standing and a separate conference tournament was held.