Now encompassing solely the public high schools in Cincinnati, the league lasted until 1985, when reshuffling of city and suburban Cincinnati high schools took place, which led to the formation of the Cincinnati Hills League, Eastern Metro Conference, Metro County Conference, and Western Metro Conference.
Blanchester was not included in the 1959–60 standings, due to growing to a AA-sized school by annexing Jefferson, but were allowed back into league play the following season.
Blanchester and Clinton-Massie would concurrently play in the CCL and Fort Ancient Valley Conference for the 1964–65 school year, after which the other two CCL schools consolidated into East Clinton, who would join the FAVC nine years later.
The Greater Miami Valley Conference began operation during the 1982–83 school year but folded at the conclusion of the 2000–01 school year when the league merged with the Western Ohio League, forming the Greater Western Ohio Conference.
The initial GMVC was formed with six schools from the Miami Central Conference - Vandalia-Butler, Northmont, Piqua, Sidney, Trotwood-Madison, and Tecumseh.
The HCL operated in an East-West divisional format until 1969, when it went to American and National divisions.
The table below shows the alignment the final school year of 1984-85 before the breakup of the league.
Vandalia-Butler, Northmont, Piqua, Sidney, Trotwood-Madison, and Tecumseh withdrew from the MCC to form the Greater Miami Valley Conference (GMVC) with Greenville from the Southwestern Buckeye League and Troy from the Western Ohio League.
In 2019 the league resumed competition after 10 teams left the Greater Western Ohio Conference.
Little Miami returned to the WCL and was replaced by Lakota in 1959, prompting a rebrand to become the Southwestern Ohio Conference.
It survived intact with a three division alignment until 1999, when seven members left for the Fort Ancient Valley Conference.
It lasted until 2001, when most of the schools split into the Northwest Central and Ohio Heritage conferences.