At the beginning of 1974 there were still three BSA councils that did not have Order of the Arrow. Long Beach Area Council, Long Beach, California had the Tribe of Tahquitz. Pony Express Council, of St. Joseph, Missouri, and the Kansas City Area Council, Kansas City, Missouri ran Mic-O-Say instead of Order of the Arrow.

In early 1974 Kaw Council, Kansas City, Kansas merged with Kansas City Area Council and formed Heart of America Council. When they did, the already existing Tamegonit Lodge from Kaw Council spread OA throughout the new council. Heart of America has continued to maintain Mic-O-Say.

After nearly 60 years, the OA had expanded into roughly 99.5% of BSA councils. Most holdouts to embracing the OA during the 1960s and 1970s either had Scout Executives that did not want OA or were fiercely loyal to local Non-OA honor societies. Long Beach Area Council chartered its first OA lodge in 2012.  Pony Express Council remains the only BSA council without OA,  based on their allegiance to a local non-OA honor society.