In the fall of 1924, the Fifth National Convention at the University of Kentucky authorized publication of the Mortar Board Quarterly.

On February 27, 1937, Mortar Board was invited to become a member of the Association of College Honor Societies--the first organization composed entirely of women to receive this recognition.

The Mortar Board Foundation Fund was established at the 1955 Convention in order to further fund raising goals.

The Twenty-First National Conference held in June 1970 at the University of Nebraska established a National Office at Ohio State University in Columbus, Ohio. The Conference voted to invite student advisors to meet annually with the National Council and replaced the Quarterly with a newsletter, The Mortar Board Forum.

Delegates to the 1973 National Conference at Ohio State University retained membership for women only. The first Mortar  Board National Citation, instituted to honor women who made outstanding contributions to the status of women within- the society's ideals, was presented to Congresswoman Martha W. Griffiths of Michigan

A special conference was convened in October 1975 at Kansas City, Missouri, to consider the ramifications of Title IX  regulations, prohibiting sex discrimination within   organizations on campuses that are recipients of federal funds. Membership  was opened to male students and the purpose of Mortar Board was strengthened to include "to promote and advance the status of women".  The 1976 National Conference held at Colorado State University included men as voting delegates.

At the 1985 Conference in Columbus, Ohio, Mortar Board delegates passed a resolution to initiate a national project to be selected by each national conference, The delegates selected organ donor awareness as the first national project. Delegates also voted to hold National Conferences biennially.

In Indianapolis at the 1987 Conference, men were elected to the National Council for the first time and delegates voted to have an elected Student Representative at-Large added to the National Council. The National Project became part of the Bylaws.

By the 1991 National Conference in Atlanta, Georgia, the roll call grew to 200 chapters.

The 75th Anniversary of Mortar Board's founding was celebrated in July 1993 at the 30th National Conference held in Columbus, Ohio. Eight former National Presidents attended.