Early records show J.O. Bumpas as the President of the Oklahoma City Manager's Association in 1949-50. Other early President's included:
- Frank Winstead, 1950-51
- Leon Carver, 1951
- Gerald D. Wilkins, 1951-52
- John Davidson, 1952-53
- W.B. Moran, 1953-54
- E.E. Jones, 1954-55
- Roy Adair, 1955-56
- Harry Macrory, 1956-57
- J.B. Marshall, 1957-58
- John Hammond (Resigned), 1958-59
- Ed Ash, 1958-59
The original CMAO Constitution and By-Laws were created in January 1976.
January 17, 1992
CMAO amended the by-laws to remove the board requirement that board members also be ICMA members.
January 28, 1993
CMAO amended the by-laws by changing the budget year to run in accordance with the physical year.
January 12, 1996
The by-law were amended to establish the seven districts.
July 10, 1998
CMAO membership approved a recommendation by the Nominating Committee which would require each board member to move up a position each year.
July 19, 2002
CMAO membership amended the "Ethics" section of the Constitution.
July 15, 2011
CMAO membership amended the (January 8, 2009) by-laws to change the composition of the Board adding two at-large positions and a representative for each of the seven districts.
July 17, 2015
CMAO membership amended the Constitution to clarify membership categories and membership procedures. Also, amended Article IX - Annual Budget; Section 4 wording which specifies annual budget recommendations.
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