Coon resigned after less than two years in the state House to become mayor of Monroe upon the death at the age of thirty-seven of his predecessor, George Olan Breece (October 21, 1912 – November 6, 1949), a native of Kanawha, West Virginia.
After his mayoral tenure, Coon was from 1956 to 1964 the Louisiana state fire marshal under Governors Earl Kemp Long and Jimmie Davis.
His sister and last surviving sibling was Eunice Coon Williamson (1891–1991), an English and foreign languages faculty member from 1928 to 1958 at Louisiana Tech University in Ruston.
[5] Coon's first wife, the former Lera Whitten (1907–1980), was a 40-year teacher at Ouachita Parish High School; after her death, he wed the widowed Mattie Rose Ferguson Barnett Downs (1910-1998).
Coon was an honorary lifetime member of the Louisiana Firemen's Association and the International Chiefs of Police.