2013 – Greeley
2004 – Gillette
2003 – Douglas County (Castle Rock, CO)
1997 – Fort Collins (rechartered)
1994 – Pikes Peak and Colorado Springs merged and became Pikes Peak
1994 – Southern Black Hills
1993 – Jefferson County
1987 – Spearfish
1986 – Denver II
1986 – 88 – Amey Grubbs, Fort Collins, Zonta International President
1985 – Pikes Peak
1985 – Zonta International Foundation incorporated as a 501 ( c) 3 organization
1984 – Purchase of Zonta Headquarters at 557 W. Randolph in Chicago
1982 – Aurora
1982 – Foothills of Boulder County
1981 – Loveland
1978 – Zonta International Convention held in Denver, 17,000 attended
1977 – Lakewood-Golden
1975 – Rock Springs
1973 – Canon City
1972 – Sturgis
1970 – 72 – Leota Pekrul, Denver, Zonta International President
1961 – Englewood-Littleton
1959 – Fort Collins
1959 – Deadwood-Lead
1956 – Cheyenne
1956 – Colby
1956 – 1974 – First International Service Project – Aid to Refugee in Women
1955 – Pierre-Ft. Pierre
1955 – Cody
1955 – Sterling
1955 – Goodland
1953 – Burlington
1953 – Glendive
1952 – The Eleven Clubs became District XII
1951 – Converse County (Douglas, WY)
1951 – Laramie
1951 – Boulder County
1950 – Black Hills
1950 – Sheridan
1950 – Billings
1949 – Prowers County (Lamar, CO)
1949 – Pueblo
1949 – Casper
1949 – Colorado Springs
1940 – 20th Annual Zonta International Convention hosted by Denver in Estes Park
1938 – Amelia Earhart Fellowships began
1933 – District E changed to District VII, with Minneapolis, Kansas City, St. Louis
1930 – Zonta International was incorporated
1928 – Headquarters moved to Chicago
1927 – Denver (in District E), along with Toronto
1925 – Districts were: A, B, C, D, E
1919 – Confederation of Zonta Clubs organized