Jerry Muma's letter to the Rotary Club of Chicago, dated October, 1910, states that thirty-one (31) men attended the organization meeting and thirty (30) of the thirty-one (31) became charter members of the Club. No information has as yet been found that would tell who these (30) men were.

The historical files of the club contain a roster marked No. 4, carrying no date, and not listing any of the officers. It contains a list of 103 members. This roster appears to have been printed about July or August, 1909. There is also a roster marked No. 5, carrying no date and no list of officers. It lists 142 in the membership. It is estimated that this roster was printed in September, 1909.

Both of the above rosters were printed by the Curran Printing Company at 211 New High Street, which, according to some of the earlier members, was succeeded by the House of Ralston. The Los Angeles Improvement Association News in an issue of October, 1909, lists 140 names as the roster of the club at that time. This list is headed by Honorable George Alexander, Mayor, and contains other names of many other men who were prominent at that time including L. H. Schwaebe, former Collector of Customs for Los Angeles Harbor, and Frank Wiggins, former Secretary-Manager of the Los Angeles Chamber of Commerce.