File talk:Flag of San Diego County, California.png

History of the San Diego County Flag
This is from a PDF file on the county web site.
 * On February 18, 1957, the Board of Supervisors adopted an official flag for the County of San Diego (as shown on the left).
 * The flag features the County seal on a field of white, bordered at the top by a band of red, and at the bottom by a band of green, significant of the territory of San Diego County having been under the control of King Charles of Spain, the Republic of Mexico, the Republic of California, and the United States of America.
 * The County flag was designed by Mrs. Estelle Secor, a former County employee in the Road Department. In 1956, a committee composed of Mr. John Davidson, County Purchasing Agent Mr. Verne Gehringer, and Director of Parks and Recreation Mr. Cletus Gardner, conducted a study for the design of an official flag for the County. Mr. Gardner wrote in a memo to the Board on February 14, 1957 that “One of the original reasons for this [sic] designing was to have an official County flag hanging in the Board Chambers.” The Board formally adopted a drawing of the flag on February 18, 1957. Mrs. Secor presented the completed, hand-sewn flag to the Board of Supervisors on September 10, 1957.
 * Later in 1962, the Board directed that the hand-fabricated official flag of the County by Mrs. Secor, be thoroughly cleaned and permanently enclosed in a glass case in the Board Chamber. The original County flag is still on display in the Board Chamber, Room 310 at the County Administration Center, 1600 Pacific Highway, San Diego, California 92101.
 * The United States flag, State of California flag, and County flag are all displayed at most County facilities.