- Mobley suffered from the painful condition Crohn's Disease and was an advocate for research and fund-raising for the disease. She also took a particular interest in world hunger and children with learning disabilities, and was an active participant with the March of Dimes for more than a quarter century.
- Miss Mississippi 1958 and Miss America 1959.
- Born in Biloxi, Mary Ann was voted into the University of Mississippi Hall of Fame along with fellow Mississipian William Faulkner. Mary Ann was the first woman to be so honored.
- During the 1959 'Miss America' contest, Mary Ann sang, for the talent portion, a highly formal, operatic rendition of Puccini's "Un Bel Di" that segued into a belt version of "There'll Be Some Changes Made" as she stripped down into something skimpier. She won the crown.
- Mary Ann was originally cast as The Girl from U.N.C.L.E. (1966), but was ultimately replaced by Stefanie Powers.
- She was cast as the original Batgirl on Batman (1966) but was replaced by Yvonne Craig.
- Started off her television career as a singing regular on variety shows. She later performed a number of musical roles in summer stock, including "Brigadoon", "Guys and Dolls", "Hello, Dolly!" and "The King and I".
- Described herself as an "avid" scuba diver.
- Mobley's daughter is Clancy Collins White, a Senior Vice President with MGM Television. Mobley was mother-in-law of Dean White and stepmother of Guy Collins and Mimi Collins.
- Received the Women's International Center (WIC) Living Legacy Award in 1987.
- Appeared on Card Sharks as a celebrity guest player in 1979.
- She was considered to be a panelist for the updated version of The Match Game (1962) in 1998, but turned down the offer due to illness.
- Has a half-sister.
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