Jones's first husband was an officer in the Merchant Marines. The couple had two sons (sons Denny [b. 1945] and Tim [b. 1947]). Her second husband was screenwriter Bill Davenport.
She was originally cast to play Becky Thatcher in The Adventures of Tom Sawyer (1938), but after a
growth spurt, the studio thought she was too tall for the role and
recast her as Mary Sawyer.
Interviewed in "Growing Up on the Set: Interviews with 39 Former Child Actors of Classic Film and Television" by Tom Goldrup and Jim Goldrup (McFarland, 2002).
The daughter of actress and persistent stage mother Freda Jones and sister of Margaret Jones, Marvin Jones, and Macon Jones. Marcia developed personal and emotional problems later in life, which triggered a severe alcohol problem. She later received a degree in religious science and conquered her dependency.