What actress played Loco Jones in TV's How To Marry A Millionaire from 1957-1959?

Answer:

Barbara Eden (who also played Jeannie in I Dream of Jeannie) played Loco Jones (52 episodes, 1957-1959)

How To Marry a Millionaire followed the exploits of three young ladies - Mike, Loco and Greta - as they tried to snare themselves three rich husbands. They could hardly afford to eat (and yet, in each episode, they wore more designer clothes, and managed to afford a penthouse apartment on the right side of the track.

Merry Anders played Mike McCall (52 episodes, 1957-1959)
Lori Nelson played Greta Hanson (39 episodes, 1957-1958)

It was the TV version of the 1953 movie, How To Marry a Millionaire, with

Betty Grable ... Loco Dempsey
Marilyn Monroe ... Pola Debevoise
Lauren Bacall ... Schatze Page