Born in Los Angeles, she left the University of California at Los Angeles to study at the vocational school on. Then she became secretary of MGM production.
In 1947 she moved to New York to go on stage. She appeared twice in 1950 Brodwaytheater: as Eunice Hubbell in a revival of A Streetcar Named Desire and in the Cole Porter musical Out of This World. She interrupted for some time her acting career to work as a production secretary at Gunsmoke and other TV shows in Los Angeles. Peggy Rea's comeback took place in 1962. Among her film credits include The mysterious Dr. Lao ( 1964) and Back from Hell (1989).
Became famous for Peggy Rea mainly by small but distinctive roles in series such as The Waltons, The Dukes of Hazzard, 3 Charlie's Angels and a strong family. Furthermore, Rea was on display until the end of the 1990s also in supporting roles in several theater productions, including Made in America and Love Field - love without limits. She also played the role of Rose Burton, the cousin of Olivia Walton in the television series The Waltons.
Peggy Rea died on February 5, 2011 in her home of heart failure.