Women in the USPS

DEC 7 1974, DEC 20 1974, DEC 22 1974 Debbie Singer Sorts Mail on Her Job With The U.S. Postal Service In Denver She said women often are forced to suffer economically by being shut out of certain job classifications. Credit: Denver Post

Women have been part of mail delivery in the U.S. since colonial times, but it took centuries for women postal workers to become commonplace. Even through times when certain USPS jobs were off limits to them, women were still vital to the postal service.

Debbie Singer sorts mail on the job with the U.S. Postal Service in Denver, Colorado, in 1974. (Photo By Dave Buresh/The Denver Post via Getty Images)