Federal prosecutors in Waco say the two, identified as 39-year old Charles Hattenback and 28-year old Kathryn Hubbert of Temple, are accused of robbing post offices, collection boxes and parcel lockers in more than 80 Texas communities.
Those burglaries included post offices in Brenham, Burton, Chappell Hill and Old Washington.
Prosecutors say Hattenbach pleaded guilty Thursday to conspiracy to steal mail, bank fraud, theft of government property and three counts of aggravated identity theft.
Hubbert pleaded guilty to conspiracy to steal mail, bank fraud, theft of government property and two counts of aggravated identity theft.
Both await sentencing and face up to 50 years in prison.
Hattenbach and Hubbert since December stole credit cards, checks, money orders, postage, gift cards and other valuables. They reportedly stole over 50,000 pieces of mail.
According to U.S. Postal Service investigators, the couple was arrested in March in Temple after several weeks of surveillance.