Federal prosecutors say Allen pleaded guilty to two counts of mail theft. She faces up to five years in prison and a $250,000 fine.
The investigation was triggered by complaints of parcels on Allen's route not delivered, even thought they were electronically scanned on arrival at the post office.
Prosecutors say undelivered items were found in her home and personal vehicle.
Allen pleaded guilty Wednesday.
She resigned in April, after four years with the U.S. Postal Service.
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