The United States Postal Service is conducting an Area Mail Processing (AMP) study for the Effingham Post Office.
The employees at the Effingham Post Office have been told that an AMP would involve sending all letters, flats and newspapers from the 624 area to the St. Louis facility to be processed. That means that your mail to the 618-619, 625-627, 628 and 629 ZIP codes would be dispatched from St. Louis.
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