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Postal clerks are employees of the United States Postal Service (USPS). The equivalent employees at package delivery companies have different titles but perform many of the same duties; at Federal Express they are called service agents, at United Parcel Service, administrative assistants and account executives. Their job duties may be diversified, depending upon the size of the post office or company at which they are employed. Among their duties are working at the public service windows in post offices, answering telephone inquiries, handling packages, and sorting incoming and outgoing mail. About 75,800 postal clerks work for the United States Postal Service.