Postal Service: Postage Charges in Two Geographic Areas Were Accurate Most of the Time

In response to a congressional request, GAO conducted a statistical survey of the Washington, D.C., and the Cincinnati/Dayton, Ohio area to determine the U.S. Postal Service's (USPS) error rate in computing postage on individual letters and parcels that were weighed, specifically: (1) the nature and extent of postage errors; and (2) whether scale maintenance procedures affected the accuracy of postage paid.