This report presents the results of our self-initiated audit of the Efficiency of Operations at the Milwaukee Processing and Distribution Center (P&DC) in Milwaukee, WI (Project Number 22-154). We conducted this audit to provide U.S. Postal Service management with timely information on operational risks at this P&DC. We judgmentally selected the Milwaukee P&DC based on a review of clearance times; workhours, mail volume, and productivity; overall scanning performance; late, extra and cancelled trips; overtime and penalty overtime; and trailer utilization. The Milwaukee P&DC is in the Westshores Division, processes letters and flats,1 and services multiple 3-digit ZIP Codes in urban and rural communities2 (see Table 1).