us postal overnight tracking is a service provided by the United States Postal Service (USPS) that allows customers to track overnight shipments. Overnight delivery, often using USPS Priority Mail Express, guarantees fast delivery typically by the next business day. USPS offers tracking services for these shipments, providing real-time updates on the package’s location and expected delivery time. This service is ideal for businesses or individuals who need to send time-sensitive documents or packages quickly. By using USPS tracking, customers can ensure their overnight packages are handled promptly and efficiently.