Tracking numbers for USPS typically look like a 22-digit number, starting with “94” and ending with “US.” For example, 9400110200883286341234US. These numbers are used to track the status and location of packages as they are being shipped through the USPS system. 1. What do tracking numbers for USPS look like? – Tracking numbers for USPS… Continue reading what do tracking numbers for usps look like?