Usps Postage Rates 2024 Chart 2024. Effective september 16th, usps will adjust rates for priority mail and ground advantage. This means certain shipping and mailing costs will increase for.

Impacted zip codes will enjoy up to 41.66% off usps priority mail® and 48.92% off usps ground advantage™ when you ship through stamps.com. Here’s a list of the rate increases this.