Usps Postage Rates 2024 Chart 2024. Explore the usps postage rate shifts for postcards, flats, and letter sizes in 2024, and optimize your mailing strategies accordingly to save costs. Effective september 16th, usps is adjusting rates for priority mail® and ground advantage®.

The changes will raise mailing services product prices approximately 7.8 percent. Effective september 16th, the usps is implementing rate adjustments for priority mail and ground advantage packages shipped to specific zip codes.