What is the minimum number of pieces required for a presorted First-Class mailing?

For presorted First-Class mail, the requirement is a minimum of 500 pieces. This threshold is established to ensure that bulk mailings are cost-effective and efficient for both the sender and the postal service. By requiring a larger quantity of pieces, the postal service can streamline processing and delivery, resulting in lower rates that benefit those who are sending out a significant volume of mail.

This also promotes the idea of bulk mailing as a viable option for businesses looking to reach a wider audience while managing their mailing costs. Smaller mailings may not take advantage of the economies of scale that come with larger distributions, which is why the 500-piece minimum is in place.