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Below you will find information on common postal specifications as well as the most updated rates.

ZIP Code Directory
To find a nine-digit zip code for your area
To find a city/state that goes with your zip code

Introduction to Business Mailing

USPS Direct Mail Manual

Postage Calculator

First Class Mail

Standard Mail (Bulk Rate)

Nonprofit Mail

Move Update Services
Move Update Standards
Address Change Services (ACS)

Reply Mail
Business Reply Mail Overview & Design
Courtesy Reply Mail Overview & Design

Postage Permits

Glossary of Mailing Terms

Neither nor Mailers Haven LLC nor the U.S. Postal Service is responsible for the accuracy of this information. For the most up-to-date information available, go to the U.S. Postal Service website at


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