Shipping and mailing requirements can vary for a wide variety of reasons. Before committing to a single approach, use the below links to help you with your research or contact us for some innovative solutions.


Maximum dimensions and thicknesses for postcards, letters, large envelopes, and packages.

International destination addresses must comply with the standards in this section.

Are you looking to grow your business through exporting? Assess your company’s readiness for entering your first markets, expanding into additional markets, or taking on more challenging, high-growth export markets.
Help your international delivery arrive on time! Learn about international address formats, size requirements, safety restrictions, & other tips on
A tariff or duty (the words are used interchangeably) is a tax levied by governments on the value including freight and insurance of imported products. Different tariffs are applied on different products by different countries.
The HTS Search functionality allows users to query the database to find information specific to certain goods or items found in the officially published HTS document.


Includes import documentation and other requirements for both the U.S. exporter and foreign importer.

Includes web links to local trade fair or show authorities and local newspapers, trade publications, radio/TV/cable information.

Country Conditions for Mailing — Canada
Rules for Canada address format use of the standard two–character abbreviation for provinces and territories.


If you have any questions about whether or not the contents of your shipment can be shipped by USPS®, consult the lists of prohibited and restricted items.

Did you know the shape of your mail determines the price you will pay?

Choosing a Service for Mailing:  Shape + Speed + Cost = Service

Find examples show how mailing services can be combined to meet your needs.

Current price lists for all mailing categories.

Application to Mail at Nonprofit USPS Marketing Mail Prices

Look Up a ZIP Code™ by Address, by City/State, or Cities by ZIP Code™


Use these guides for measuring packages.

This guide will explain your options for mailing and help you choose the services that are best for you.
DIM weight is determined by multiplying a package’s length, width, and height and applying a volumetric divisor.