The Post Mark Collectors Club is a non-profit philatelic organization based in the United States, with members worldwide. The group maintains the most thorough post office listings in the country—our celebrated Directory; a Museum featuring two million philatelic and postal history items; our award-winning publication, the Bulletin; and an annual full-out four-day philatelic Convention. We hope you'll join us!

All of our work is done by enthusiastic volunteer members. The club is a non-profit affiliate of the American Philatelic Society.

New: Indiana Post Office Directory! → New postal listings are available for the U.S. Navy and the Coast Guard as well! Our celebrated Directory listings make the ultimate postal reference: information regarding all active Post Offices, stations, branches, CPUs, and more. Available for all 50 states. Learn more!

→ The PMCC is on Facebook! Follow us by 'liking' the page at the link above.

A Glossary of Postal Unit Terminology Yes, there is a difference between CPU and CPO! You can discover the meaning behind the terms station and branch with this illustrated glossary, as well.

PMCC on the BBC Member Evan Kalish explains the joy of postmarks The BBC broadcast a segment with Evan Kalish about visiting post offices and collecting postmarks ... worldwide! (Australian Broadcasting aired a story, too!)