General

Organizations

The American Philatelic Society
The pre-eminent organization for US stamps. Extensive site with interesting news and an extensive range of services.

The United States Philatelic Classics Society
Devoted to the early US. The site is infrequently maintained but may be of some use.

The Carriers and Locals Society
The Society is dedicated to the study of carriers, locals and express posts, as well as the forgeries and reprints. Has an auction site included

The American Revenue Association
Dedicated to the fiscal philatelist. Not much information contained within, but it does give directions on how to apply for membership

American Stamp Club of Great Britain
Expanding site, with articles, a great guide to publications, links plus much more.

The Junior Philatelist
The best of the sites devoted to the younger collector.

American Stamp Dealers Association
A tacky site. It's main use is finding out where the next good show is.

The American Plate Number Single Society
APNSS is a volunteer-run association of stamp collectors organized to promote interest in plate number singles and other marginal markings.

The United States Stamp Society
a non-profit, volunteer-run association of collectors to promote the study of
the philatelic output of the Bureau of Engraving and Printing and of
postage and revenue stamped paper produced by others for use in the
United States and U.S. administered areas.