This article is from the Puzzles FAQ, by Chris Cole email@example.com and Matthew Daly firstname.lastname@example.org with numerous contributions by others.
What organizations exist for puzzle lovers?
American Cryptogram Association
18789 West Hickory St.
Mundelein, IL 60060
Devoted to cryptography. Every issue of the journal contains
several thoughtful articles and a large number of puzzles, including
aristocrats, patristocrats, xenocrypts, cipher exchanges and
cryptarithms. Members have the option of picking a "nom" (nom de
plume), e.g. the president is Gizmo. As it is a specialized
organization, you should request a sample issue first (I don't
know the procedure for this, but $1 and a SASE should do it).
The National Puzzlers' League
Judith E. Bagai
Portland, OR 97282
Simply the best organization devoted to word puzzles. The _Enigma_
contains over 80 word puzzles per issue, ranging in difficulty from
easy to extremely difficult and in type from the familiar anagrams
and riddles to such obscure forms as spoonergrams and acrostical
enigmas. Each issue also includes a member-written cryptic. Members
get to pick a "nom" (nom de plume), e.g. I'm Cubist and Chris Cole
is Canon. The NPL is a somewhat specialized organization, so you
should send a SASE with a request for a mini-sample to the editor
to see if it's for you.