Amateur
- 521
- Arkansas Oklahoma Astronomical Society
- Gallery, forum, downloads, FAQ, news, articles, tips, and education outreach located in Fort Smith.
- 522
- Central Arkansas Astronomical Society
- Club and astro news, minutes, technical tips, and forum located northwest of Little Rock at the River Ridge Observatory.
- 523
- Red River Astronomy Club
- Star party information, directions, photos, meeting information, and news located near Nashville.
- 524
- Saguaro Astronomy Club
- In Phoenix, provides meeting schedules, newsletters, FAQ, gallery, observing notes, and downloads.
- 525
- The Coconino Astronomical Society
- Meeting information, observing sessions, notes, news, minutes, and events located in Flagstaff.