Amateur
- 403
- Central Texas Astronomical Society
- Calendar, observatory, news and events, FAQ, Hands on Universe Programs, and links located in Waco.
- 405
- North Houston Astronomy Club
- Provides information about the club, including events and star parties, a list of members and astronomy news.
- 407
- The Barnard-Seyfert Astronomical Society
- Archive, newsletter archive, events, organization, programs, and links located in Nashville.
- 408
- The Smoky Mountain Astronomical Society
- How-to articles, library catalog, star party information, newsletter, tonight's sky, and gallery located in Knoxville.
- 409
- Midlands Astronomy Club
- Calendar, gallery, telescope advice, observing session, etiquette, and the sky and ISS above located in Columbia.
- 410
- Amateur Astronomers Association of Pittsburgh
- Calendar, facilities, features, guides, and light pollution.
- 412
- Berks County Amateur Astronomical Society
- Calendar, library, events, and newsletter located at Wyomissing.
- 413
- Bucks-Mont Astronomical Association
- Picture archive, calendar of events, club event calendar, observation reports, message board, and activities located in Chalfont.
- 414
- Central Pennsylvania Observers
- Skywatch, meetings, resources, calendar, and links located in State College.
- 415
- Chester County Astronomical Society
- Astrophotography, calendar, library, maps, and newsletter archive.
- 417
- Starlight Astronomy Club
- Observation information, schedule, events, and new observer information located at Hollidaysburg.
- 418
- The Astronomical Society of Harrisburg, PA
- Classes, events, public speaking and observing, information, gallery, star party information, resources, and forum.