York County Astronomical Society
- Schedule, telescope clinic, public observing, observatory information, and news located at Jacobus.
- http://www.fotozz.com/ycas.htm

Starlight Astronomy Club
- Observation information, schedule, events, and new observer information located at Hollidaysburg.
- http://ehilbert.wso.net/Starlight/

Rittenhouse Astronomical Society
- Meetings, events, and items of interest located at Philadelphia.
- http://www.rittenhouseastronomicalsociety.org/

PennState Astronomy Club
- Meetings, history, events, equipment, and gallery located at University Park.
- http://www.clubs.psu.edu/up/astro/

Chesmont Astronomical Society
- Forums, newsletters, articles, and news located at Limerick.
- http://www.chesmontastro.org/

Astronomy Enthusiasts of Lancaster County
- Calendar, gallery, events, and resources.
- http://www.aelc.i8.com/

Amateur Astronomers Of Beaver County
- Club information, star party dates, and galleries.
- http://aaobc.com/

The Oil Region Astronomical Society
- Includes observatory information, education section, calendar, gallery, star party information located in Oil City.
- http://www.oras.org

The Delaware Valley Amateur Astronomers
- Events and meetings, public star parties, gallery, articles and observing tips, space news, and links located in Philadelphia.
- http://dvaa.org/php/page.php?body=Home

Chester County Astronomical Society
- Astrophotography, calendar, library, maps, and newsletter archive.
- http://www.ccas.us/

Central Pennsylvania Observers
- Skywatch, meetings, resources, calendar, and links located in State College.
- http://www.cpoclub.org

Bucks-Mont Astronomical Association
- Picture archive, calendar of events, club event calendar, observation reports, message board, and activities located in Chalfont.
- http://www.bma2.org

The Astronomical Society of Harrisburg, PA
- Classes, events, public speaking and observing, information, gallery, star party information, resources, and forum.
- http://www.astrohbg.org/

Amateur Astronomers Association of Pittsburgh
- Calendar, facilities, features, guides, and light pollution.
- http://3ap.org/