Westminster Astronomical Society
- Newsletter, calendar, resources, gallery, and projects.
- http://www.westminsterastro.org/

Howard Astronomical League
- Meetings, calendar, star parties, observing information, documents, resources, and gallery located in Columbia.
- http://www.howardastro.org/

Baltimore Astronomical Society
- Meetings, speakers, and news.
- http://www.baltastro.org/

Southern Maryland Astronomical Society
- Events, the sky, observatory schedule, calendar, programs, news, and FAQ located in Marbury.
- http://www.smas.us

National Capital Astronomers
- Public meeting and lecture schedule, open telescope nights, telescope making and mirror grinding class, and exploring the sky program located in the Bethesda.
- http://capitalastronomers.org

Cumberland Astronomy Club
- Astrophotography gallery, meeting and star party information, special reports, and links.
- http://antoine.frostburg.edu/phys/luzader/cac/