Boulder Astronomy and Space Society
- Events, links, and gallery.
- http://www.boulderastro.org

Sangre Stargazers Astronomy Club
- Upcoming and past events, and roster located at Westcliffe.
- http://sangrestargazers.skymtn.com/

Black Canyon Astronomical Society
- Mission, officers, calendar of events, and gallery located at Montrose.
- http://home.ix.netcom.com/~bcas/

Arkansas Valley Astronomical Society
- News, articles, and store for Buena Vista, Salida, Leadville and the surrounding areas.
- http://www.fourteenernet.com/avas/

Northern Colorado Astronomical Society
- Items of local interest, gallery, current events, imaging and telescope optics care, and older topics located at Fort Collins.
- http://ncastro.org/

Longmont Astronomical Society
- Star parties, club news, gallery, and links.
- http://longmontastro.org/

Denver Astronomical Society
- Bookstore, listserve, e-board, meetings and maps, newsletter, gallery, star parties, and archives.
- http://www.denverastrosociety.org

Colorado Springs Astronomical Society
- What's new, Earth Orbiting Satellite Observers Club program, newsletter, gallery, and bookstore.
- http://www.csastro.org/