The Astronomical League
Composed of over two hundred and forty local amateur astronomical societies from all across the United States.
NexStar 50 Club
Shows data table of observed deep sky and planetary objects including moon features. Also includes list of members and reference works.
Sky Watch
Comprehensive list of all things astronomy. Find clubs, links, galleries, resources, books, and articles.
Urban Observing Club
Contains details about the policies, membership privileges, merchandise and forthcoming activities of the group.