Previously, a for-profit social club, not limited to singles. Non-profit singles events. They adhere to all Mountaineers rules and policies, and tend to attract the same sort of members that the parent club does. But if you are less than gung-ho about hiking, mountain climbing and so on, you may well find yourself being left behind. A fun bunch of people, if you can keep up with them.
Web site lists events as well as plenty of other info.
This is really a social rather than a singles club, but it does have some single members. This is primarily an organization for people who do not have children, for whatever reason. Kind of the opposite of a group for parents, this is specifically for non-parents. Events tend to be small and the group is very low-key. Publishes a tiny newsletter, listing events.