The Maryland Ornithological Society is a statewide organization of local chapters. Each local chapter establishes it own dues structure, and a portion of those dues goes to the state Society. At-large membership (no local chapter affiliation) is also available.

The MOS membership year begins September 1. Dues should be mailed to the chapter of your choice or to the at-large membership chairperson. Check the chapter listings for the dues required to join a particular chapter and the name and address of a membership contact. Provide the following information:

Name
Address
Phone (work)
Phone (home)
Dues Category (Individual, Household or Junior)
Amount Enclosed