Membership in Sigma Chapter is by invitation. A member initiated becomes a member of Sigma Chapter, Eta State (the North Carolina Organization), and the International Society. Active members are women who are employed as professional educators at the time of their election or have retired from an educational position. An active member participates in the activities of the Society. Reserve membership is granted only to a member who is unable to participate fully in the activities of the Chapter because of physical disability and/or geographic location. Reserve status is granted by the Chapter, and a reserve member may be restored to active membership. An honorary member is a woman not eligible for active membership who has rendered notable service to education or to women and is elected to honorary membership in recognition of such service. As of the 2014-2016 biennium, Sigma Chapter has 79 active members, 3 reserve members, and  2 honorary members. This is a diverse group of educators from all levels of the public schools, independent schools, and the local college in the Kinston/Lenoir County area, which is organized as Region II of the state organization.