As of 2010, RBMS had approximately 1,800 members, making it the fourth largest ACRL section. Membership in RBMS is open to anyone who wishes to join, although memberships in both ALA and ACRL are required as prerequisites. A 1997 survey indicated that 96% of RBMS members are white and many are aging.[9] The section actively recruits both new members (as reflected in its conference scholarship program) and a more diverse population (as indicated in its diversity statement).