Any local group with five or more students who are taking or who have taken a classical language or a course in the classical humanities and with assistance of a teacher or sponsor may form a chapter. Detailed information, including a chapter registration form, are available on-line or from the NJCL Office.

In the event there is no local chapter, individual members may also apply for member-at-large status with the National Junior Classical League via the Member-at-Large registration form. Such members must also apply for membership with their state or provincial organization, if one exists.