All of Sister Cities International’s members are independent organizations and have a number of management structures. Sister city organizations are run by a group of volunteers, representatives from local institutions, the mayor’s office or municipal government, or by some combination of these. Most often sister city organizations are incorporated as 501(c)(3) nonprofits, although the municipal government may have representation or a formal relationship with the group. Many are governed by a board of directors or commission. Organizations are most often organized by committee. Some sister city organizations are run by local institutions, such as a museum, cultural center, or chamber of commerce. Most municipal contacts for sister city organizations are in the office of the mayor, office of tourism/convention and visitors bureau, office of international affairs, office of protocol, or office of economic development.