In Alcoholics Anonymous, there are no facilities officially known as clubhouses or centers. There are, however, unofficial gathering places (often informally called club houses), open to anyone who claims membership in AA, and their function is essentially to be a gathering place at times that don’t coincide with regular group meeting times.
AA is represented and serviced by an entity called the General Services Office; essentially the warehouse of materials and data for AA worldwide. Within all the states and about 180 countries of the world, there are AA Districts that cluster individual AA groups for accounting and representation.
The individual ‘Group’ is the most important part of AA (the grass roots of the program, really) and consists of memberships of varying sizes that have come into being as a result of the willingness of the members to join.
A Central Office (perhaps the ‘center’ to which you refer) is the hub for groups within a district, the primary function of which is to be a referral guide for newcomers finding a group to join, as well as providing literature and other materials necessary for Group day to day functioning. Please refer to the site here for further info:
http://www.aa.org/
I do hope this is of help to you.