Founded in 1948, SWKROA has grown in membership to a present membership of over 2,600 members from nearly all 50 states. Members of the Association are owners of mineral interests and of royalty payable to them as oil and gas lessors. The stated purpose of the Association is "to foster, protect and further in all respects the rights and interests of the mineral owners" and promote the common business interests of such members. Funding comes only from membership dues and voluntary contributions to the Association.