The Kingdom is the largest groups within the SCA. To become a Kingdom a group must have a history of high level activity, at least 400 subscribing members and sufficient representative from all three peerages. It is ruled by a King and a Queen
A Principality is a subgroup of a Kingdom. It must have at least 100 subscribing members. It is ruled by a Prince and Princess, and is subject to Kingdom law. A group which wishes to become a Principality but does not yet fit one or more of the criteria, may become a Crown Principality.
A Canton is the subgroup of a Barony with at least five subscribing members.
A Riding is the subgroup of a Province with at least five subscribing members.
A Shire is a group with at least five subscribing members which reports directly to a Kingdom or Principality rather than a Barony.