The Territory of Swan is divided into 17 counties. The territory was first divided into five counties immediately after the cession of Swan from Carolina to the Empire in 1800. These were further subdivided to form seven additional counties by 1900. Another five were counties formed through further sub-division from 1900 to 1994. The most recent county formations in Swan were in 1994, when Cambridge County,
Victoria County and Vincent County were split from Perth County.