West Lothian, council area (1993 est. pop. 146,730), 164 sq mi (425 sq km), and former county, S central Scotland. Under the Local Government Act of 1973, West Lothian was divided between the Lothian and Central regions. In the local government reorganization of 1996, the Lothian and Central regions were dissolved and the council area of West Lothian was created in part from that portion of the county of West Lothian that had been assigned to the Lothian region. The county of West Lothian was formerly called Linlithgow or Linlithgowshire.