Bassetlaw is the northernmost district of Nottinghamshire, England, with a population according to the 2001 UK census of 107,713. The borough is predominantly rural, with two towns: Worksop, site of the borough offices, and Retford. The district was formed on 1 April 1974 by the merger of the boroughs of Worksop and East Retford and most of Worksop Rural District and most of East Retford Rural District. It is named after the historic Bassetlaw wapentake of Nottinghamshire.