The Municipal Borough of Farnworth was a local government district centred on the town of Farnworth in the administrative county of Lancashire, England.In 1863, a Local board of health was established for the township of Farnworth, and in 1866, it also became a separate civil parish. In 1899, under the Local Government Act 1894, Farnworth became an urban district, and in 1939 it was granted by a charter to become a municipal borough.In 1974, the Municipal Borough of Farnworth was abolished by the Local Government Act 1972 and its former area was transferred to Greater Manchester to become an unparished area of the Metropolitan Borough of Bolton.Demography† The 1939 population is estimated from the National Registration Act figures. The 1941 census did not take place because of the Second World War.Neighbouring districtsThe Municipal Borough of Farnworth was surrounded to the north and west by the County Borough of Bolton, to the northeast by Little Lever Urban District, to the southeast by Kearsley Urban District, and to the south by Little Hulton Urban District.