 From around the first quarter of the 18th century, until November 1900, the land to the south of the River Blyth was known as South Blyth. It was in the Parish of Earsdon and was run by the Parish Council until 1863, when the South Blyth Local Board was formed. Under the Local Government Act of 1894, South Blyth Local Board became an Urban District Council, then in 1906 it was amalgamated with Cowpen Urban District Council to form Blyth Urban District Council. On 21 September 1922, Blyth UDC became Blyth Municipal Borough Council, and in 1935 its southern boundary was moved south from Meggie's Burn to Seaton Burn. Blyth MBC lasted until 1974, when it was amalgamated with Seaton Valley and Cramlington Urban District Councils, as well as part of Whitley Bay Urban District Council, to form Blyth Valley Borough Council.
