1885–1918

• The Sessional Divisions of Houghton-le-Spring, Sunderland and Seaham Harbour (part); and
• The Municipal Borough of Sunderland^[2]

NB included only non-resident freeholders in the parliamentary borough of Sunderland.

See map on Vision of Britain website.^[3]

1918–1950

• The Urban District of Houghton-le-Spring;
• the Rural Districts of South Shields and Sunderland; and
• part of the Rural District of Houghton-le-Spring.^[4]

Rural/coastal areas between South Shields and Sunderland, including the Boldons, transferred from Jarrow.  Lost Hetton-le-Hole to the new Durham Division of County Durham and Seaham to the new Seaham Division.

1950–1955

• The Urban Districts of Houghton-le-Spring and Seaham; and
• the Rural District of Sunderland.^[5]

Seaham (including Seaham Harbour) transferred back from the abolished Seaham Division. Lost areas to the Borough Constituencies of South Shields, Sunderland North and Sunderland South as a result of the expansion of the respective County Boroughs. Remaining northern areas, largely comprising the Urban District of Boldon (which had largely succeeded the abolished Rural District of South Shields), transferred to Jarrow.

1955–1974

• The Urban Districts of Houghton-le-Spring and Seaham; and
• the Rural District of Sunderland except the parts of the parishes of Ford, Herrington, Hylton, and Silksworth added to the County Borough of Sunderland by the Sunderland Extension Act 1950.^[5]

1974–1983

• The Urban Districts of Hetton, Houghton-le-Spring, and Seaham; and
• in the Rural District of Easington, the parishes of Burdon, Cold Hesledon, Dalton-le-Dale, East Murton, Seaton with Slingley, and Warden Law.^[6]

The Urban District of Hetton transferred back from Durham and northern parts of the Rural District of Easington, including East Murton, transferred from Easington. Parts comprising the former Rural District of Sunderland, which had been largely absorbed by the County Borough, were transferred to Sunderland North (Hylton) and Sunderland South (Ryhope and Silksworth).