It returned one Member of Parliament (MP) to the House of Commons of the Parliament of the United Kingdom, elected by the first-past-the-post voting system.
1918–1950: The County Borough of Middlesbrough wards of Exchange, Grove Hill, Ormesby, St Hilda's, and Vulcan.
1950–1964: The County Borough of Middlesbrough except the wards of Acklam, Ayresome, and Linthorpe.
[1] 1964–1974: The County Borough of Middlesbrough wards of Berwick Hills, Cannon, Clairville, Exchange, Grove Hill, Newport, North Ormesby, St Hilda's, Thorntree, and Tollesby.
The political parties had been making preparations for an election to take place from 1939 and by the end of this year, the following candidates had been selected;