The unitary authorities of Durham and Borough of Darlington are combined for the purpose of parliamentary constituency boundaries, being divided into 7 parliamentary constituencies– 1 borough constituency and 6 county constituencies. Since the 2019 general election, 4 parliamentary seats are controlled by the Conservative Party and 3 by the Labour Party. Between 1992 and 2019, all 7 seats were held by the Labour Party. With the exception of Darlington, all seats in the current ceremonial county or their predecessors had returned Labour MPs since 1935.