The constituency was created as Devonport in 1832, and elected two members until 1918, when the number was reduced to one. Following the amalgamation of Devonport into Plymouth, the constituency was renamed as Plymouth, Devonport. Devonport has had a number of prominent MPs, including Leslie Hore-Belisha, Michael Foot, and the former SDP leader David Owen. One of its longest serving MPs was the National Liberal, later Conservative Dame Joan Vickers, who held the seat from 1955 until her defeat at the General Election of February 1974.
1918–1950: The County Borough of Plymouth wards of Ford, Keyham, Molesworth, Nelson, St Aubyn, and St Budeaux. 1950–1955: The County Borough of Plymouth wards of Ford, Keyham, Molesworth, Mount Edgecumbe, Nelson, Pennycross, St Aubyn, St Budeaux, St Peter, and Stoke; and the parish of Tamerton Foliot in the Rural District of Plympton St Mary. 1955–1974: The County Borough of Plymouth wards of Drake, Ernesettle, Ford, Molesworth, Nelson, St Andrew, St Aubyn, St Budeaux, St Peter, and Stoke. 1974–1983: The County Borough of Plymouth wards of Ernesettle, Ford, St Andrew, St Aubyn, St Budeaux, St Peter, and Stoke. 1983–1997: The City of Plymouth wards of Budshead, Estover, Ham, Honicknowle, Keyham, St Budeaux, and Southway. 1997–2010: The City of Plymouth wards of Budshead, Eggbuckland, Estover, Ham, Honicknowle, Keyham, St Budeaux, and Southway. From 1950 to 1983, the constituency included Plymouth city centre.
Seymour resigned, causing a by-election. Buller resigned in order to contest the 1865 Liskeard by-election. The election was declared void on petition, on account of bribery and corrupt practices, causing a by-election.
Elections in the 1870s
Elections in the 1880s
Elections in the 1890s
Elections in the 1900s
Elections in the 1910s
General Election 1914/15: Another General Election was required to take place before the end of 1915. The political parties had been making preparations for an election to take place and by the July 1914, the following candidates had been selected;
General Election 1939/40: Another General Election was required to take place before the end of 1940. 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;
Liberal National: Leslie Hore-Belisha
Labour: Michael Foot
Elections in the 1940s
Elections in the 1950s
Elections in the 1960s
Elections in the 1970s
Elections in the 1980s
This constituency underwent boundary changes between the 1979 and 1983 general elections and thus calculation of change in vote share is not meaningful.
Elections in the 1990s
This constituency underwent boundary changes between the 1992 and 1997 general elections and thus change in share of vote is based on a notional calculation.