1885–1918: The Municipal Borough of Harwich, and parts of the Sessional Divisions of Lexden and Winstree. Non-resident freeholders of the Parliamentary Borough of Colchester, which constituted the Municipal Borough thereof, were also entitled to vote. Formally known as the North Eastern or Harwich Division of Essex, incorporating the abolished Parliamentary Borough of Harwich and extending southwards and westwards to include the towns of Clacton and Brightlingsea and the rural areas surrounding Colchester. 1918–1950: The Municipal Borough of Harwich, the Urban Districts of Brightlingsea, Clacton, Frinton-on-Sea, Walton-on-the-Naze, and Wivenhoe, and the Rural District of Tendring. Western, rural parts included in the new Colchester Division of Essex. 1950–1983: The Municipal Borough of Harwich, the Urban Districts of Brightlingsea, Clacton, Frinton and Walton, and Wivenhoe, and the Rural District of Tendring. No changes. 1983–1997: The District of Tendring wards of Beaumont and Thorpe, Bockings Elm, Bradfield Wrabness and Wix, Frinton, Golf Green, Great and Little Oakley, Harwich East, Harwich East Central, Harwich West, Harwich West Central, Haven, Holland and Kirby, Little Clacton, Ramsey, Rush Green, Southcliff, St Bartholomew's, St James, St John's, St Mary's, St Osyth, Tendring and Weeley, and Walton. Western parts, including Brightlingsea and Wivenhoe, included in the new County Constituency of North Colchester. 1997–2010: The District of Tendring wards of Beaumont and Thorpe, Bockings Elm, Frinton, Golf Green, Great and Little Oakley, Harwich East, Harwich East Central, Harwich West, Harwich West Central, Haven, Holland and Kirby, Little Clacton, Ramsey, Rush Green, St Bartholomew's, St James, St John's, St Mary's, Southcliff, and Walton. A further western slice, including St Osyth, added to the new County Constituency of North Essex. Following the Boundary Commission's Fifth Periodic Review of Westminster constituencies, Parliament radically altered some constituencies and created new ones to allow for changes in population. Consequently, the constituency of Harwich was abolished. The majority of the constituency, including Clacton, Frinton and Walton, formed the new County Constituency of Clacton, and Harwich and surrounding areas were included in the new County Constituency of Harwich and North Essex.
Attwood's election was declared void on petition due to bribery by his agents, causing a by-election.
Elections in the 1850s
Hobhouse was elevated to the peerage, becoming 1st Baron Broughton and causing a by-election. Prinsep's election was declared void on petition due to bribery, due to, causing a by-election. Crawford's election was declared void, due to polling being closed prematurely, and the seat's writ was suspended in July 1851. A by-election was called the next year. Kelly resigned to contest a by-election in East Suffolk, causing a by-election. Peacocke's election was declared void on petition, due to corrupt practices, causing a by-election. Warburton's death caused a by-election. Bagshaw's resignation caused a by-election.
Elections in the 1860s
Campbell succeeded to the peerage, becoming Lord Stratheden and Campbell, and causing a by-election. Seat reduced to one member
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;
