1885–1918: The Sessional Division of Spilsby, and parts of the Sessional Divisions of Alford and Horncastle.
1918–1950: The Urban Districts of Alford, Horncastle, Skegness, and Woodhall Spa, and the Rural Districts of Horncastle, Sibsey, and Spilsby.
1950–1983: The Urban Districts of Alford, Horncastle, Mablethorpe and Sutton, Skegness, and Woodhall Spa, and the Rural Districts of Horncastle and Spilsby.
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;