| Hornsey (1885 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 2) Middlesex, Hornsey |
| Houghton-le-Spring (1885 - 1983) |
Full name (in Craig 2,3,4) Durham, Houghton-le-Spring |
| Howdenshire (1885 - 1950) |
Full name (in Craig 2,3) Yorkshire (East Riding), Howdenshire |
| Hyde (1885 - 1918) |
Full name (in Craig 2) Cheshire, Hyde |
| Ilkeston (1885 - 1983) |
Full name (in Craig 2,3,4) Derbyshire, Ilkeston |
| Ince (1885 - 1983) |
Full name (in Craig 2,3,4) Lancashire, Ince |
| Isle of Thanet (1885 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 2,3,4) Kent, Isle of Thanet |
| Islington East (1885 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Islington North (1885) |
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| Islington South (1885 - 1950) |
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| Islington West (1885 - 1950) |
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| Jarrow (1885 - 2024) |
Full name (in Craig 2,3,4) Durham, Jarrow. Craig (4) 369 until 1955 revision |
| Keighley (1885 - 2024) |
Full name (in Craig 2,3) Yorkshire (West Riding), Keighley |
| Kensington North (1885 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Kensington South (1885 - 1974) |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Kerry East (1885 - 1922) |
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| Kerry North (1885 - 1922) |
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| Kerry South (1885 - 1922) |
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| Kerry West (1885 - 1922) |
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| Kildare North (1885 - 1922) |
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| Kildare South (1885 - 1922) |
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| Kilkenny North (1885 - 1922) |
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| Kilkenny South (1885 - 1922) |
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| King's County Birr (1885 - 1918) |
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| King's County Tullamore (1885 - 1918) |
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