- Ilford, Redbridge
- Ilfracombe, Devon
- Ilminster, Somerset
- Immingham, North East Lincolnshire
- Ince-in-Makerfield, Greater Manchester
- Ingatestone, Essex
- Innerleithen, Scottish Borders
- Innsworth, Goucestershire
- Inverbervie, Aberdeenshire
- Invergordon, Highland
- Inverkeithing, Fife
- Inverness, Highland
- Inverurie, Aberdeenshire
- Ipswich, Suffolk
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- Irchester, Northamptonshire
- Irlam, Greater Manchester
- Ironbridge, Shropshire
- Irthlingborough, Northamptonshire
- Irvine, North Ayrshire
- Irvinestown, Co. Fermanagh
- Isle Of Portland, Dorset
- Isle of Sheppey, Kent
- Isleworth, Hounslow
- Islington, Islington
- Iver, Buckinghamshire
- Iver Heath, Buckinghamshire
- Ivybridge, Devon
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