- Ibsley, Hampshire@
- Ibstock, Leicestershire@
- Ibstone, Buckinghamshire@
- Ickford, Buckinghamshire@
- Ickleford, Hertfordshire@
- Icklesham, East Sussex@
- Ide Hill, Kent@
- Idle and Thackley, West Yorkshire@
- Idmiston, Wiltshire@
- Ightham, Kent@
- Ilchester, Somerset@
- Ilfracombe, Devon@
- Ilkeston, Derbyshire@
- Ilkley, West Yorkshire@
- Illingworth, West Yorkshire@
- Ilmington, Warwickshire@
- Ilminster, Somerset@
- Ilsington, Devon@
- Immingham, Lincolnshire@
- Ingatestone, Essex@
- Ingham, Norfolk@
- Ingleby Barwick, Cleveland@
- Ingleton, North Yorkshire@
- Ingoldmells, Lincolnshire@
- Inkberrow, Worcestershire@
- Innerleithen, Borders@
- Insch, Aberdeenshire@
- Instow, Devon@
- Intake, South Yorkshire@
- Inveraray, Argyll and Bute@
- Inverbervie, Aberdeenshire@
- Invergordon, Highland@
- Invergowrie, Perth and Kinross@
- Inverkeithing, Fife@
- Inverness Area, Highland@
- Inverness, Highland@
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- Inverurie, Aberdeenshire@
- Ipplepen, Devon@
- Ipstones, Staffordshire@
- Ipswich, Suffolk@
- Irchester, Northamptonshire@
- Irnham, Lincolnshire@
- Ironbridge, Shropshire@
- Irthlingborough, Northamptonshire@
- Irvine, North Ayrshire@
- Irvinestown, Fermanagh@
- Isfield, East Sussex@
- Islandmagee, Antrim@
- Isle of Arran, North Ayrshire@
- Isle of Bute, Argyll and Bute@
- Isle of Coll, Argyll and Bute@
- Isle of Colonsay, Argyll and Bute@
- Isle of Gigha, Argyll and Bute@
- Isle of Harris, Western Isles@
- Isle of Iona, Argyll and Bute@
- Isle of Islay, Argyll and Bute@
- Isle of Jura, Argyll and Bute@
- Isle of Lewis, Western Isles@
- Isle of Mull, Argyll and Bute@
- Isle of Oxney, Kent@
- Isle of Sheppey, Kent@
- Isle of Tiree, Argyll and Bute@
- Isles of Scilly, Cornwall@
- Islington, London@
- Itchenor, West Sussex@
- Itteringham, Norfolk@
- Iver Heath, Buckinghamshire@
- Iver, Buckinghamshire@
- Ivinghoe and Pitstone, Buckinghamshire@
- Ivybridge, Devon@
- Iwerne Minster, Dorset@
- Ixworth, Suffolk@
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