| Town Name | District | Unitary Authority | County | Population | Area Size (Ha) | |
|---|---|---|---|---|---|---|
| Ibsley | New Forest | - | Hampshire | 1301 | - | Map |
| Ibstock | North West Leicestershire | - | Leicestershire | 5184 | 120 | Map |
| Ibstone | Wycombe | - | Buckinghamshire | 237 | - | Map |
| Ibthorpe | Test Valley | - | Hampshire | - | - | Map |
| Ibworth | Basingstoke and Deane | - | Hampshire | - | - | Map |
| Ickburgh | Breckland | - | Norfolk | 245 | - | Map |
| Ickenham | Hillingdon | - | Greater London | - | - | Map |
| Ickleford | North Hertfordshire | - | Hertfordshire | 1848 | - | Map |
| Icklesham | Rother | - | Sussex | 2712 | - | Map |
| Ickleton | South Cambridgeshire | - | Cambridgeshire | 655 | - | Map |
| Icklingham | Forest Heath | - | Suffolk | 422 | - | Map |
| Ickornshaw | Craven | - | Yorkshire | - | - | Map |
| Ickworth | St. Edmundsbury | - | Suffolk | 30 | - | Map |
| Idbury | West Oxfordshire | - | Oxfordshire | 112 | - | Map |
| Iddesleigh | West Devon | - | Devon | 198 | - | Map |
| Ide | Teignbridge | - | Devon | 547 | - | Map |
| Ide Hill | Sevenoaks | - | Kent | 1837 | - | Map |
| Ideford | Teignbridge | - | Devon | 342 | - | Map |
| Iden | Rother | - | Sussex | 454 | - | Map |
| Idle | Bradford | - | Yorkshire | - | - | Map |
| Idmiston | Salisbury | - | Wiltshire | 2025 | - | Map |
| Idridgehay | Amber Valley | - | Derbyshire | 265 | - | Map |
| Idstone | Vale of White Horse | - | Oxfordshire | - | - | Map |
| Ifield | Crawley | - | Sussex | - | - | Map |
| Iford | - | Bournemouth | Dorset | - | - | Map |
| Iford | Lewes | - | Sussex | 194 | - | Map |
| Ifton Heath | Oswestry | - | Shropshire | - | - | Map |
| Ightfield | North Shropshire | - | Shropshire | 463 | - | Map |
| Ilam | Staffordshire Moorlands | - | Staffordshire | 126 | - | Map |
| Ilchester | South Somerset | - | Somerset | 1661 | 44 | Map |
| Ilderton | Berwick-upon-Tweed | - | Northumberland | 94 | - | Map |
| Ilford | Newham | - | Greater London | - | - | Map |
| Ilfracombe | North Devon | - | Devon | 11244 | 241 | Map |
| Ilkeston | Erewash | - | Derbyshire | 34599 | 760 | Map |
| Ilketshall | Waveney | - | Suffolk | 279 | - | Map |
| Ilkley | Bradford | - | Yorkshire | 13207 | 421 | Map |
| Illey | Bromsgrove | - | Worcestershire | - | - | Map |
| Illington | Breckland | - | Norfolk | - | - | Map |
| Illogan | Kerrier | - | Cornwall | 5585 | - | Map |
| Illston | Harborough | - | Leicestershire | 178 | - | Map |
| Ilmington | Stratford-on-Avon | - | Warwickshire | 734 | - | Map |
| Ilminster | South Somerset | - | Somerset | 4059 | 101 | Map |
| Ilsington | Teignbridge | - | Devon | 2444 | - | Map |
| Ilton | South Somerset | - | Somerset | 823 | - | Map |
| Imber | West Wiltshire | - | Wiltshire | - | - | Map |
| Immingham | - | North East Lincolnshire | Lincolnshire | 11973 | 1370 | Map |
| Ince | Ellesmere Port & Neston | - | Cheshire | 209 | - | Map |
| Ince | Wigan | - | Lancashire | 10398 | 311 | Map |
| Ince Blundell | Sefton | - | Lancashire | 518 | - | Map |
| Ingatestone | Brentwood | - | Essex | 5775 | 176 | Map |