| Town Name | District | Unitary Authority | County | Population | Area Size (Ha) | |
|---|---|---|---|---|---|---|
| Oadby | Oadby and Wigston | - | Leicestershire | 19221 | 544 | Map |
| Oak Hangar | East Hampshire | - | Hampshire | - | - | Map |
| Oakamoor | Staffordshire Moorlands | - | Staffordshire | 645 | - | Map |
| Oake | Taunton Deane | - | Somerset | 668 | - | Map |
| Oakengates | - | Telford and Wrekin | Shropshire | 26848 | 914 | Map |
| Oakenshaw | Wakefield | - | Yorkshire | 217 | - | Map |
| Oakford | Mid Devon | - | Devon | 340 | - | Map |
| Oakham | - | Rutland | Rutland | 9101 | 259 | Map |
| Oakhill | Mendip | - | Somerset | - | - | Map |
| Oakington | South Cambridgeshire | - | Cambridgeshire | 2829 | 389 | Map |
| Oakle Street | Forest of Dean | - | Gloucestershire | - | - | Map |
| Oakley | Bedford | - | Bedfordshire | 2333 | 71 | Map |
| Oakley | Aylesbury Vale | - | Buckinghamshire | 1059 | - | Map |
| Oakley | Basingstoke and Deane | - | Hampshire | 5707 | 164 | Map |
| Oaksey | North Wiltshire | - | Wiltshire | 490 | - | Map |
| Oakworth | Bradford | - | Yorkshire | - | - | Map |
| Oare | Swale | - | Kent | 512 | - | Map |
| Oare | Kennet | - | Wiltshire | - | - | Map |
| Oatlands Park | Elmbridge | - | Surrey | - | - | Map |
| Occold | Mid Suffolk | - | Suffolk | 490 | - | Map |
| Ocker Hill | Sandwell | - | Staffordshire | - | - | Map |
| Ockham | Guildford | - | Surrey | 384 | - | Map |
| Ockley | Mole Valley | - | Surrey | 852 | - | Map |
| Ocle Pychard | - | Herefordshire, County of | Herefordshire | 279 | - | Map |
| Oddington | Cherwell | - | Oxfordshire | 133 | - | Map |
| Odell | Bedford | - | Bedfordshire | 260 | - | Map |
| Odiham | Hart | - | Hampshire | 3388 | 99 | Map |
| Odstock | Salisbury | - | Wiltshire | 592 | - | Map |
| Offchurch | Warwick | - | Warwickshire | 262 | - | Map |
| Offenham | Wychavon | - | Worcestershire | 1336 | - | Map |
| Offerton | Sunderland | - | Durham | - | - | Map |
| Offham | Tonbridge and Malling | - | Kent | 732 | - | Map |
| Offham | Lewes | - | Sussex | - | - | Map |
| Offley | North Hertfordshire | - | Hertfordshire | 1307 | - | Map |
| Offord | Huntingdonshire | - | Cambridgeshire | 502 | - | Map |
| Offord D'Arcy | Huntingdonshire | - | Cambridgeshire | - | - | Map |
| Offton | Mid Suffolk | - | Suffolk | 356 | - | Map |
| Offwell | East Devon | - | Devon | 420 | - | Map |
| Ogbourne Saint Andrew | Kennet | - | Wiltshire | 352 | - | Map |
| Ogbourne Saint George | Kennet | - | Wiltshire | 478 | - | Map |
| Okehampton | West Devon | - | Devon | 4768 | 126 | Map |
| Okeover | East Staffordshire | - | Staffordshire | 58 | - | Map |
| Old Bolingbroke | East Lindsey | - | Lincolnshire | 298 | - | Map |
| Old Boston | St. Helens | - | Lancashire | - | - | Map |
| Old Brampton | North East Derbyshire | - | Derbyshire | 1158 | - | Map |
| Old Buckenham | Breckland | - | Norfolk | 1294 | - | Map |
| Old Byland | Ryedale | - | Yorkshire | 141 | - | Map |
| Old Clee | - | North East Lincolnshire | Lincolnshire | - | - | Map |
| Old Dalby | Melton | - | Leicestershire | - | - | Map |
| Old Hill | Sandwell | - | Staffordshire | - | - | Map |