POSTCODES IN THE UNITED KINGDOM - O
| Place Name | County | Postcode |
| Oad Street | Kent | ME9 |
| Oadby | Leicestershire | LE2 |
| Oak Cross | Devon | EX20 |
| Oakamoor | Staffordshire | ST10 |
| Oakbank | West Lothian | EH53 |
| Oakdale | Caerphilly | NP2 |
| Oake | Somerset | TA4 |
| Oaken | Staffordshire | WV8 |
| Oakenclough | Lancashire | PR3 |
| Oakengates | Shropshire | TF2 |
| Oakenhead | Moray | IV31 |
| Oakenshaw | County Durham | DL15 |
| Oakenshaw | West Yorkshire | BD12 |
| Oakford | Ceredigion | SA47 |
| Oakford | Devon | EX16 |
| Oakgrove | Cheshire | SK11 |
| Oakham | Rutland | LE15 |
| Oakhanger | Hampshire | GU35 |
| Oakhill | Somerset | BA3 |
| Oakington | Cambridgeshire | CB4 |
| Oaklands | Conwy | LL26 |
| Oaklands | Hertfordshire | AL6 |
| Oakle Street | Gloucestershire | GL2 |
| Oakleigh Park | Greater London | N20 |
| Oakley | Bedfordshire | MK43 |
| Oakley | Buckinghamshire | HP18 |
| Oakley | Fife | KY12 |
| Oakley | Hampshire | RG23 |
| Oakley | Suffolk | IP21 |
| Oakley Green | Berkshire | SL4 |
| Oakley Park | Powys | SY17 |
| Oakridge | Gloucestershire | GL6 |
| Oaksey | Wiltshire | SN16 |
| Oakshaw Ford | Cumbria | CA6 |
| Oakthorpe | Leicestershire | DE12 |
| Oaktree Hill | North Yorkshire | DL6 |
| Oakwood | Greater London | N14 |
| Oakwoodhill | Surrey | RH5 |
| Oakworth | West Yorkshire | BD22 |
| Oalinlongart | Argyll and Bute | PA23 |
| Oare | Kent | ME13 |
| Oare | Somerset | EX35 |
| Oare | Wiltshire | SN8 |
| Oasby | Lincolnshire | NG32 |
| Oatfield | Argyll and Bute | PA28 |
| Oathlaw | Angus | DD8 |
| Oban | Argyll and Bute | PA34 |
| Obley | Shropshire | SY7 |
| Oborne | Dorset | DT9 |
| Occlestone Green | Cheshire | CW10 |
| Occold | Suffolk | IP23 |
| Occumster | Highland | KW3 |
| Ochiltree | East Ayrshire | KA18 |
| Ochr-y-Mynydd | Merthyr Tydfil | CF48 |
| Ochtermuthill | Perth and Kinross | PH5 |
| Ochtertyre | Perth and Kinross | PH7 |
| Ochtertyre | Stirling | FK9 |
| Ockbrook | Derbyshire | DE72 |
| Ockham | Surrey | GU23 |
| Ockle | Highland | PH36 |
| Ockley | Surrey | RH5 |
| Ocle Pychard | Hereford and Worcester | HR1 |
| Octon | E Riding of Yorkshire | YO25 |
| Odcombe | Somerset | BA22 |
| Odd Down | Bristol Avon | BA2 |
| Oddingley | Hereford and Worcester | WR9 |
| Oddington | Oxfordshire | OX5 |
| Oddsta | Shetland Islands | ZE2 |
| Odell | Bedfordshire | MK43 |
| Odiham | Hampshire | RG29 |
| Odstock | Wiltshire | SP5 |
| Odstone | Leicestershire | CV13 |
| Offchurch | Warwickshire | CV33 |
| Offenham | Hereford and Worcester | WR11 |
| Offerton | Greater Manchester | SK2 |
| Offham | East Sussex | BN8 |
| Offham | Kent | ME19 |
| Offord Cluny | Cambridgeshire | PE18 |
| Offord D'Arcy | Cambridgeshire | PE18 |
| Offton | Suffolk | IP8 |
| Offwell | Devon | EX14 |
| Ogbourne Maizey | Wiltshire | SN8 |
| Ogbourne St Andrew | Wiltshire | SN8 |
| Ogbourne St George | Wiltshire | SN8 |
| Ogden | West Yorkshire | HX2 |
| Ogil | Angus | DD8 |
| Ogle | Northumberland | NE20 |
| Ogmore | Vale of Glamorgan | CF32 |
| Ogmore Vale | Bridgend | CF32 |
| Ogmore-by-Sea | Vale of Glamorgan | CF32 |
| Oil Terminal | Orkney Islands | KW16 |
| Okeford Fitzpaine | Dorset | DT11 |
| Okehampton | Devon | EX20 |
| Okehampton Camp | Devon | EX20 |
| Okraquoy | Shetland Islands | ZE2 |
| Old | Northamptonshire | NN6 |
| Old Aberdeen | Aberdeen City | AB2 |
| Old Alresford | Hampshire | SO24 |
| Old Arley | Warwickshire | CV7 |
| Old Basford | Nottinghamshire | NG6 |
| Old Basing | Hampshire | RG24 |
| Old Bewick | Northumberland | NE66 |
| Old Bolingbroke | Lincolnshire | PE23 |
| Old Brampton | Derbyshire | S42 |
| Old Bridge of Urr | Dumfries and Galloway | DG7 |
| Old Buckenham | Norfolk | NR17 |
| Old Burghclere | Hampshire | RG20 |
| Old Byland | North Yorkshire | YO62 |
| Old Cleeve | Somerset | TA24 |
| Old Colwyn | Conwy | LL29 |
| Old Craig | Aberdeenshire | AB41 |
| Old Craighall | East Lothian | EH22 |
| Old Crombie | Aberdeenshire | AB54 |
| Old Dailly | South Ayrshire | KA26 |
| Old Dalby | Leicestershire | LE14 |
| Old Deer | Aberdeenshire | AB42 |
| Old Ellerby | E Riding of Yorkshire | HU11 |
| Old Felixstowe | Suffolk | IP11 |
| Old Fletton | Cambridgeshire | PE2 |
| Old Ford | Greater London | E3 |
| Old Glossop | Derbyshire | SK13 |
| Old Goginan | Ceredigion | SY23 |
| Old Goole | E Riding of Yorkshire | DN14 |
| Old Gore | Hereford and Worcester | HR9 |
| Old Hall | E Riding of Yorkshire | HU12 |
| Old Heath | Essex | CO2 |
| Old Hill | West Midlands | B64 |
| Old Hutton | Cumbria | LA8 |
| Old Kea | Cornwall | TR3 |
| Old Kent Road | Greater London | SE1 |
| Old Kilpatrick | West Dunbarton | G60 |
| Old Kinnernie | Aberdeenshire | AB32 |
| Old Knebworth | Hertfordshire | SG3 |
| Old Leake | Lincolnshire | PE22 |
| Old Leslie | Aberdeenshire | AB52 |
| Old Malton | North Yorkshire | YO17 |
| Old Micklefield | West Yorkshire | LS25 |
| Old Milverton | Warwickshire | CV32 |
| Old Netley | Hampshire | SO31 |
| Old Newton | Suffolk | IP14 |
| Old Oak Common | Greater London | NW10 |
| Old Philpstoun | West Lothian | EH49 |
| Old Portlethen | Aberdeenshire | AB1 |
| Old Radnor | Powys | LD8 |
| Old Rattray | Aberdeenshire | AB42 |
| Old Rayne | Aberdeenshire | AB52 |
| Old Romney | Kent | TN29 |
| Old Scone | Perth and Kinross | PH2 |
| Old Shields | North Lanarkshire | G67 |
| Old Sodbury | South Gloucestershire | BS37 |
| Old Somerby | Lincolnshire | NG33 |
| Old Stratford | Northamptonshire | MK19 |
| Old Street | Greater London | EC1 |
| Old Sunderlandwick | E Riding of Yorkshire | YO25 |
| Old Swarland | Northumberland | NE65 |
| Old Swinford | West Midlands | DY8 |
| Old Town | Cumbria | LA6 |
| Old Town | Northumberland | NE19 |
| Old Tupton | Derbyshire | S42 |
| Old Warden | Bedfordshire | SG18 |
| Old Weston | Cambridgeshire | PE17 |
| Old Windsor | Berkshire | SL4 |
| Old Wives Lees | Kent | CT4 |
| Old Woking | Surrey | GU22 |
| Old Wolverton | Milton Keynes | MK12 |
| Oldberrow | Warwickshire | B95 |
| Oldborough | Devon | EX17 |
| Oldbury | Kent | TN15 |
| Oldbury | Shropshire | WV16 |
| Oldbury | Warwickshire | CV10 |
| Oldbury | West Midlands | B69 |
| Oldbury Naite | South Gloucestershire | BS12 |
| Oldbury on the Hill | Gloucestershire | GL9 |
| Oldbury-on-Severn | South Gloucestershire | BS12 |
| Oldcastle | Monmouthshire | NP7 |
| Oldcastle Heath | Cheshire | SY14 |
| Oldcotes | Nottinghamshire | S81 |
| Oldfield | Hereford and Worcester | WR9 |
| Oldfield | West Yorkshire | BD22 |
| Oldford | Somerset | BA11 |
| Oldhall | Aberdeenshire | AB34 |
| Oldhall | Highland | KW1 |
| Oldham | Greater Manchester | OL1 |
| Oldhamstocks | East Lothian | TD13 |
| Oldhurst | Cambridgeshire | PE17 |
| Oldland | South Gloucestershire | BS30 |
| Oldmeldrum | Aberdeenshire | AB51 |
| Oldmill | Aberdeenshire | AB31 |
| Oldpark | Shropshire | TF3 |
| Oldridge | Devon | EX4 |
| Oldshore Beg | Highland | IV27 |
| Oldstead | North Yorkshire | YO6 |
| Oldtown of Aigas | Highland | IV4 |
| Oldtown of Ord | Aberdeenshire | AB45 |
| Oldwalls | Swansea | SA3 |
| Oldways End | Devon | EX16 |
| Oldwhat | Aberdeenshire | AB53 |
| Olgrinmore | Highland | KW12 |
| Oliver | Scottish Borders | ML12 |
| Oliver's Battery | Hampshire | SO22 |
| Ollaberry | Shetland Islands | ZE2 |
| Ollerton | Cheshire | WA16 |
| Ollerton | Nottinghamshire | NG22 |
| Ollerton | Shropshire | TF9 |
| Olney | Milton Keynes | MK46 |
| Olney | Northamptonshire | NN12 |
| Olton | West Midlands | B92 |
| Olveston | South Gloucestershire | BS12 |
| Olympia | Greater London | W14 |
| Ombersley | Hereford and Worcester | WR9 |
| Ompton | Nottinghamshire | NG22 |
| Onchan | Isle of Man | IM3 1-4 |
| Onecote | Staffordshire | ST13 |
| Ongar Hill | Norfolk | PE34 |
| Ongar Street | Hereford and Worcester | HR6 |
| Onibury | Shropshire | SY7 |
| Onich | Highland | PH33 |
| Onllwyn | Neath Port Talbot | SA10 |
| Onneley | Shropshire | CW3 |
| Onslow Village | Surrey | GU2 |
| Opinan | Highland | IV21 |
| Opinan | Highland | IV22 |
| Orange Lane | Scottish Borders | TD12 |
| Orbliston | Moray | IV32 |
| Orbost | Highland | IV55 |
| Orby | Lincolnshire | PE24 |
| Orcadia | Argyll and Bute | PA20 |
| Orchard | Argyll and Bute | PA23 |
| Orchard Portman | Somerset | TA3 |
| Orchard Wyndham | Somerset | TA4 |
| Orcheston | Wiltshire | SP3 |
| Orcop | Hereford and Worcester | HR2 |
| Orcop Hill | Hereford and Worcester | HR2 |
| Ord | Highland | IV46 |
| Ordhead | Aberdeenshire | AB51 |
| Ordie | Aberdeenshire | AB34 |
| Ordiequish | Moray | IV32 |
| Ordsall | Nottinghamshire | DN22 |
| Ore | East Sussex | TN35 |
| Oreham Common | West Sussex | BN5 |
| Oreston | Devon | PL9 |
| Oreton | Shropshire | DY14 |
| Orford | Cheshire | WA2 |
| Orford | Suffolk | IP12 |
| Orgreave | Staffordshire | DE13 |
| Orleton | Hereford and Worcester | SY8 |
| Orleton | Hereford and Worcester | WR6 |
| Orleton Common | Hereford and Worcester | SY8 |
| Orlingbury | Northamptonshire | NN14 |
| Ormesby | Middlesbrough | TS3 |
| Ormesby St Margaret | Norfolk | NR29 |
| Ormesby St Michael | Norfolk | NR29 |
| Ormiscaig | Highland | IV22 |
| Ormiston | East Lothian | EH35 |
| Ormsaigmore | Highland | PH36 |
| Ormsdale | Argyll and Bute | PA22 |
| Ormskirk | Lancashire | L39 |
| Ormwe | Highland | KW14 |
| Orphir | Orkney Islands | KW17 |
| Orpington | Greater London | BR6 |
| Orrell | Greater Manchester | WN5 |
| Orrisdale | Isle of Man | IM6 |
| Orrok Ho. | Aberdeenshire | AB23 |
| Orroland | Dumfries and Galloway | DG6 |
| Orsett | Essex | RM16 |
| Orslow | Staffordshire | TF10 |
| Orston | Nottinghamshire | NG13 |
| Orton | Cumbria | CA10 |
| Orton | Northamptonshire | NN14 |
| Orton Longueville | Cambridgeshire | PE2 |
| Orton Waterville | Cambridgeshire | PE2 |
| Orton-on-the-Hill | Leicestershire | CV9 |
| Orwell | Cambridgeshire | SG8 |
| Osbaldeston | Lancashire | BB2 |
| Osbaldwick | York | YO1 |
| Osbaston | Leicestershire | CV13 |
| Osbaston | Shropshire | TF6 |
| Osborne | Isle of Wight | PO32 |
| Osbournby | Lincolnshire | NG34 |
| Oscroft | Cheshire | CH3 |
| Ose | Highland | IV56 |
| Osgathorpe | Leicestershire | LE12 |
| Osgodby | Lincolnshire | LN8 |
| Osgodby | North Yorkshire | YO11 |
| Osgodby | North Yorkshire | YO8 |
| Osidge | Greater London | N14 |
| Oskaig | Highland | IV40 |
| Osmaston | Derby | DE24 |
| Osmaston | Derbyshire | DE6 |
| Osmington | Dorset | DT3 |
| Osmington Mills | Dorset | DT3 |
| Osmotherley | North Yorkshire | DL6 |
| Osney | Oxfordshire | OX2 |
| Ospringe | Kent | ME13 |
| Ossett | West Yorkshire | WF5 |
| Ossington | Nottinghamshire | NG23 |
| Ostend | Essex | CM0 |
| Osterley | Greater London | TW7 |
| Osterley Park | Greater London | TW7 |
| Oswaldkirk | North Yorkshire | YO62 |
| Oswaldtwistle | Lancashire | BB5 |
| Oswestry | Shropshire | SY11 |
| Otford | Kent | TN14 |
| Otham | Kent | ME15 |
| Othery | Somerset | TA7 |
| Otley | Suffolk | IP6 |
| Otley | West Yorkshire | LS21 |
| Otter | Argyll and Bute | PA21 |
| Otter Ferry | Argyll and Bute | PA21 |
| Otterbourne | Hampshire | SO21 |
| Otterburn | North Yorkshire | BD23 |
| Otterburn | Northumberland | NE19 |
| Otterburn Camp | Northumberland | NE19 |
| Otterden Place | Kent | ME13 |
| Otterham | Cornwall | PL32 |
| Otterhampton | Somerset | TA5 |
| Ottershaw | Surrey | KT16 |
| Otterswick | Shetland Islands | ZE2 |
| Otterton | Devon | EX9 |
| Ottery St Mary | Devon | EX11 |
| Ottinge | Kent | CT4 |
| Ottringham | E Riding of Yorkshire | HU12 |
| Oughterby | Cumbria | CA5 |
| Oughtershaw | North Yorkshire | BD23 |
| Oughtibridge | South Yorkshire | S30 |
| Oulston | North Yorkshire | YO6 |
| Oulton | Cumbria | CA7 |
| Oulton | Norfolk | NR11 |
| Oulton | Staffordshire | ST15 |
| Oulton | Suffolk | NR32 |
| Oulton | West Yorkshire | LS26 |
| Oulton Broad | Suffolk | NR33 |
| Oulton Street | Norfolk | NR11 |
| Oundle | Northamptonshire | PE8 |
| Ousby | Cumbria | CA10 |
| Ousdale | Highland | KW7 |
| Ousden | Suffolk | CB8 |
| Ousefleet | E Riding of Yorkshire | DN14 |
| Ouston | County Durham | DH2 |
| Ouston | Northumberland | NE18 |
| Out Newton | E Riding of Yorkshire | HU19 |
| Out Rawcliffe | Lancashire | PR3 |
| Outertown | Orkney Islands | KW16 |
| Outgate | Cumbria | LA22 |
| Outhgill | Cumbria | CA17 |
| Outlands | Staffordshire | ST20 |
| Outlane | West Yorkshire | HD3 |
| Outwell | Cambridgeshire | PE14 |
| Outwood | Surrey | RH1 |
| Outwood | West Yorkshire | WF1 |
| Oval | Greater London | SE11 |
| Ovenden | West Yorkshire | HX3 |
| Over | Cambridgeshire | CB4 |
| Over | Cheshire | CW7 |
| Over | South Gloucestershire | BS12 |
| Over Compton | Dorset | DT9 |
| Over End | Derbyshire | DE45 |
| Over Haddon | Derbyshire | DE45 |
| Over Kellet | Lancashire | LA6 |
| Over Kiddington | Oxfordshire | OX20 |
| Over Norton | Oxfordshire | OX7 |
| Over Peover | Cheshire | WA16 |
| Over Rankeilour | Fife | KY15 |
| Over Silton | North Yorkshire | YO7 |
| Over Stowey | Somerset | TA5 |
| Over Stratton | Somerset | TA13 |
| Over Tabley | Cheshire | WA16 |
| Over Wallop | Hampshire | SO20 |
| Over Whitacre | Warwickshire | B46 |
| Over Worton | Oxfordshire | OX7 |
| Overbister | Orkney Islands | KW17 |
| Overbury | Hereford and Worcester | GL20 |
| Overcombe | Dorset | DT3 |
| Overleigh | Somerset | BA16 |
| Overpool | Cheshire | L65 |
| Overseal | Derbyshire | DE12 |
| Oversland | Kent | ME13 |
| Oversley Green | Warwickshire | B49 |
| Overstone | Northamptonshire | NN6 |
| Overstrand | Norfolk | NR27 |
| Overton | Aberdeen City | AB2 |
| Overton | Aberdeenshire | AB51 |
| Overton | Hampshire | RG25 |
| Overton | Lancashire | LA3 |
| Overton | North Yorkshire | YO30 |
| Overton | Shropshire | SY8 |
| Overton | Swansea | SA3 |
| Overton | Wrexham | LL13 |
| Overtown | North Lanarkshire | ML2 |
| Overy Staithe | Norfolk | PE31 |
| Oving | Buckinghamshire | HP22 |
| Oving | West Sussex | PO20 |
| Ovingdean | Brighton and Hove | BN2 |
| Ovingham | Northumberland | NE42 |
| Ovington | County Durham | DL11 |
| Ovington | Essex | CO10 |
| Ovington | Hampshire | SO24 |
| Ovington | Norfolk | IP25 |
| Ovington | Northumberland | NE42 |
| Ower | Hampshire | SO51 |
| Owermoigne | Dorset | DT2 |
| Owlswick | Buckinghamshire | HP27 |
| Owmby | Lincolnshire | DN38 |
| Owmby by Spital | Lincolnshire | LN2 |
| Owslebury | Hampshire | SO21 |
| Owston | Leicestershire | LE15 |
| Owston Ferry | North Lincolnshire | DN9 |
| Owstwick | E Riding of Yorkshire | HU12 |
| Owthorpe | Nottinghamshire | NG12 |
| Oxborough | Norfolk | PE33 |
| Oxcliffe Hill | Lancashire | LA3 |
| Oxcombe | Lincolnshire | LN9 |
| Oxen End | Essex | CM7 |
| Oxen Park | Cumbria | LA12 |
| Oxenholme | Cumbria | LA9 |
| Oxenhope | West Yorkshire | BD22 |
| Oxenton | Gloucestershire | GL52 |
| Oxenwood | Wiltshire | SN8 |
| Oxford | Oxfordshire | OX1 |
| Oxford Circus | Greater London | W1 |
| Oxford Street | Greater London | W1 |
| Oxhill | Warwickshire | CV35 |
| Oxley | West Midlands | WV10 |
| Oxley's Green | East Sussex | TN32 |
| Oxnam | Scottish Borders | TD8 |
| Oxnead | Norfolk | NR10 |
| Oxnop Ghyll | North Yorkshire | DL8 |
| Oxshott | Surrey | KT22 |
| Oxspring | South Yorkshire | S30 |
| Oxted | Surrey | RH8 |
| Oxton | Merseyside | CH43 |
| Oxton | Nottinghamshire | NG25 |
| Oxton | Scottish Borders | TD2 |
| Oxwich | Swansea | SA3 |
| Oxwich Green | Swansea | SA3 |
| Oxwick | Norfolk | NR21 |
| Oykel Bridge | Highland | IV27 |
| Oyne | Aberdeenshire | AB52 |
| Ozleworth | Gloucestershire | GL12 |
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