POSTCODES IN THE UNITED KINGDOM - J
| Place Name | County | Postcode |
| Jack Hill | North Yorkshire | LS21 |
| Jackstown | Aberdeenshire | AB51 |
| Jackton | South Lanarkshire | G75 |
| Jacobstow | Cornwall | EX23 |
| Jacobstowe | Devon | EX20 |
| Jameston | Pembrokeshire | SA70 |
| Jamestown | Dumfries and Galloway | DG13 |
| Jamestown | Highland | IV14 |
| Jamestown | West Dunbart | G83 |
| Janefield | Highland | IV10 |
| Janetstown | Highland | KW14 |
| Jarrow | Tyne and Wear | NE32 |
| Jarvis Brook | East Sussex | TN6 |
| Jasper's Green | Essex | CM7 |
| Jawcraig | Falkirk | FK1 |
| Jayes Park | Surrey | RH5 |
| Jaywick | Essex | CO15 |
| Jedburgh | Scottish Borders | TD8 |
| Jeffreyston | Pembrokeshire | SA68 |
| Jemimaville | Highland | IV7 |
| Jersay | North Lanarkshire | ML7 |
| Jerviswood | South Lanarkshire | ML11 |
| Jesmond | Tyne and Wear | NE2 |
| Jevington | East Sussex | BN26 |
| Jodrell Bank | Cheshire | SK11 |
| John o'Groats | Highland | KW1 |
| John's Cross | East Sussex | TN32 |
| Johnby | Cumbria | CA11 |
| Johnshaven | Aberdeenshire | DD10 |
| Johnston | Pembrokeshire | SA62 |
| Johnston Mains | Aberdeenshire | AB30 |
| Johnstone | Renfrewshire | PA5 |
| Johnstone Castle | Renfrewshire | PA5 |
| Johnstonebridge | Dumfries and Galloway | DG11 |
| Johnstown | Carmarthenshire | SA31 |
| Johnstown | Wrexham | LL14 |
| Joppa | City of Edinburgh | EH15 |
| Joppa | South Ayrshire | KA6 |
| Jordans | Buckinghamshire | HP9 |
| Jordanston | Pembrokeshire | SA62 |
| Jordanstone | Perth and Kinross | PH11 |
| Jump | South Yorkshire | S74 |
| Juniper Green | City of Edinburgh | EH14 |
| Jurby East | Isle of Man | IM7 |
| Jurby West | Isle of Man | IM7 |
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