POSTCODES IN THE UNITED KINGDOM - Y
| Place Name | County | Postcode |
| Y Fan | Powys | SY18 |
| Y Felinheli | Gwynedd | LL56 |
| Y Ffor | Gwynedd | LL53 |
| Yaddlethorpe | North Lincolnshire | DN17 |
| Yafford | Isle of Wight | PO30 |
| Yafforth | North Yorkshire | DL7 |
| Yalding | Kent | ME18 |
| Yanworth | Gloucestershire | GL54 |
| Yapham | E Riding of Yorkshire | YO4 |
| Yapton | West Sussex | BN18 |
| Yarburgh | Lincolnshire | LN11 |
| Yarcombe | Devon | EX14 |
| Yardley | West Midlands | B25 |
| Yardley Gobion | Northamptonshire | NN12 |
| Yardley Hastings | Northamptonshire | NN7 |
| Yardro | Powys | LD8 |
| Yarkhill | Hereford and Worcester | HR1 |
| Yarlet | Staffordshire | ST18 |
| Yarley | Somerset | BA5 |
| Yarlington | Somerset | BA9 |
| Yarm | Stockton-on-Tees | TS15 |
| Yarmouth | Isle of Wight | PO41 |
| Yarnbrook | Wiltshire | BA14 |
| Yarnfield | Staffordshire | ST15 |
| Yarnscombe | Devon | EX31 |
| Yarnton | Oxfordshire | OX5 |
| Yarpole | Hereford and Worcester | HR6 |
| Yarrow | Scottish Borders | TD7 |
| Yarrow Feus | Scottish Borders | TD7 |
| Yarrowford | Scottish Borders | TD7 |
| Yarsop | Hereford and Worcester | HR4 |
| Yarwell | Northamptonshire | PE8 |
| Yate | South Gloucestershire | BS37 |
| Yateley | Hampshire | GU46 |
| Yatesbury | Wiltshire | SN11 |
| Yattendon | Berkshire | RG18 |
| Yatton | Hereford and Worcester | HR6 |
| Yatton | North Somerset | BS19 |
| Yatton Keynell | Wiltshire | SN14 |
| Yaverland | Isle of Wight | PO36 |
| Yaxham | Norfolk | NR19 |
| Yaxley | Cambridgeshire | PE7 |
| Yaxley | Suffolk | IP23 |
| Yazor | Hereford and Worcester | HR4 |
| Yeading | Greater London | UB4 |
| Yeadon | West Yorkshire | LS19 |
| Yealand Conyers | Lancashire | LA5 |
| Yealand Redmayne | Lancashire | LA5 |
| Yealmpton | Devon | PL8 |
| Yearsley | North Yorkshire | YO6 |
| Yeaton | Shropshire | SY4 |
| Yeaveley | Derbyshire | DE6 |
| Yedingham | North Yorkshire | YO17 |
| Yelford | Oxfordshire | OX8 |
| Yelling | Cambridgeshire | PE19 |
| Yelvertoft | Northamptonshire | NN6 |
| Yelverton | Devon | PL20 |
| Yelverton | Norfolk | NR14 |
| Yenston | Somerset | BA8 |
| Yeo Vale | Devon | EX39 |
| Yeoford | Devon | EX17 |
| Yeolmbridge | Cornwall | PL15 |
| Yeomadon | Devon | EX22 |
| Yeovil | Somerset | BA20 |
| Yeovil Marsh | Somerset | BA21 |
| Yeovilton | Somerset | BA22 |
| Yerbeston | Pembrokeshire | SA68 |
| Yesnaby | Orkney Islands | KW16 |
| Yetlington | Northumberland | NE65 |
| Yetminster | Dorset | DT9 |
| Yettington | Devon | EX9 |
| Yetts o'Muckhart | Clackmannanshire | FK14 |
| Yielden | Bedfordshire | MK44 |
| Yiewsley | Greater London | UB7 |
| Ynys | Gwynedd | LL47 |
| Ynysboeth | Rhondda Cynon Taff | CF45 |
| Ynysddu | Caerphilly | NP1 |
| Ynyshir | Rhondda Cynon Taff | CF39 |
| Ynyslas | Ceredigion | SY24 |
| Ynysmeudwy | Neath Port Talbot | SA8 |
| Ynystawe | Swansea | SA6 |
| Ynysybwl | Rhondda Cynon Taff | CF37 |
| Yockenthwaite | North Yorkshire | BD23 |
| Yockleton | Shropshire | SY5 |
| Yokefleet | E Riding of Yorkshire | DN14 |
| Yoker | Glasgow City | G14 |
| Yonder Bognie | Aberdeenshire | AB54 |
| York | York | YO1 |
| Yorkletts | Kent | CT5 |
| Yorkley | Gloucestershire | GL15 |
| Yorton | Shropshire | SY4 |
| Youldon | Devon | EX22 |
| Youldonmoor Cross | Devon | EX22 |
| Youlgreave | Derbyshire | DE45 |
| Youlstone | Devon | EX23 |
| Youlthorpe | E Riding of Yorkshire | YO4 |
| Youlton | North Yorkshire | YO6 |
| Young's End | Essex | CM3 |
| Yoxall | Staffordshire | DE13 |
| Yoxford | Suffolk | IP17 |
| Ysbyty Cynfyn | Ceredigion | SY23 |
| Ysbyty Ifan | Conwy | LL24 |
| Ysbyty Ystwyth | Ceredigion | SY25 |
| Ysceifiog | Flintshire | CH8 |
| Ysgubor-y-coed | Ceredigion | SY20 |
| Ystalyfera | Neath Port Talbot | SA9 |
| Ystrad | Rhondda Cynon Taff | CF40 |
| Ystrad Aeron | Ceredigion | SA48 |
| Ystrad Meurig | Ceredigion | SY25 |
| Ystrad Mynach | Caerphilly | CF82 |
| Ystradfellte | Powys | CF44 |
| Ystradffin | Carmarthenshire | SA20 |
| Ystradgynlais | Powys | SA9 |
| Ystradowen | Neath Port Talbot | SA9 |
| Ystradowen | Vale of Glamorgan | CF71 |
| Ythanwells | Aberdeenshire | AB54 |
| Ythsie | Aberdeenshire | AB41 |
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