Gwynedd
41 postcode sectors mapped mainly to Gwynedd. Choose a district or browse the guides below. These are postcode sectors, not named neighbourhood boundaries.
Postcode districts
Area guides
41 sectors
- LL23 7Near Llanycil
- LL36 0Near Tywyn
- LL36 9Near Bryn-Crug
- LL37 2Near Llwyngwril
- LL38 2Near Arthog
- LL39 1Near Arthog
- LL40 1Near Dolgellau
- LL40 2Near Ganllwyd
- LL40 9Near Dolgellau
- LL41 3Near Ffestiniog
- LL41 4Near Trawsfynydd
- LL41 9Near Ffestiniog
- LL43 2Near Tal-y-bont
- LL44 2Near Dyffryn Ardudwy
- LL45 2Near Llanbedr
- LL46 2Near Harlech
- LL47 6Near Talsarnau
- LL48 6Near Llanfrothen
- LL49 0Near Morfa Bychan
- LL51 9Near Garndolbenmaen
- LL52 0Near Llanystumdwy
- LL53 5Near Pwllheli
- LL53 6Near Llannor
- LL53 7Near Llanengan
- LL53 8Near Botwnnog
- LL53 9Near Pwllheli
- LL54 5Near Clynnog
- LL54 6Near Llanllyfni
- LL54 7Near Llanwnda
- LL55 1Near Caernarfon
- LL55 2Near Waunfawr
- LL55 3Near Brynrefail
- LL55 4Near Gwynedd
- LL55 9Near Caeathro
- LL56 4Near Bethel
- LL57 1Near Bangor
- LL57 2Near Bangor
- LL57 3Near Bethesda
- LL57 4Near Pentir
- LL57 9Near Bangor
- SY20 9Near Glantwymyn
Authority grouping uses mapped sector boundaries from the Office for National Statistics, December 2025. It measures boundary area, not the number of addresses or residents. Guide names describe a place near the approximate sector centre.