Postcodes in Isle of Anglesey Unitary Authority

  1. All administrative areas

This page provides postcode data for the Isle of Anglesey UK Unitary Authority.

In 2021, Isle of Anglesey contained approximately 30,800 households with a population of about 68,900

In 2011, Isle of Anglesey contained approximately 30,594 households with a population of about 69,751

Website: https://www.anglesey.gov.wales/

Wards in this Unitary Authority
Aethwy ,   Bodowyr ,   Bro Aberffraw ,   Bro'r Llynnoedd ,   Canolbarth Môn ,   Cefni ,   Crigyll ,   Lligwy ,   Parc a'r Mynydd ,   Seiriol ,   Talybolion ,   Tref Cybi ,   Twrcelyn ,   Ynys Gybi
Parishes in this Unitary Authority
Aberffraw ,   Amlwch ,   Beaumaris ,   Bodedern ,   Bodffordd ,   Bodorgan ,   Bryngwran ,   Cwm Cadnant ,   Cylch-y-Garn ,   Holyhead ,   Llanbadrig ,   Llanddaniel Fab ,   Llanddona ,   Llanddyfnan ,   Llaneilian ,   Llaneugrad ,   Llanfachraeth ,   Llanfaelog ,   Llanfaethlu ,   Llanfair Pwllgwyngyll ,   Llanfair-Mathafarn-Eithaf ,   Llanfair-yn-Neubwll ,   Llanfihangel Ysgeifiog ,   Llangefni ,   Llangoed ,   Llangristiolus ,   Llanidan ,   Llannerch-y-medd ,   Mechell ,   Menai Bridge ,   Moelfre ,   Penmynydd ,   Pentraeth ,   Rhoscolyn ,   Rhosybol ,   Rhosyr ,   Trearddur ,   Tref Alaw ,   Trewalchmai ,   Valley
Key Active postcodeActive postcode Postcode no longer in usePostcode no longer in use

Postcode Ward Latitude Longitude Easting Northing Grid ref
LL58 8AA Seiriol 53.263416 -4.092591 260524 376090 SH605760
LL58 8AB Seiriol 53.264142 -4.093736 260450 376173 SH604761
LL58 8AD Seiriol 53.264135 -4.094111 260425 376173 SH604761
LL58 8AE Seiriol 53.264219 -4.094999 260366 376184 SH603761
LL58 8AF Seiriol 53.264335 -4.093011 260499 376193 SH604761
LL58 8AG Seiriol 53.264374 -4.093837 260444 376199 SH604761
LL58 8AH Seiriol 53.261694 -4.094366 260400 375902 SH603759
LL58 8AJ Seiriol 53.263205 -4.092851 260506 376067 SH605760
LL58 8AL Seiriol 53.264186 -4.091744 260583 376174 SH605761
LL58 8AN Seiriol 53.263491 -4.091365 260606 376096 SH606760
LL58 8AP Seiriol 53.263361 -4.091599 260590 376082 SH605760
LL58 8AQ Seiriol 53.295136 -4.158067 256264 379748 SH562797
LL58 8AR Seiriol 53.26301 -4.092691 260516 376045 SH605760
LL58 8AS Seiriol 53.262619 -4.092912 260500 376002 SH604760
LL58 8AT Seiriol 53.292764 -4.085713 261078 379341 SH610793
LL58 8AU Seiriol 53.262628 -4.092897 260501 376003 SH605760
LL58 8AW Seiriol 53.263344 -4.091568 260592 376080 SH605760
LL58 8AX Seiriol 53.26465 -4.09757 260196 376237 SH601762
LL58 8AY Seiriol 53.262628 -4.092897 260501 376003 SH605760
LL58 8AZ Seiriol 53.258411 -4.102152 259870 375552 SH598755
LL58 8BA Seiriol 53.262432 -4.093818 260439 375983 SH604759
LL58 8BB Seiriol 53.262684 -4.09329 260475 376010 SH604760
LL58 8BD Seiriol 53.262311 -4.094606 260386 375971 SH603759
LL58 8BE Seiriol 53.262408 -4.095211 260346 375983 SH603759
LL58 8BG Seiriol 53.262251 -4.095923 260298 375967 SH602759
LL58 8BH Seiriol 53.261876 -4.097344 260202 375928 SH602759
LL58 8BL Seiriol 53.261823 -4.099306 260071 375926 SH600759
LL58 8BN Seiriol 53.261077 -4.098789 260103 375842 SH601758
LL58 8BP Seiriol 53.262772 -4.09241 260534 376018 SH605760
LL58 8BQ Seiriol 53.262928 -4.092207 260548 376035 SH605760
LL58 8BS Seiriol 53.262789 -4.091961 260564 376019 SH605760
LL58 8BT Seiriol 53.263201 -4.090991 260630 376063 SH606760
LL58 8BU Seiriol 53.263342 -4.090128 260688 376077 SH606760
LL58 8BW Seiriol 53.26235 -4.093394 260467 375973 SH604759
LL58 8BY Seiriol 53.263784 -4.08952 260730 376125 SH607761
LL58 8DA Seiriol 53.263672 -4.090309 260677 376114 SH606761
LL58 8DB Seiriol 53.263987 -4.092349 260542 376153 SH605761
LL58 8DD Seiriol 53.261694 -4.094366 260400 375902 SH603759
LL58 8DE Seiriol 53.262619 -4.092912 260500 376002 SH604760
LL58 8DL Seiriol 53.2637 -4.0928 260511 376122 SH605761
LL58 8DN Seiriol 53.263258 -4.093888 260437 376075 SH604760
LL58 8DP Seiriol 53.262786 -4.09364 260452 376022 SH604760
LL58 8DR Seiriol 53.2626 -4.093496 260461 376001 SH604760
LL58 8DS Seiriol 53.262612 -4.094351 260404 376004 SH604760
LL58 8DT Seiriol 53.262487 -4.094315 260406 375990 SH604759
LL58 8DU Seiriol 53.263266 -4.094473 260398 376077 SH603760
LL58 8DW Seiriol 53.262926 -4.093887 260436 376038 SH604760
LL58 8DY Seiriol 53.26361 -4.094835 260375 376116 SH603761
LL58 8EA Seiriol 53.26363 -4.095256 260347 376119 SH603761
LL58 8EB Seiriol 53.263052 -4.094868 260371 376054 SH603760
LL58 8ED Seiriol 53.262732 -4.095707 260314 376020 SH603760
LL58 8EE Seiriol 53.262076 -4.098209 260145 375952 SH601759
LL58 8EF Seiriol 53.262143 -4.096952 260229 375957 SH602759
LL58 8EG Seiriol 53.262644 -4.097652 260184 376014 SH601760
LL58 8EH Seiriol 53.263156 -4.097662 260185 376071 SH601760
LL58 8EJ Seiriol 53.263017 -4.094296 260409 376049 SH604760
LL58 8EL Seiriol 53.263359 -4.096862 260239 376092 SH602760
LL58 8EN Seiriol 53.263225 -4.095761 260312 376075 SH603760
LL58 8EP Seiriol 53.26341 -4.0955 260330 376095 SH603760
LL58 8ER Seiriol 53.263702 -4.095724 260316 376128 SH603761
LL58 8ES Seiriol 53.264784 -4.095072 260363 376247 SH603762
LL58 8ET Seiriol 53.264532 -4.0956 260327 376220 SH603762
LL58 8EU Seiriol 53.2639 -4.096258 260281 376151 SH602761
LL58 8EW Seiriol 53.263494 -4.095819 260309 376105 SH603761
LL58 8EY Seiriol 53.263852 -4.097456 260201 376148 SH602761
LL58 8HA Seiriol 53.263198 -4.098308 260142 376077 SH601760
LL58 8HB Seiriol 53.262662 -4.098672 260116 376018 SH601760
LL58 8HD Seiriol 53.263479 -4.099762 260046 376111 SH600761
LL58 8HE Seiriol 53.264068 -4.099476 260067 376176 SH600761
LL58 8HF Seiriol 53.264705 -4.100077 260029 376248 SH600762
LL58 8HG Seiriol 53.263421 -4.100973 259965 376107 SH599761
LL58 8HH Seiriol 53.263747 -4.101874 259906 376145 SH599761
LL58 8HL Seiriol 53.264743 -4.102493 259868 376257 SH598762
LL58 8HN Seiriol 53.264815 -4.100952 259971 376262 SH599762
LL58 8HP Seiriol 53.265086 -4.096287 260283 376283 SH602762
LL58 8HR Seiriol 53.264279 -4.097702 260186 376196 SH601761
LL58 8HU Seiriol 53.276498 -4.10121 259992 377562 SH599775
LL58 8HW Seiriol 53.264944 -4.097194 260222 376269 SH602762
LL58 8HY Seiriol 53.275538 -4.088308 260849 377430 SH608774
LL58 8LA Seiriol 53.264363 -4.095996 260300 376202 SH602762
LL58 8LB Seiriol 53.276947 -4.091002 260674 377592 SH606775
LL58 8LD Seiriol 53.277479 -4.090923 260681 377651 SH606776
LL58 8LE Seiriol 53.277974 -4.090392 260718 377705 SH607777
LL58 8LF Seiriol 53.278176 -4.091167 260667 377729 SH606777
LL58 8LG Seiriol 53.278154 -4.091916 260617 377728 SH606777
LL58 8LH Seiriol 53.278431 -4.090985 260680 377757 SH606777
LL58 8LJ Seiriol 53.27861 -4.093588 260507 377782 SH605777
LL58 8LL Seiriol 53.278817 -4.096163 260336 377810 SH603778
LL58 8LN Seiriol 53.27949 -4.101852 259959 377896 SH599778
LL58 8LP Seiriol 53.27953 -4.094968 260418 377887 SH604778
LL58 8LQ Seiriol 53.282223 -4.093645 260515 378184 SH605781
LL58 8LR Seiriol 53.285446 -4.091867 260644 378539 SH606785
LL58 8LS Seiriol 53.290035 -4.089601 260810 379045 SH608790
LL58 8LT Seiriol 53.290979 -4.089122 260845 379149 SH608791
LL58 8LU Seiriol 53.291853 -4.089494 260823 379247 SH608792
LL58 8LW Seiriol 53.284097 -4.106218 259683 378417 SH596784
LL58 8LX Seiriol 53.290999 -4.090503 260753 379154 SH607791
LL58 8LY Seiriol 53.291223 -4.091054 260717 379180 SH607791
LL58 8NA Seiriol 53.292722 -4.089192 260846 379343 SH608793
LL58 8NB Seiriol 53.293373 -4.091024 260726 379419 SH607794
Contains OS data © Crown copyright and database right 2026
Contains Royal Mail data © Royal Mail copyright and database right 2026
Contains National Statistics data © Crown copyright and database rights 2026
Source: Office for National Statistics licensed under the Open Government Licence v.3.0
Contains data from Wikipedia covered by the Creative Commons license




© 2026 Chris Bell [ Email ] [ Bluesky ] [ Strava ] [ Privacy ]