The first three characters of your new post code (your Eircode) is called the routing key. This is an area code that identifies which part of the country you live in. Eircode has not published the list of routing keys yet or stated if it ever will. So I’ve put together a quick list of Irish towns with their routing keys for your future reference.

Eircode says there are 139 routing keys. I count 34 in Dublin so that leaves 105 for the rest of the country.  That means each county gets an average of just 4 routing keys. So the areas are too large to be very useful for narrowing down a location. The routing keys have been chosen to match An Post’s existing distribution system. Some routing keys cross county boundaries.

I would be very grateful if you could let me know of any codes I am missing or of any mistakes I may have made in compiling this list. Just leave a comment at the end.

Eventually I should have enough information to make a map showing the routing key boundaries. Here is a link to a map being made elsewhere: crowdsourced routing key map

You can download a copy of the technical specs for Eircode here:

Eircode technical spec

Boundary maps of A94, A96 and D18 areas:

A94 Map

A94 Eircode Routing key map
A94 Eircode Routing key map

A96 Map

A96 Eircode Routing key map
A96 Eircode Routing key map

D18 Map

D18 Eircode Routing key map
D18 Eircode Routing key map

Gamma, an Irish company that provides Eircode services, has made a complete map of the routing key boundaries. You can see it here:

Here’s a fragment of Gamma’s map for Dublin:

Eircode routing key boundaries near Dún Laoghaire
Eircode routing key boundaries near Dún Laoghaire
Eircode Routing Keys
Send errors and omissions to @smytho
A41 Ballyboughal
A42 Garristown
A45 Oldtown
A63 Greystones
A67 Wicklow
A75 Castleblayney
A81 Carrickmacross
A82 Kells Kingscourt Virginia
A83 Enfield Summerhill  Rathmoylon
A84 Ashbourne
A85 Dunshaughlin
A86 Dunboyne
A91 Dundalk
A92 Drogheda Ardee  Dunleer
A94 Blackrock Monkstown Booterstown  Stillorgan
A96 Dun Laoghaire Dalkey Sallynoggin Glenageary
A98 Bray Kilmacanogue  Roundwood
C15 Trim Navan Athboy
D01 Dublin 1
D02 Dublin 2
D03 Dublin 3
D04 Dublin 4
D05 Dublin 5
D06 Dublin 6
D6W Dublin 6W
D07 Dublin 7
D08 Dublin 8
D09 Dublin 9
D10 Dublin 10
D11 Dublin 11
D12 Dublin 12
D13 Dublin 13
D14 Dublin 14
D15 Dublin 15
D16 Dublin 16
D17 Dublin 17
D18 Dublin 18
D20 Dublin 20
D22 Dublin 22
D24 Dublin 24
E21 Cahir
E25 Cashel
E32 Carrick on Suir
E34 Tipperary
E41 Thurles Templemore
E45 Nenagh
E53 Roscrea
E91 Clonmel Fethard
F12 Knock Swinford Claremorris
F23 Castlebar
F26 Ballina Bangor
F28 Westport Achill
F31 Ballinrobe
F35 Ballyhaunis
F42 Roscommon
F45 Castlerea Glenamaddy
F52 Boyle
F56 Ballymote
F91 Sligo Manorhamilton Tubbercurry
F92 Letterkenny
F93 Lifford Carndonagh
F94 Bundoran Donegal
H12 Cavan
H14 Belturbet
H16 Cootehill
H18 Monaghan
H23 Clones
H53 Ballinasloe Portumna
H54 Tuam
H62 Loughrea
H65 Athenry
H71 Clifden
H91 Galway Spiddal Headford Ballyvaughan
K32 Balbriggan
K34 Skerries
K36 Malahide Donabate
K45 Lusk
K56 Rush
K67 Swords
K78 Lucan
N37 Athlone Moate
N39 Longford Ballymahon Granard Lanesborough
N41 Carrick On Shannon
N91 Mullingar Kinnegad
P12 Macroom
P14 Crookstown
P17 Kinsale
P24 Cobh
P25 Midleton
P31 Ballincollig
P32 Rylane
P36 Youghal
P43 Carrigaline
P47 Dunmanway
P51 Mallow  Rathmore  Cappoquin
P56 Charleville
P61 Fermoy  Rathcormac
P67 Mitchelstown
P72 Bandon
P75 Bantry Glengarriff
P81 Skibbereen Baltimore
P85 Clonakilty Rosscarbery
R14 Athy
R21 Bagenalstown
R32 Portlaoise Abbeyleix Portarlington
R35 Tullamore Walsh Island, Offaly
R42 Birr Banagher
R45 Edenderry
R51 Kildare
R56 Curragh
R93 Carlow Tullow
R95 Kilkenny Graiguenamanagh Thomastown
T12 Cork city southside Mahon  Passage West
T23 Cork city northside Hollyhill
T34 Carrignavar
T45 Glanmire  Carrigtwohill
T56 Watergrasshill
V14 Shannon
V15 Kilrush  Kilkee
V23 Caherciveen
V31 Listowel
V35 Kilmallock
V42 Newcastle West
V92 Tralee Dingle
V93 Kenmare Killarney
V94 Limerick Abbeyfeale  Newport  Killaloe-Ballina
V95 Miltown Malbay Ennis  Kildysart
W12 Newbridge
W23 Maynooth Celbridge Leixlip
W34 Monasterevin
W91 Naas Blessington
X35 Dungarvan
X42 Kilmacthomas Bunmahon
X91 Waterford Dunmore East Tramore
Y14 Arklow
Y21 Enniscorthy Bunclody
Y25 Gorey
Y34 New Ross Fethard On Sea
Y35 Wexford Rosslare


Eircode Routing Keys – all 139 of them
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40 thoughts on “Eircode Routing Keys – all 139 of them

  • July 14, 2015 at 9:20 pm

    Well done with compiling the list!
    One suggestion – T12 seems to cover Cork city centre as well as Mahon.
    It would be great to see a map of the codes. I started one based on An Post’s interactive map at
    However I’ve only got as far as the North East and don’t really have the time to complete it nationally:
    I guess they are trying to maximise their licence fee revenue by keeping as much info from the public domain…

  • July 20, 2015 at 9:46 pm

    Congrats on starting this. I don’t know why Eircode don’t just publish a map as one can be deduced through trial and error.

    Attempting to detect the boundaries, I have the following:

    Foster’s Avenue A94
    Deerpark Road Mount Merrion A94
    Mount Anville Road D14
    Roebuck Road D14
    Ardlui Park (top of Newtownpark Ave) A94
    Foxrock Park D18

  • July 21, 2015 at 12:37 pm

    Thanks Deryck, Andrew and John. Changes made.

    I notice that the Dublin postcode doesn’t always match the routing key. For example, Loughlinstown Hospital (St Columcille’s) has been assigned eircode D18 E365, yet its address is Co Dublin.

    The basic data linking eircodes with map co-ordinates should be freely available – as they are in the UK.

  • July 21, 2015 at 1:30 pm

    I did up some maps of the boundaries of the routing key areas near my home. This was easy when it turned out that each of these areas comprises a number of An Post publicity post districts. I checked a large sample of eircodes along the borders before trusting these maps.

    It would be nice to turn these boundary maps into vectors and upload them to OpenStreetMap.

  • July 24, 2015 at 3:10 pm

    Well done this should be available free of charge from the company. Many small enterprises would benefit by having it available. There also would be a better chance that it would be used if the rules were widely known

    IT Consultant

  • July 27, 2015 at 1:12 pm

    W23 is Naas/Straffan and maybe more…

  • August 1, 2015 at 2:40 pm

    Dear sir T12 is massive It goes to Inishannon and Fivemilebridge and Ballygarvan To the east of that is P43 Carrigaline to Crosshaven T12 includes Ballinhassig to Iniscarra and to Passage west and Monkstown P 43 is to the south The northern boundary of T12 is the north channel of the River Lee That means Cork city centre. T23 is the whole of Cork city north of the n channel of R Lee and extends from Blarney to Mayfield and to Kilully

  • August 1, 2015 at 2:49 pm

    Peter Matson again Idont think T12 goes to Iniscarra It may do. P 31 does Ovens is P 31 P12 joins T 23 to the west

  • August 1, 2015 at 7:06 pm

    Thanks Peter – only a matter of time before we have a full map of the boundaries

  • August 5, 2015 at 6:50 am

    The “V94” Routing Key area is huge: It includes Abbeyfeale and then a swathe through West Limerick, the southern shore of the estuary, the city, North-East Limerick, North West Tipperary, the eastern third of Clare and a small bit of South-East Galway near the R352 regional road. It must be the most popukous and probably one of the largest by area.

    However, Newcastle West, which lies between the “V94” towns of Abbeyfeale and Rathkeale has its own designation: “V42” as has Kilmallock and most of South-East Limerick: “V35”.

  • August 16, 2015 at 3:39 pm

    Searching for Routing Keys for the Irish Cities in ‘EBT’ I have collected a few Routing Keys. They are all in a spreadsheet.
    I’m now filling the map, but this is going one by one.
    Is there a faster way to enter the routing keys on the map?

    You can see the spreadsheet here

  • September 13, 2015 at 8:44 am

    Great work.
    Add Dunleer to A92 plz.

  • September 13, 2015 at 12:28 pm

    Dunleer added!

  • September 23, 2015 at 3:40 pm

    Rathmolyon is also A83 – thanks

  • October 3, 2015 at 11:32 am

    Thanks Rowan

  • January 26, 2016 at 9:05 am

    What’s the drill for submitting additions? I see the edit option, but backed off lest I make a mess of it.
    R35 for Walsh Island, Co. Offaly.

  • January 26, 2016 at 9:22 am

    Thanks Paul, I’ve added it in now.


  • May 13, 2016 at 4:43 pm

    The is also a Crookstown in R14 near Athy, Co. Kildare as well as the one listed above in P14, Co Cork.
    P14 & R14, P32 & R32, P51 & R51, P56 & R56 ??? Do you reckon this near duplication of easily mistaken letter/number combinations was down to some numpty not thinking?

  • August 14, 2016 at 1:02 am

    E41 goes out to Mullinahone, too.

  • November 24, 2016 at 10:34 am

    Hi, it looks like googlemaps have all the Eircodes loaded now.

    Rgds Frank

  • February 5, 2017 at 12:12 am

    Added Curraglass Castlecor to P51, Should be able to draw lines between points now 🙂 its likely will show areas that need refining because of overlap and area’s that are unknown and not mapped

  • April 7, 2017 at 1:50 pm

    I live near Listowe Co Kerry Code Area V31.
    Kerry Co Co Water Division are looking for the Eircode for all households i our Water Group Scheme, but I can get only 15 a day from the autu Eircode finder. Is there any place that I cn get a listing, I need about 150.

  • April 7, 2017 at 1:53 pm

    If you search for them in your browser using ‘incognito mode’ you can restart your browser every 15 searches and you will get another 15.

  • April 26, 2017 at 2:44 pm

    Jerry Mason
    You get another 15 when you use another browser (i.e. Internet Explorer, Mozilla, Chrome, etc.)

  • November 15, 2017 at 4:39 pm

    A82 includes Oldcastle

  • December 3, 2017 at 8:33 pm

    Sir and or Madam:
    A big HOWDY from Texas (Corsicana 50 miles south of Dallas) !
    Am a retired public schoolteacher and have followed your Eircode postal development for a few years.
    To your knowledge, has anyone (or a government agency) placed an estimated population figure for each Routing Key area in your wonderful country ?
    Any information or assistance shall be most sincerely appreciated.
    As do many of my USA country men and women, I watch on my VCR or DVD the movie “The Quiet Man” (1952, John Wayne & Maureen O’Hara) annually every March – during the Saint Patricks Day Celebration.

  • December 4, 2017 at 12:25 pm

    Howdy to you
    When I get a chance, I ‘ll query the Eircode database to get you an answer. I believe that there will be a large variation around the average.
    There are about 4.77 million people in Ireland so the average population in 139 eircodes will be about 34,000
    As for “The Quiet Man”, that’s a classic film. The old cottage is in ruins but there are plans to restore it. The nearest farm house is at H91 FX03, which is on the Galway side of the Galway/Mayo border.
    You can see it in Google Maps here:


  • December 5, 2017 at 7:46 pm

    Dear Ossian:
    Thanks for your reply (over there…from across the pond).
    I think I’ve found a way to acquire the estimated population of each Routing Key…HOWEVER…it is quite laborious, most likely inaccurate and very time consuming.
    I’ll enlarger each Routing Key map and with a straight edge ruler I slowly scan each map vertically or horizontally…and then list every village and town on paper. I then go to my computer’s search engine to seek the most current population for each listed Routing Key population locale. Occasionally I’ll have difficulty obtaining small villages with non-listed populations (thus, the inaccuracy factor).
    Here’s an example of one Routing Key list (from 139) without populations added:

    P31…Ballincollig; Old Quarter; Srelane; Deelish; Classis; Farran; Aheria; Begley’s Forge; Tineel; Coolmakee; Carrignaveen; Coolatubrid; Carrignaveen; Coolatubrid; Kilcrea Hill; Knocknatrinane; Garryhesta; Scart; Ovens.

    So far it’s been an interesting adventure. Would sure be interesting to one day see an official government Census Bureau result of any or all of my inaccuracies.

    Thanks again your interest and/or any Routing Key assistance rendered.
    If you’ll send your snail mail address I would like to send you a big road map of the State of Texas.
    (Our local Texas Highway Department distributes maps free to occasional “walk-in’s” at their office.)

  • May 11, 2018 at 2:32 pm

    Appreciate the google maps link. Are anpost using the eircodes yet?

  • May 14, 2018 at 8:19 pm

    Hi Broe
    Eircodes are used by An Post in their automatic sorting machines. Manual sorting does not use eircodes because eircode usage is so low (<5% of letters have eircodes). Even amongst government agencies, Eircode use is still very patchy. For example, new driver licences do not include Eircodes in their addresses even where applicants specifically include them.

  • August 17, 2018 at 10:01 am

    my Eircode does not match. it refers to a bungalow opposite my house .

  • August 21, 2018 at 10:15 pm

    Has anyone managed to get their hands on an interactive map to show all Eircode yet?

  • August 29, 2018 at 9:22 am

    Just wondering if there is a way to break down the Unique Identifier for each Routing Key to get townlands, villages, towns, etc

  • September 19, 2018 at 7:58 am

    Hi there
    If you use the ECAD database, you can map from individual Eircodes to townlands, villages towns etc.

  • September 22, 2019 at 10:26 pm

    Dublin got to keep D1, D2 etc. Us poor culchies got shafted again!

  • November 29, 2021 at 7:35 pm

    Hi Ossian,

    I thought you might be interested to take a look at a map I have created, showing the Eircode Routing Key regions. I made this as a fun graphic that small businesses might use to show the spread of their sales across Ireland. The map can be downloaded and printed as A3 and A4 and each region coloured in as the sales occur. It’s a simple idea but I must stress that the map is for illustrative purposes only and does not represent official boundaries in use by Eircode or An Post.

    I found your post interesting Ossian, so I’d be happy to give you a code to use to allow you to download the map for your own use if you would like to check it out. Please let me know.

    Here’s the link for the map

    Kind regards
    Tina Costigan
    GFX Design Studio

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