KA postcode district map, Kilmarnock
Supplier statuses last checked .
The KA postcode area covers 30 districts and 11,797 live postcodes, from KA1 to KA30. It is centred on Ayr and also covers Stewarton, Kilmarnock, Cumnock, Irvine and Kilwinning.
Districts here average 393 postcodes.
Where the KA districts sit
10 districts are plotted without a label where labels would overlap; every one is in the table below.
Where KA sits
It falls across North Ayrshire, South Ayrshire and East Ayrshire.
Every KA postcode is in Scotland. Water there is regulated by the Scottish Environment Protection Agency, and Temporary Use Bans under the Water Industry Act 1991 do not apply in Scotland at all.
Water supply across KA
All 30 KA districts are supplied by Scottish Water, which is notable at this size: an area with this many districts usually crosses at least one supply boundary, and this one does not.
We are re-checking Scottish Water's status. It was last confirmed on 17 August 2026 as no restrictions, and until it is confirmed again this page does not assert a current position for it.
The shape of the KA area
KA3 is the largest district with 1,193 postcodes around Stewarton, and KA14 the smallest with 37. The area divides into 80 postcode sectors.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: KA13, KA14, KA24 and KA25 all point at Kilwinning, KA6, KA7 and KA8 all point at Ayr and KA1 and KA2 all point at Kilmarnock.
What borders KA
KA sits next to G (Glasgow) to the north east, ML (Motherwell) to the east, DG (Dumfries) to the south east, PA (Paisley) to the north west and FK (Falkirk) to the north east.
Its neighbours run in 4 different directions, so KA is landlocked by other postcode areas on most sides.
KA districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| KA1 | Kilmarnock | Scottish Water | Check with your supplier |
| KA2 | Kilmarnock | Scottish Water | Check with your supplier |
| KA3 | Stewarton | Scottish Water | Check with your supplier |
| KA4 | Galston | Scottish Water | Check with your supplier |
| KA5 | Cumnock | Scottish Water | Check with your supplier |
| KA6 | Ayr | Scottish Water | Check with your supplier |
| KA7 | Ayr | Scottish Water | Check with your supplier |
| KA8 | Ayr | Scottish Water | Check with your supplier |
| KA9 | Prestwick | Scottish Water | Check with your supplier |
| KA10 | Troon | Scottish Water | Check with your supplier |
| KA11 | Irvine | Scottish Water | Check with your supplier |
| KA12 | Irvine | Scottish Water | Check with your supplier |
| KA13 | Kilwinning | Scottish Water | Check with your supplier |
| KA14 | Kilwinning | Scottish Water | Check with your supplier |
| KA15 | Stewarton | Scottish Water | Check with your supplier |
| KA16 | Newmilns | Scottish Water | Check with your supplier |
| KA17 | Darvel | Scottish Water | Check with your supplier |
| KA18 | Cumnock | Scottish Water | Check with your supplier |
| KA19 | Maybole | Scottish Water | Check with your supplier |
| KA20 | Stevenston | Scottish Water | Check with your supplier |
| KA21 | Saltcoats | Scottish Water | Check with your supplier |
| KA22 | Ardrossan | Scottish Water | Check with your supplier |
| KA23 | Ardrossan | Scottish Water | Check with your supplier |
| KA24 | Kilwinning | Scottish Water | Check with your supplier |
| KA25 | Kilwinning | Scottish Water | Check with your supplier |
| KA26 | Girvan | Scottish Water | Check with your supplier |
| KA27 | Auchencairn | Scottish Water | Check with your supplier |
| KA28 | Millport | Scottish Water | Check with your supplier |
| KA29 | Largs | Scottish Water | Check with your supplier |
| KA30 | Largs | Scottish Water | Check with your supplier |
Principal settlement is the town or city each district sits in or nearest to, derived from OS Open Names. It is not the Royal Mail post town, which is licensed data and not published openly. Status is resolved live from each company’s own notice.
Water hardness in KA
No water company covering KA publishes hardness figures as open data. The gap is named per district below so you know who to ask.
| District | Hardness | As published | Supply zone | Published by |
|---|---|---|---|---|
| KA1 | Not published by Scottish Water. Check with your supplier. | |||
| KA2 | Not published by Scottish Water. Check with your supplier. | |||
| KA3 | Not published by Scottish Water. Check with your supplier. | |||
| KA4 | Not published by Scottish Water. Check with your supplier. | |||
| KA5 | Not published by Scottish Water. Check with your supplier. | |||
| KA6 | Not published by Scottish Water. Check with your supplier. | |||
| KA7 | Not published by Scottish Water. Check with your supplier. | |||
| KA8 | Not published by Scottish Water. Check with your supplier. | |||
| KA9 | Not published by Scottish Water. Check with your supplier. | |||
| KA10 | Not published by Scottish Water. Check with your supplier. | |||
| KA11 | Not published by Scottish Water. Check with your supplier. | |||
| KA12 | Not published by Scottish Water. Check with your supplier. | |||
| KA13 | Not published by Scottish Water. Check with your supplier. | |||
| KA14 | Not published by Scottish Water. Check with your supplier. | |||
| KA15 | Not published by Scottish Water. Check with your supplier. | |||
| KA16 | Not published by Scottish Water. Check with your supplier. | |||
| KA17 | Not published by Scottish Water. Check with your supplier. | |||
| KA18 | Not published by Scottish Water. Check with your supplier. | |||
| KA19 | Not published by Scottish Water. Check with your supplier. | |||
| KA20 | Not published by Scottish Water. Check with your supplier. | |||
| KA21 | Not published by Scottish Water. Check with your supplier. | |||
| KA22 | Not published by Scottish Water. Check with your supplier. | |||
| KA23 | Not published by Scottish Water. Check with your supplier. | |||
| KA24 | Not published by Scottish Water. Check with your supplier. | |||
| KA25 | Not published by Scottish Water. Check with your supplier. | |||
| KA26 | Not published by Scottish Water. Check with your supplier. | |||
| KA27 | Not published by Scottish Water. Check with your supplier. | |||
| KA28 | Not published by Scottish Water. Check with your supplier. | |||
| KA29 | Not published by Scottish Water. Check with your supplier. | |||
| KA30 | Not published by Scottish Water. Check with your supplier. | |||
Hardness is published per census area, not per postcode, so these figures characterise a district rather than measuring one address. They are a scale and taste matter, not a safety one. Hardness data version wessex-water@2022-2025+yorkshire-water@2026.
Download the KA data
No signup, no email wall. GeoJSON carries the district points, the supplier and the live status, so it can be dropped straight into a map.
District positions are averaged postcode centroids from OS Code-Point Open. They show roughly where a district sits, not where its boundary runs, and are not legal boundaries.
Frequently asked questions
How many postcode districts are in the KA area?
There are 30 KA postcode districts, running from KA1 to KA30, and they contain 11,797 live postcodes across 80 sectors.
What towns does the KA postcode area cover?
KA covers Ayr, Stewarton, Kilmarnock, Cumnock, Irvine and Kilwinning. The area takes its name from Ayr, and each district is listed with its settlement in the table on this page.
Which water company supplies KA postcodes?
Scottish Water supplies all 30 KA districts. Supply boundaries follow the pipe network rather than postcode geography, so confirm against your water bill if you are near the edge of the area.
Why do KA13 and KA14 both say Kilwinning?
KA13, KA14, KA24 and KA25 all serve Kilwinning, covering different parts of it. A single town routinely needs more than one postcode district once it passes a few thousand delivery points, so this is normal rather than an error in an address.
Can I download a free KA postcode map?
Yes. This page offers the KA districts as GeoJSON, CSV and SVG, free and with no signup or email address required. The GeoJSON carries each district's position, its water company and its current restriction status, so it can be dropped straight into a mapping tool.
Why is the KA area called Kilmarnock when it covers Stewarton?
KA takes its letters from Kilmarnock, where the sorting office that served the area was based when the code was allocated. Stewarton is the largest settlement in the area today, in KA3, but the area code follows the historic sorting geography rather than current population.
Which councils cover the KA postcode area?
KA reaches into North Ayrshire, South Ayrshire and East Ayrshire. A postcode area is not a council area: they were drawn for different purposes and a single district can sit across a council boundary, so your postcode does not tell you which authority you pay.