# KA21

Postcode district covering Saltcoats, Mayfield and Auchenharvie, in North Ayrshire.

KA21 is a postcode district covering Saltcoats, Mayfield and Auchenharvie, in North Ayrshire. About 12,614 people.

Postcode district. Code KA21. In: [Postcodes](https://openindex.co.uk/postcode) › [KA](https://openindex.co.uk/postcode/ka)

Approximate outline worked out by Open Index from the ONS Postcode Directory: each census output area belongs to the district that holds most of its postcodes. People, homes, recorded crime and broadband add up those output areas. House sales count every sale with an KA21 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Population: 12,256** (2021). KA21 had 12,256 usual residents at the census (Scotland's Census 2022). 857th least populated of 2,756. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/postcode/ka21#f-population
- **People in radon Affected Area squares: 9%** (2022). About 9% of people in KA21 live in a 1 km square that the radon atlas marks as a radon Affected Area. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/postcode/ka21#f-radon-affected-share
- **Gigabit broadband coverage: 90.3%** (January 2026). In KA21, 90.3% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026. https://openindex.co.uk/postcode/ka21#f-gigabit-coverage
- **Claimant rate: 5.1%** (August 2026). In KA21, 5.1% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026 (ONS via Nomis). UK 3.9%. Source: Claimant count (Nomis), August 2026. Published 15 September 2026. https://openindex.co.uk/postcode/ka21#f-claimant-rate

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=KA21) (Worked out by Open Index · 2022): About 9% of people in KA21 live in a 1 km square that the radon atlas marks as a radon Affected Area.
- [Average house price by council](https://openindex.co.uk/map/house-prices?place=KA21) (UK House Price Index · August 2026): Published for whole councils, so the map colours all of North Ayrshire, where most of this postcode district lies. The outline is KA21.
- [Crimes by council](https://openindex.co.uk/map/scotland-crime-count?place=KA21) (Recorded crimes and offences in Scotland · 2025/26): Published for whole councils, so the map colours all of North Ayrshire, where most of this postcode district lies. The outline is KA21.
- [Population by postcode district](https://openindex.co.uk/map/population?place=KA21) (Census 2021, England and Wales): KA21 had 12,256 usual residents at the census.

## How KA21 compares

Each postcode district against every other postcode district the measure covers.

| Measure | KA21 | Rank | Compared with |
| --- | --- | --- | --- |
| Population | 12,256 | 12th most populated | 30 postcode districts, KA · 2021 |
| People in radon Affected Area squares | 9% | joint 13th most people in radon Affected Areas | 30 postcode districts, KA · 2022 |
| Gigabit broadband coverage | 90.3% | 9th highest | 30 postcode districts, KA · Jan 2026 |
| Claimant rate | 5.1% | joint 6th highest | 29 postcode districts, KA · Aug 2026 |

## What is the population of KA21?

KA21 had 12,256 usual residents at the census.
KA21 is the 857th least populated of 2,756 in the UK.

## Neighbourhoods in KA21

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Fairlie and Rural - 02](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018556) | 514 | – | – | 99.6% |
| [Saltcoats Central - 01](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018485) | 722 | – | – | 77.5% |
| [Saltcoats Central - 02](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018486) | 550 | – | – | 94.8% |
| [Saltcoats Central - 03](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018487) | 665 | – | – | 88.9% |
| [Saltcoats Central - 04](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018488) | 686 | – | – | 81.9% |
| [Saltcoats Central - 05](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018489) | 974 | – | – | 83.4% |
| [Saltcoats North East - 01](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018508) | 866 | – | – | 99.7% |
| [Saltcoats North East - 02](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018509) | 404 | – | – | 99.5% |
| [Saltcoats North East - 03](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018510) | 713 | – | – | 92.5% |
| [Saltcoats North East - 04](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018511) | 553 | – | – | 100.0% |
| [Saltcoats North East - 05](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018512) | 618 | – | – | 99.6% |
| [Saltcoats North East - 06](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018513) | 828 | – | – | 99.8% |
| [Saltcoats North East - 07](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018514) | 821 | – | – | 100.0% |
| [Saltcoats North West - 01](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018503) | 757 | – | – | 100.0% |
| [Saltcoats North West - 02](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018504) | 485 | – | – | 100.0% |
| [Saltcoats North West - 03](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018505) | 707 | – | – | 99.4% |
| [Saltcoats North West - 04](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018506) | 645 | – | – | 69.2% |
| [Saltcoats North West - 05](https://openindex.co.uk/north-ayrshire/neighbourhood/s01018507) | 659 | – | – | 97.4% |

## Your MP

- [North Ayrshire and Arran](https://openindex.co.uk/constituency/north-ayrshire-and-arran): Irene Campbell (Labour), MP since July 2024.

As of 18 October 2026. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

## Middle areas in KA21

[Saltcoats Central](https://openindex.co.uk/north-ayrshire/saltcoats-central), [Saltcoats North East](https://openindex.co.uk/north-ayrshire/saltcoats-north-east), [Saltcoats North West](https://openindex.co.uk/north-ayrshire/saltcoats-north-west)

## Postcode sectors in KA21

[KA21 5 (196 postcodes)](https://openindex.co.uk/postcode/ka21-5), [KA21 6 (174 postcodes)](https://openindex.co.uk/postcode/ka21-6), [KA21 9 (3 postcodes)](https://openindex.co.uk/postcode/ka21-9)

## Council

[North Ayrshire](https://openindex.co.uk/north-ayrshire)

## Towns in KA21

[Saltcoats](https://openindex.co.uk/town/saltcoats)

## Postcode districts next to KA21

[KA13](https://openindex.co.uk/postcode/ka13), [KA20](https://openindex.co.uk/postcode/ka20), [KA22](https://openindex.co.uk/postcode/ka22), [KA24](https://openindex.co.uk/postcode/ka24)

## Nearest rail stations

[Kilwinning (3.6 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-4.7100,55.6559), [Stevenston (4.1 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-4.7508,55.6343), [Ardrossan South Beach (4.1 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-4.8012,55.6414), [Saltcoats (4.4 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-4.7843,55.6339)

## More in the KA postcode area

[All KA postcode districts](https://openindex.co.uk/postcode/ka), [Every UK postcode area](https://openindex.co.uk/postcode)

## KA21 in brief

KA21 is a postcode district covering Saltcoats, Mayfield and Auchenharvie, in North Ayrshire.
About 12,614 people lived in KA21 in mid-2024 (worked out by Open Index from NRS small-area estimates).
KA21 had 12,256 usual residents at the census.
About 9% of people in KA21 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In KA21, 90.3% of homes and businesses could get gigabit-capable broadband in January 2026.
In KA21, 5.1% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026.

## About

- Type: Postcode district
- Code: KA21
- Postcode area: [KA](https://openindex.co.uk/postcode/ka)
- Constituency: [North Ayrshire and Arran †](https://openindex.co.uk/constituency/north-ayrshire-and-arran)
- Council: [North Ayrshire †](https://openindex.co.uk/north-ayrshire)
- Area: 16.33 km²
- People, mid-2024: 12,614*
- Neighbourhoods: 18
- Output areas: 107

* People: worked out by Open Index from neighbourhood estimates, shared out by where people lived at the census (by area in Northern Ireland). This area's edges do not follow neighbourhood edges, so the figure is close but not exact.
† Best fit: the constituency, council and nation this postcode district mostly lies in. Its edges do not follow theirs.

## Next door

[KA20](https://openindex.co.uk/postcode/ka20), [KA24](https://openindex.co.uk/postcode/ka24), [KA22](https://openindex.co.uk/postcode/ka22), [KA13](https://openindex.co.uk/postcode/ka13)

## Latest updates for KA21

- August 2026 house prices published: HM Land Registry and partners · Oct 2026.
- September 2026 rent published: ONS private rents · Oct 2026.
- Schools updated: Ofsted · Oct 2026.
- GP practices updated: NHS England · Oct 2026.

The same figures as JSON: https://openindex.co.uk/v1/places/KA21

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/ka21, or to one figure with its anchor, https://openindex.co.uk/postcode/ka21#f-population.

Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it.

Snapshot 2026.10.9. The HTML page: https://openindex.co.uk/postcode/ka21