# SY23

Postcode district covering Aberystwyth, in Ceredigion.

SY23 is a postcode district covering Aberystwyth, in Ceredigion. Median sale price £215,000 in 2025. Recorded crime 92.4 per 1,000 people. About 29,410 people.

Postcode district. Code SY23. In: [Postcodes](https://openindex.co.uk/postcode) › [SY](https://openindex.co.uk/postcode/sy)

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 SY23 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £215,000** (2025). The median price paid for a home in SY23 was £215,000 in 2025. Joint 482nd cheapest of 2,235. Source: Worked out by Open Index from HM Land Registry Price Paid Data. Published 28 September 2026. https://openindex.co.uk/postcode/sy23#f-house-sales-median-price
- **Population: 28,373** (2021). SY23 had 28,373 usual residents at the census (ONS Census 2021). 1,004th most 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/sy23#f-population
- **People in radon Affected Area squares: 99%** (2022). About 99% of people in SY23 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/sy23#f-radon-affected-share
- **Gigabit broadband coverage: 66.6%** (January 2026). In SY23, 66.6% 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/sy23#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=SY23) (Worked out by Open Index · 2022): About 99% of people in SY23 live in a 1 km square that the radon atlas marks as a radon Affected Area.
- [Sales per year by postcode district](https://openindex.co.uk/map/house-sales-per-year?place=SY23) (Worked out by Open Index · 2025): 304 homes were sold in SY23 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=SY23) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for SY23.
- [Population by postcode district](https://openindex.co.uk/map/population?place=SY23) (Census 2021, England and Wales): SY23 had 28,373 usual residents at the census.

## How SY23 compares

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

| Measure | SY23 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £215,000 | 5th cheapest | 25 postcode districts, SY · 2025 |
| Population | 28,373 | 3rd most populated | 25 postcode districts, SY · 2021 |
| People in radon Affected Area squares | 99% | 11th fewest people in radon Affected Areas | 25 postcode districts, SY · 2022 |
| Gigabit broadband coverage | 66.6% | 10th lowest | 25 postcode districts, SY · Jan 2026 |

## Is SY23 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in SY23 at a rate of 92.4 per 1,000 people.
That compares with 66.4 per 1,000 people across the SY postcode area.
In August 2026 alone, 215 cases of crime and anti-social behaviour were recorded in SY23.
In the 12 months to August 2026, the most common types were violence and sexual offences (1,038), anti-social behaviour (605) and other crime (441).
A year earlier, the recorded crime rate in SY23 was 88.8 per 1,000 people.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.

## Deprivation in SY23, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so SY23 has no single figure. Of its 18 neighbourhoods with a rank:
- Decile 3: 1 neighbourhood
- Decile 4: 4 neighbourhoods
- Decile 5: 4 neighbourhoods
- Decile 6: 1 neighbourhood
- Decile 7: 1 neighbourhood
- Decile 8: 2 neighbourhoods
- Decile 9: 4 neighbourhoods
- Decile 10 (Wales’s least deprived 10%): 1 neighbourhood

Source: Welsh Index of Multiple Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in Wales.

## Neighbourhoods in SY23

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Ceredigion 001E](https://openindex.co.uk/ceredigion/neighbourhood/w01000549) | 1,774 | 31.0 per 1,000 | 8 | 79.1% |
| [Ceredigion 002A](https://openindex.co.uk/ceredigion/neighbourhood/w01000512) | 1,355 | 96.6 per 1,000 | 9 | 73.4% |
| [Ceredigion 002B](https://openindex.co.uk/ceredigion/neighbourhood/w01000513) | 2,109 | 324.6 per 1,000 | 4 | 50.3% |
| [Ceredigion 002D](https://openindex.co.uk/ceredigion/neighbourhood/w01000517) | 1,172 | 262.8 per 1,000 | 4 | 65.2% |
| [Ceredigion 002G](https://openindex.co.uk/ceredigion/neighbourhood/w01002000) | 2,921 | 24.8 per 1,000 | 9 | 47.6% |
| [Ceredigion 002H](https://openindex.co.uk/ceredigion/neighbourhood/w01002001) | 1,415 | 103.2 per 1,000 | 7 | 64.5% |
| [Ceredigion 003A](https://openindex.co.uk/ceredigion/neighbourhood/w01000515) | 1,320 | 74.6 per 1,000 | 3 | 87.5% |
| [Ceredigion 003B](https://openindex.co.uk/ceredigion/neighbourhood/w01000516) | 1,643 | 67.5 per 1,000 | 4 | 94.8% |
| [Ceredigion 003C](https://openindex.co.uk/ceredigion/neighbourhood/w01000518) | 1,007 | 146.2 per 1,000 | 5 | 54.3% |
| [Ceredigion 003E](https://openindex.co.uk/ceredigion/neighbourhood/w01001935) | 1,036 | 104.7 per 1,000 | 9 | 84.7% |
| [Ceredigion 003F](https://openindex.co.uk/ceredigion/neighbourhood/w01001936) | 1,453 | 22.8 per 1,000 | 9 | 60.6% |
| [Ceredigion 005C](https://openindex.co.uk/ceredigion/neighbourhood/w01000538) | 1,544 | 28.3 per 1,000 | 5 | 76.3% |
| [Ceredigion 005D](https://openindex.co.uk/ceredigion/neighbourhood/w01000539) | 1,187 | 20.2 per 1,000 | 5 | 74.2% |
| [Ceredigion 005E](https://openindex.co.uk/ceredigion/neighbourhood/w01000540) | 1,155 | 67.9 per 1,000 | 5 | 68.3% |
| [Ceredigion 011A](https://openindex.co.uk/ceredigion/neighbourhood/w01000525) | 1,226 | 35.5 per 1,000 | 10 | 85.5% |
| [Ceredigion 011B](https://openindex.co.uk/ceredigion/neighbourhood/w01000534) | 1,518 | 35.2 per 1,000 | 8 | 75.0% |
| [Ceredigion 011C](https://openindex.co.uk/ceredigion/neighbourhood/w01000543) | 2,011 | 202.6 per 1,000 | 4 | 50.8% |
| [Ceredigion 011D](https://openindex.co.uk/ceredigion/neighbourhood/w01000552) | 2,008 | 28.7 per 1,000 | 6 | 74.4% |

## Your MP

- [Ceredigion Preseli](https://openindex.co.uk/constituency/ceredigion-preseli): Ben Lake (Plaid Cymru), MP since July 2024. 100% of the people here.
- [Brecon, Radnor and Cwm Tawe](https://openindex.co.uk/constituency/brecon-radnor-and-cwm-tawe): David Chadwick (Liberal Democrat), MP since July 2024. 0.1% of the people here.

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

## Middle areas in SY23

[Aberaeron & Llanrhystud](https://openindex.co.uk/ceredigion/aberaeron-and-llanrhystud), [Aberystwyth North](https://openindex.co.uk/ceredigion/aberystwyth-north), [Aberystwyth South](https://openindex.co.uk/ceredigion/aberystwyth-south), [Rheidol, Ystwyth & Caron](https://openindex.co.uk/ceredigion/rheidol-ystwyth-and-caron)

## Postcode sectors in SY23

[SY23 1 (190 postcodes)](https://openindex.co.uk/postcode/sy23-1), [SY23 2 (107 postcodes)](https://openindex.co.uk/postcode/sy23-2), [SY23 3 (303 postcodes)](https://openindex.co.uk/postcode/sy23-3), [SY23 4 (237 postcodes)](https://openindex.co.uk/postcode/sy23-4), [SY23 5 (140 postcodes)](https://openindex.co.uk/postcode/sy23-5), [SY23 9 (8 postcodes)](https://openindex.co.uk/postcode/sy23-9)

## Council

[Ceredigion](https://openindex.co.uk/ceredigion)

## Towns in SY23

[Aberystwyth](https://openindex.co.uk/town/aberystwyth)

## Postcode districts next to SY23

[SA46](https://openindex.co.uk/postcode/sa46), [SA48](https://openindex.co.uk/postcode/sa48), [SY18](https://openindex.co.uk/postcode/sy18), [SY19](https://openindex.co.uk/postcode/sy19), [SY20](https://openindex.co.uk/postcode/sy20), [SY24](https://openindex.co.uk/postcode/sy24), [SY25](https://openindex.co.uk/postcode/sy25)

## More in the SY postcode area

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

## SY23 in brief

SY23 is a postcode district covering Aberystwyth, in Ceredigion.
About 29,410 people lived in SY23 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £215,000 in 2025 across 304 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 92.4 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in SY23 was £215,000 in 2025.
SY23 had 28,373 usual residents at the census.
About 99% of people in SY23 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In SY23, 66.6% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: SY23
- Postcode area: [SY](https://openindex.co.uk/postcode/sy)
- Constituency: [Ceredigion Preseli †](https://openindex.co.uk/constituency/ceredigion-preseli)
- Council: [Ceredigion †](https://openindex.co.uk/ceredigion)
- Area: 493 km²
- People, mid-2024: 29,410*
- Neighbourhoods: 18
- Output areas: 94

* 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

[SY25](https://openindex.co.uk/postcode/sy25), [SY24](https://openindex.co.uk/postcode/sy24), [SY18](https://openindex.co.uk/postcode/sy18), [SA48](https://openindex.co.uk/postcode/sa48), [SA46](https://openindex.co.uk/postcode/sa46), [SY20](https://openindex.co.uk/postcode/sy20)

## Latest updates for SY23

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

The same figures as JSON: https://openindex.co.uk/v1/places/SY23

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/sy23, or to one figure with its anchor, https://openindex.co.uk/postcode/sy23#f-house-sales-median-price.

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/sy23