# LL55

Postcode district covering Caernarfon and Llanberis, in Gwynedd.

LL55 is a postcode district covering Caernarfon and Llanberis, in Gwynedd. Median sale price £205,000 in 2025. Recorded crime 101.9 per 1,000 people.

Postcode district. Code LL55. In: [Postcodes](https://openindex.co.uk/postcode) › [LL](https://openindex.co.uk/postcode/ll)

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 LL55 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £205,000** (2025). The median price paid for a home in LL55 was £205,000 in 2025. Joint 421st 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/ll55#f-house-sales-median-price
- **Population: 21,746** (2021). LL55 had 21,746 usual residents at the census (ONS Census 2021). 1,355th 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/ll55#f-population
- **People in radon Affected Area squares: 89%** (2022). About 89% of people in LL55 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/ll55#f-radon-affected-share
- **Gigabit broadband coverage: 77.8%** (January 2026). In LL55, 77.8% 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/ll55#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas#place=LL55) (Worked out by Open Index · 2022): About 89% of people in LL55 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=LL55) (Worked out by Open Index · 2025): 267 homes were sold in LL55 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime#place=LL55) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for LL55.
- [Population by postcode district](https://openindex.co.uk/map/population#place=LL55) (Census 2021, England and Wales): LL55 had 21,746 usual residents at the census.

## How LL55 compares

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

| Measure | LL55 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £205,000 | joint 27th cheapest | 57 postcode districts, LL · 2025 |
| Population | 21,746 | 8th most populated | 66 postcode districts, LL · 2021 |
| People in radon Affected Area squares | 89% | 14th fewest people in radon Affected Areas | 66 postcode districts, LL · 2022 |
| Gigabit broadband coverage | 77.8% | 33rd lowest | 66 postcode districts, LL · Jan 2026 |

## Is LL55 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in LL55 at a rate of 101.9 per 1,000 people.
That compares with 97.5 per 1,000 people across the LL postcode area.
In August 2026 alone, 250 cases of crime and anti-social behaviour were recorded in LL55.
In the 12 months to August 2026, the most common types were violence and sexual offences (874), anti-social behaviour (453) and other crime (343).
A year earlier, the recorded crime rate in LL55 was 105.2 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 LL55, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so LL55 has no single figure. Of its 13 neighbourhoods with a rank:
- Decile 1 (Wales’s most deprived 10%): 1 neighbourhood
- Decile 3: 2 neighbourhoods
- Decile 4: 1 neighbourhood
- Decile 5: 1 neighbourhood
- Decile 6: 2 neighbourhoods
- Decile 7: 3 neighbourhoods
- Decile 8: 1 neighbourhood
- Decile 9: 2 neighbourhoods

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

## Neighbourhoods in LL55

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Gwynedd 004A](https://openindex.co.uk/gwynedd/neighbourhood/w01000052) | 1,090 | 46.6 per 1,000 | 8 | 98.4% |
| [Gwynedd 004B](https://openindex.co.uk/gwynedd/neighbourhood/w01000053) | 1,179 | 25.4 per 1,000 | 6 | 83.0% |
| [Gwynedd 004C](https://openindex.co.uk/gwynedd/neighbourhood/w01000087) | 1,825 | 48.5 per 1,000 | 9 | 95.9% |
| [Gwynedd 005A](https://openindex.co.uk/gwynedd/neighbourhood/w01000063) | 1,897 | 54.3 per 1,000 | 3 | 36.7% |
| [Gwynedd 005B](https://openindex.co.uk/gwynedd/neighbourhood/w01000081) | 2,009 | 86.5 per 1,000 | 7 | 56.0% |
| [Gwynedd 005C](https://openindex.co.uk/gwynedd/neighbourhood/w01000099) | 1,670 | 27.1 per 1,000 | 6 | 50.7% |
| [Gwynedd 006A](https://openindex.co.uk/gwynedd/neighbourhood/w01000059) | 2,114 | 181.6 per 1,000 | 3 | 93.5% |
| [Gwynedd 006B](https://openindex.co.uk/gwynedd/neighbourhood/w01000093) | 2,256 | 135.3 per 1,000 | 9 | 89.6% |
| [Gwynedd 006C](https://openindex.co.uk/gwynedd/neighbourhood/w01000098) | 2,548 | 146.1 per 1,000 | 1 | 98.6% |
| [Gwynedd 006D](https://openindex.co.uk/gwynedd/neighbourhood/w01000110) | 1,597 | 48.0 per 1,000 | 7 | 96.7% |
| [Gwynedd 007A](https://openindex.co.uk/gwynedd/neighbourhood/w01000054) | 1,003 | 20.9 per 1,000 | 7 | 86.7% |
| [Gwynedd 007C](https://openindex.co.uk/gwynedd/neighbourhood/w01000111) | 1,564 | 299.9 per 1,000 | 4 | 88.8% |
| [Gwynedd 007D](https://openindex.co.uk/gwynedd/neighbourhood/w01000118) | 1,710 | 48.8 per 1,000 | 5 | 42.1% |

## Your MP

- [Dwyfor Meirionnydd](https://openindex.co.uk/constituency/dwyfor-meirionnydd): Liz Saville Roberts (Plaid Cymru), 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 LL55

[Bethel & Llanrug](https://openindex.co.uk/gwynedd/bethel-and-llanrug), [Caernarfon East](https://openindex.co.uk/gwynedd/caernarfon-east), [Caernarfon West & Waunfawr](https://openindex.co.uk/gwynedd/caernarfon-west-and-waunfawr), [Llanberis & Deiniolen](https://openindex.co.uk/gwynedd/llanberis-and-deiniolen)

## Postcode sectors in LL55

[LL55 1 (175 postcodes)](https://openindex.co.uk/postcode/ll55-1), [LL55 2 (195 postcodes)](https://openindex.co.uk/postcode/ll55-2), [LL55 3 (123 postcodes)](https://openindex.co.uk/postcode/ll55-3), [LL55 4 (240 postcodes)](https://openindex.co.uk/postcode/ll55-4), [LL55 9 (8 postcodes)](https://openindex.co.uk/postcode/ll55-9)

## Council

[Gwynedd](https://openindex.co.uk/gwynedd)

## Towns in LL55

[Caernarfon](https://openindex.co.uk/town/caernarfon)

## Postcode districts next to LL55

[LL24](https://openindex.co.uk/postcode/ll24), [LL25](https://openindex.co.uk/postcode/ll25), [LL48](https://openindex.co.uk/postcode/ll48), [LL49](https://openindex.co.uk/postcode/ll49), [LL51](https://openindex.co.uk/postcode/ll51), [LL54](https://openindex.co.uk/postcode/ll54), [LL56](https://openindex.co.uk/postcode/ll56), [LL57](https://openindex.co.uk/postcode/ll57)

## More in the LL postcode area

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

## LL55 in brief

LL55 is a postcode district covering Caernarfon and Llanberis, in Gwynedd.
About 22,040 people lived in LL55 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £205,000 in 2025 across 267 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 101.9 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in LL55 was £205,000 in 2025.
LL55 had 21,746 usual residents at the census.
About 89% of people in LL55 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In LL55, 77.8% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: LL55
- Postcode area: [LL](https://openindex.co.uk/postcode/ll)
- Constituency: [Dwyfor Meirionnydd †](https://openindex.co.uk/constituency/dwyfor-meirionnydd)
- Council: [Gwynedd †](https://openindex.co.uk/gwynedd)
- Area: 212 km²
- People, mid-2024: 22,040*
- Neighbourhoods: 13
- Output areas: 75

* 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

[LL54](https://openindex.co.uk/postcode/ll54), [LL57](https://openindex.co.uk/postcode/ll57), [LL48](https://openindex.co.uk/postcode/ll48), [LL56](https://openindex.co.uk/postcode/ll56), [LL24](https://openindex.co.uk/postcode/ll24), [LL49](https://openindex.co.uk/postcode/ll49)

## Latest updates for LL55

- 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/LL55

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/ll55, or to one figure with its anchor, https://openindex.co.uk/postcode/ll55#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 2026.10.10. The HTML page: https://openindex.co.uk/postcode/ll55