LL57 3LZ
Tre-garth a Mynydd Llandygái · Gwynedd · Wales
Updated September 2026
Compare this postcodeLocation overview
- Local authority
- Gwynedd
- Constituency
- Bangor Aberconwy
- Postcode district
- LL57
- Postcode sector
- LL57 3
Nearby postcodes
Complete postcode fields and official codes
- Postcode
- LL57 3LZ
- Status
- Current
- Introduced
- 1 January 1980
- Terminated
- Not published
- Postcode area
- LL
- Postcode district
- LL57
- Postcode sector
- LL57 3
- Latitude
- 53.123302
- Longitude
- -4.020493
- British National Grid easting
- 264,892
- British National Grid northing
- 360,365
Statistical and administrative geographies
- Country
- Wales · W92000004
- Region
- W99999999
- Local authority district
- Gwynedd · W06000002
- Electoral ward
- Tre-garth a Mynydd Llandygái · W05001563
- Parish or community
- W04000073
- Westminster constituency
- Bangor Aberconwy · W07000083
- Output area
- W00000599
- Lower layer super output area
- Gwynedd 003E · W01000115
- Middle layer super output area
- Gwynedd 003 · W02000012
Postcode source versions
- Ordnance Survey: Code-Point Open Version 2026-08 · Current postcode units in Great Britain · OGL-3.0
- Office for National Statistics: ONS Postcode Directory Version 2026-08 · United Kingdom; Northern Ireland excluded pending rights review; Crown Dependencies outside product scope · OGL-3.0 with third-party rights
- Ordnance Survey: Boundary-Line Version 2026-05 · Local-authority boundaries in Great Britain · OS OpenData Licence
Explore LL57
Census 2021
Population and age profile
- Postcode residents
- 7
- Postcode households
- 3
- Residents per household
- 2.3
- LL57 3 residents
- 5,563
3 female, 4 male
Age bands in LL57 3
Wider postcode sector- Age 0 to 14
- 17.8%
- Age 15 to 24
- 11.3%
- Age 25 to 44
- 25%
- Age 45 to 64
- 28.2%
- Age 65 and over
- 17.8%
989 residents
627 residents
1,390 residents
1,570 residents
989 residents
This postcode contained 0.1% of the sector's usual residents on Census Day. The age profile describes the wider LL57 3 sector, not people in this individual postcode.
Small counts are adjusted for privacy, so totals can differ slightly between Census tables.
Census Day: 21 March 2021. Sources: ONS/Nomis P001-P004 and ONS CT21_0228. Age table version 2024-04-08.
Fixed broadband coverage
Ofcom's predicted availability across all residential and commercial premises in this postcode in January 2026.
- Superfast, 30 Mbit/s+
- 0%
- Ultrafast, 100 Mbit/s+
- 0%
- Ultrafast, 300 Mbit/s+
- 0%
- Gigabit-capable
- 0%
- Unable to receive decent fixed or FWA broadband
- 0%
- Next Generation Access
- 100%
- Decent broadband available from fixed wireless
- 0%
Predicted coverage, not measured speeds. Check availability for your address with a provider. Postcode-level full-fibre figures are not published in this release.
Source: Ofcom Connected Nations Spring 2026, version 2026-01-v2. Contains Ofcom data licensed under the Open Government Licence v3.0.
Nearby transport
- 0.1 miles
Ogwen Cottage
BCT · Pont Pen-Y-Benglog
- 0.1 miles
Llyn Ogwen
BCT · Pont Pen-Y-Benglog
- 2.2 miles
Gwern Gof Isaf
BCT · Capel Curig
- 2.2 miles
Gwern Gôf Isaf
BCT · Capel Curig
- 2.6 miles
Pont Gromlech
BCT · Gwastadnant