| Postcode | LL65 4SS | 
|---|---|
| Post Town | Holyhead | 
| Nearest station | Ty Croes (5 km) | 
| Bus stops | 
                       Clock (SE) 
                     | 
                  
| Number of UPRNs | 6 View | 
| Known addresses | 
                       Pandy Newydd, Gwalchmai 
                            Pant Y Felin, Gwalchmai 
                            Trefin, Gwalchmai 
                            Ty Dwr, Gwalchmai 
                       | 
                  
| Main property type | Detached | 
| Businesses | 
                     
                        No businesses found
                     
                   | 
                
| Latitude | 53.256193 | |
|---|---|---|
| Longitude | -4.420846 | |
| Easting | 238606 | |
| Northing | 375978 | |
| Grid reference | SH386759 | |
| UTM reference | 30U 405214 5901712 | |
| what3words | invents.lemons.suspends | |
| FixPhrase | crouton luminance spinning trump | |
| Plus code | 9C5Q7H4H+FM | |
| Altitude | 51 metres (167 feet) | |
| Sunrise (today) | 7:22 | |
| Sunset (today) | 16:42 | |
| Distance away | ||
| Distance to sea | 7.4 KMs (4.6 miles) | 
| Parish | Trewalchmai | W04000039 | 
|---|---|---|
| Ward | Crigyll | W05001498 | 
| Unitary Authority | Isle of Anglesey | W06000001 | 
| County | Gwynedd | W11000004 | 
| Constituency (2024) | Ynys Môn | W07000112 | 
| MP | Llinos Medi | Plaid Cymru | 
| Police force | North Wales | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | Isle of Anglesey | |
| NUTS/ITL 2 | North Wales | |
| NUTS/ITL 1 | Wales | |
| Country | Wales | W92000004 | 
| Date introduced | January 1980 | 
|---|---|
| Last updated | September 2025 | 
| User type | Small (addresses receive less than 25 items of mail per day) | 
| Quality | Within the building of the matched address closest to the postcode mean | 
| Population (2011) | 11 | |
|---|---|---|
| Households (2011) | 5 | |
| Index of Multiple Deprivation (2019) | 
                     Most deprivedLeast deprived 
                   | 
                |
| Average household income (2020) | 
                       Lowest (£22,200)
                        Highest (£108,100)
                       
                     | 
                  |
| Rural/urban (2021) | Smaller rural: Further from a major town or city | |
| Rural/urban (2011) | Rural village in a sparse setting | |
| Built up area (2024) | Gwalchmai | W45000670 | 
| Census output area (2021) | W00000040 | |
| Census output area (2011) | 1A2 | |
| Lower layer super output area (2021) | Isle of Anglesey 007C | W01000009 | 
| Lower layer super output area (2011) | Isle of Anglesey 007C | W01000009 | 
| Middle layer super output area (2021) | Bodedern & Rhosneigr | W02000007 | 
| Middle layer super output area (2011) | Bodedern & Rhosneigr | W02000007 | 
| Travel to work area | Bangor and Holyhead | W22000022 | 
| Address | Type | Date | Price | 
|---|---|---|---|
| Pant Y Felin, Gwalchmai | Detached (freehold) | Mar 2017 | £275,000 | 
| Detached (freehold) | Mar 2002 | £88,000 | |
| Trefin, Gwalchmai | Detached (freehold) | Mar 2016 | £166,500 | 
| Detached (freehold) | May 2007 | £156,000 | |
| Ty Dwr, Gwalchmai | Detached (freehold) | Oct 2004 | £184,000 | 
| Detached (freehold) | Apr 2001 | £53,000 | |
| Pandy Newydd, Gwalchmai | Detached (freehold) | Jul 1997 | £67,500 |