| Postcode | CF46 6HT | 
|---|---|
| Post Town | Treharris | 
| Nearest station | Quakers Yard (2 km) | 
| Bus stops | Llancaiach View (SE) Star Club (SE) Star Club (NW) Bryncelyn Junction (E) Bryncelyn Junction (W) Police Houses (N) | 
| Roads in this postcode | |
| Number of UPRNs | 57 View | 
| Known addresses | 3 Lon Y Celyn, Nelson 4 Lon Y Celyn, Nelson 6 Lon Y Celyn, Nelson 8 Lon Y Celyn, Nelson 10 Lon Y Celyn, Nelson 11 Lon Y Celyn, Nelson 14 Lon Y Celyn, Nelson 14A Lon Y Celyn, Nelson 15 Lon Y Celyn, Nelson 16 Lon Y Celyn, Nelson 17 Lon Y Celyn, Nelson 18 Lon Y Celyn, Nelson 19 Lon Y Celyn, Nelson 21 Lon Y Celyn, Nelson 23 Lon Y Celyn, Nelson 25 Lon Y Celyn, Nelson 27 Lon Y Celyn, Nelson 33 Lon Y Celyn, Nelson 35 Lon Y Celyn, Nelson 41 Lon Y Celyn, Nelson 43 Lon Y Celyn, Nelson 47 Lon Y Celyn, Nelson 49 Lon Y Celyn, Nelson 51 Lon Y Celyn, Nelson 53 Lon Y Celyn, Nelson 57 Lon Y Celyn, Nelson 59 Lon Y Celyn, Nelson 61 Lon Y Celyn, Nelson 63 Lon Y Celyn, Nelson 65 Lon Y Celyn, Nelson 67 Lon Y Celyn, Nelson 73 Lon Y Celyn, Nelson 75 Lon Y Celyn, Nelson 77 Lon Y Celyn, Nelson | 
| Main property type | Semi-detached | 
| Businesses | 
| Latitude | 51.654163 | |
|---|---|---|
| Longitude | -3.289778 | |
| Easting | 310871 | |
| Northing | 195830 | |
| Grid reference | ST108958 | |
| UTM reference | 30U 479953 5722614 | |
| what3words | flicks.brink.readers | |
| FixPhrase | crinkle lurch spectacle trading | |
| Plus code | 9C3RMP36+M3 | |
| Altitude | 158 metres (519 feet) | |
| Sunrise (today) | 7:06 | |
| Sunset (today) | 16:49 | |
| Distance away | ||
| Distance to sea | 21.7 KMs (13.5 miles) | 
| Parish | Nelson | W04000739 | 
|---|---|---|
| Ward | Nelson | W05001665 | 
| Unitary Authority | Caerphilly | W06000018 | 
| County | Gwent | W11000003 | 
| Constituency (2024) | Caerphilly | W07000088 | 
| MP | Chris Evans | Labour | 
| Police force | Gwent | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | Gwent Valleys | |
| NUTS/ITL 2 | South East Wales | |
| NUTS/ITL 1 | Wales | |
| Country | Wales | W92000004 | 
| Date introduced | June 1981 | 
|---|---|
| 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) | 86 | |
|---|---|---|
| Households (2011) | 50 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Urban: Nearer to a major town or city | |
| Rural/urban (2011) | Urban city and town | |
| Built up area (2024) | Nelson (Caerphilly) | W45001116 | 
| Census output area (2021) | W00007224 | |
| Census output area (2011) | 6B3 | |
| Lower layer super output area (2021) | Caerphilly 013C | W01001379 | 
| Lower layer super output area (2011) | Caerphilly 013C | W01001379 | 
| Middle layer super output area (2021) | Ystrad Mynach & Nelson | W02000302 | 
| Middle layer super output area (2011) | Ystrad Mynach & Nelson | W02000302 | 
| Travel to work area | Cardiff | W22000024 | 
| Average property price in Cardiff | £221,509 | 
|---|---|
| Annual change | 2.2% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 47 Lon Y Celyn, Nelson | Semi-detached (freehold) | May 2024 | £195,000 | 
| Semi-detached (leasehold) | Jun 1996 | £50,000 | |
| 21 Lon Y Celyn, Nelson | Semi-detached (freehold) | Apr 2024 | £185,000 | 
| Semi-detached (freehold) | Sep 2014 | £95,000 | |
| 27 Lon Y Celyn, Nelson | Semi-detached (freehold) | Mar 2023 | £170,000 | 
| Semi-detached (leasehold) | Jul 2001 | £68,000 | |
| Semi-detached (leasehold) | Jun 1998 | £47,995 | |
| 17 Lon Y Celyn, Nelson | Detached (freehold) | Jan 2023 | £200,000 | 
| 43 Lon Y Celyn, Nelson | Semi-detached (freehold) | Nov 2022 | £210,000 | 
| Semi-detached (leasehold) | Apr 2022 | £158,500 | |
| Semi-detached (leasehold) | Dec 2003 | £85,950 | |
| 23 Lon Y Celyn, Nelson | Semi-detached (freehold) | Aug 2022 | £165,000 | 
| 16 Lon Y Celyn, Nelson | Semi-detached (freehold) | Feb 2022 | £175,000 | 
| Semi-detached (freehold) | Jan 2000 | £57,500 | |
| Semi-detached (leasehold) | Jan 2000 | £57,500 | |
| 65 Lon Y Celyn, Nelson | Semi-detached (freehold) | Oct 2021 | £160,000 | 
| Semi-detached (freehold) | May 2009 | £117,500 | |
| 59 Lon Y Celyn, Nelson | Semi-detached (freehold) | Sep 2021 | £165,000 | 
| Semi-detached (freehold) | Jun 2004 | £109,000 | |
| Semi-detached (leasehold) | Jun 2004 | £109,000 | |
| Semi-detached (leasehold) | Jul 2000 | £59,950 | |
| 10 Lon Y Celyn, Nelson | Semi-detached (freehold) | Dec 2018 | £139,950 |