| Postcode | CF45 4YE | 
|---|---|
| Post Town | Mountain Ash | 
| Nearest station | Penrhiwceiber (1 km) | 
| Bus stops | Bryntirion (E) Pentwyn Avenue (SE) Tynte Hotel (W) Pentwyn Avenue (NW) Tynte Hotel (E) Pentwyn Bridge (SE) | 
| Roads in this postcode | |
| Number of UPRNs | 73 View | 
| Known addresses | 1 Pentwyn Avenue, Mountain Ash 3 Pentwyn Avenue, Mountain Ash 5 Pentwyn Avenue, Mountain Ash 7 Pentwyn Avenue, Mountain Ash 11 Pentwyn Avenue, Mountain Ash 13 Pentwyn Avenue, Mountain Ash 15 Pentwyn Avenue, Mountain Ash 17 Pentwyn Avenue, Mountain Ash 23 Pentwyn Avenue, Mountain Ash 25 Pentwyn Avenue, Mountain Ash 27 Pentwyn Avenue, Mountain Ash 29 Pentwyn Avenue, Mountain Ash 31 Pentwyn Avenue, Mountain Ash 33 Pentwyn Avenue, Mountain Ash 35 Pentwyn Avenue, Mountain Ash 37 Pentwyn Avenue, Mountain Ash 41 Pentwyn Avenue, Mountain Ash 43 Pentwyn Avenue, Mountain Ash 45 Pentwyn Avenue, Mountain Ash 49 Pentwyn Avenue, Mountain Ash 53 Pentwyn Avenue, Mountain Ash 55 Pentwyn Avenue, Mountain Ash 59 Pentwyn Avenue, Mountain Ash 63 Pentwyn Avenue, Mountain Ash 67 Pentwyn Avenue, Mountain Ash 75 Pentwyn Avenue, Mountain Ash 89 Pentwyn Avenue, Mountain Ash 91 Pentwyn Avenue, Mountain Ash 93 Pentwyn Avenue, Mountain Ash 95 Pentwyn Avenue, Mountain Ash 97 Pentwyn Avenue, Mountain Ash 99 Pentwyn Avenue, Mountain Ash 101 Pentwyn Avenue, Mountain Ash 103 Pentwyn Avenue, Mountain Ash 107 Pentwyn Avenue, Mountain Ash 109 Pentwyn Avenue, Mountain Ash 111 Pentwyn Avenue, Mountain Ash 113 Pentwyn Avenue, Mountain Ash 119 Pentwyn Avenue, Mountain Ash 121 Pentwyn Avenue, Mountain Ash 131 Pentwyn Avenue, Mountain Ash | 
| Main property type | Terraced | 
| Businesses | 
| Latitude | 51.661509 | |
|---|---|---|
| Longitude | -3.354514 | |
| Easting | 306408 | |
| Northing | 196728 | |
| Grid reference | ST064967 | |
| UTM reference | 30U 475479 5723450 | |
| what3words | jumped.life.vaulting | |
| FixPhrase | crinkle lung spouse unkind | |
| Plus code | 9C3RMJ6W+J5 | |
| Altitude | 131 metres (430 feet) | |
| Sunrise (today) | 7:04 | |
| Sunset (today) | 16:51 | |
| Distance away | ||
| Distance to sea | 25 KMs (15.5 miles) | 
| Parish | Abercynon | W04000678 | 
|---|---|---|
| Ward | Abercynon | W05001072 | 
| Unitary Authority | Rhondda Cynon Taf | W06000016 | 
| County | Mid Glamorgan | W11000005 | 
| Constituency (2024) | Pontypridd | W07000106 | 
| MP | Alex Davies-Jones | Labour | 
| Police force | South Wales | |
| Water company | Dwr Cymru Welsh Water | |
| NUTS/ITL 3 | Central Valleys and Bridgend | |
| NUTS/ITL 2 | South East 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) | 103 | |
|---|---|---|
| Households (2011) | 48 | |
| 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) | Rural town and fringe | |
| Built up area (2024) | Abercynon | W45001111 | 
| Census output area (2021) | W00006042 | |
| Census output area (2011) | 8B1 | |
| Lower layer super output area (2021) | Rhondda Cynon Taf 012B | W01001144 | 
| Lower layer super output area (2011) | Rhondda Cynon Taf 012B | W01001144 | 
| Middle layer super output area (2021) | Abercynon | W02000263 | 
| Middle layer super output area (2011) | Abercynon | W02000263 | 
| Travel to work area | Merthyr Tydfil | W22000029 | 
| Average property price in Cardiff | £221,509 | 
|---|---|
| Annual change | 2.2% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 41 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Jan 2024 | £70,000 | 
| Terraced (freehold) | Sep 2004 | £43,000 | |
| Terraced (freehold) | Mar 2003 | £16,000 | |
| Terraced (freehold) | Dec 2002 | £21,500 | |
| 103 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Oct 2023 | £65,000 | 
| Terraced (freehold) | Feb 2017 | £39,000 | |
| Terraced (freehold) | Jun 2007 | £40,000 | |
| 101 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Aug 2023 | £79,000 | 
| Terraced (freehold) | Sep 2021 | £72,000 | |
| Terraced (freehold) | Feb 2016 | £52,000 | |
| Terraced (freehold) | Feb 2014 | £25,500 | |
| Terraced (freehold) | Nov 2010 | £32,000 | |
| Terraced (freehold) | Dec 2009 | £26,000 | |
| Terraced (freehold) | Oct 2008 | £38,000 | |
| Terraced (freehold) | Oct 2003 | £23,500 | |
| 59 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Jun 2023 | £165,000 | 
| Terraced (freehold) | Jun 2020 | £42,500 | |
| 131 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Mar 2023 | £90,000 | 
| Terraced (freehold) | Nov 2004 | £44,950 | |
| 55 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Dec 2022 | £35,000 | 
| Flat (leasehold) | Aug 2019 | £25,500 | |
| Flat (leasehold) | Jun 2012 | £27,000 | |
| 31 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Sep 2021 | £36,000 | 
| Terraced (freehold) | Jun 2005 | £42,000 | |
| 75 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Aug 2021 | £75,000 | 
| 17 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Jun 2021 | £60,000 | 
| 119 Pentwyn Avenue, Mountain Ash | Terraced (freehold) | Jan 2021 | £50,250 | 
| Terraced (freehold) | Nov 2019 | £27,500 | |
| Terraced (freehold) | Nov 2007 | £60,000 |