| Postcode | DT5 1BD | 
|---|---|
| Post Town | Portland | 
| Nearest station | Weymouth (5 km) | 
| Bus stops | Portland Castle (W) Portland Hospital (S) Verne Common Road (S) | 
| Roads in this postcode | |
| Number of UPRNs | 113 View | 
| Known addresses | Barbary House, Castletown, Portland Customs House, Castletown, Portland Flat 2, 9 Castletown, Portland Flat 3, 9 Castletown, Portland Flat 4, 9 Castletown, Portland Portland Roads Hotel, Castletown, Portland The Coach House, Castletown, Portland The Royal Breakwater Hotel, Castletown, Portland 6 Castletown, Portland 7A Castletown, Portland 9A Castletown, Portland 9B Castletown, Portland 12 Castletown, Portland 14 Castletown, Portland 15B Castletown, Portland 22 Castletown, Portland 23 Castletown, Portland 25 Castletown, Portland | 
| Main property type | Flat | 
| Businesses |  | 
| Latitude | 50.568106 | |
|---|---|---|
| Longitude | -2.442666 | |
| Easting | 368746 | |
| Northing | 74356 | |
| Grid reference | SY687743 | |
| UTM reference | 30U 539469 5601946 | |
| what3words | glow.trials.swimsuits | |
| FixPhrase | crewless lustily stardom timid | |
| Plus code | 9C2VHH94+6W | |
| Altitude | 10 metres (33 feet) | |
| Sunrise (today) | 7:00 | |
| Sunset (today) | 16:48 | |
| Distance away | ||
| Distance to sea | 0 KMs (0 miles) | 
| Parish | Portland | E04003630 | 
|---|---|---|
| Ward | Portland | E05012709 | 
| Unitary Authority | Dorset | E06000059 | 
| County | Dorset | E10000009 | 
| Constituency (2024) | South Dorset | E14001485 | 
| MP | Lloyd Hatton | Labour | 
| Police force | Dorset | |
| Water company | Wessex Water | |
| NUTS/ITL 3 | Dorset | |
| NUTS/ITL 2 | North Somerset, Somerset and Dorset | |
| NUTS/ITL 1 | South West | |
| Country | England | E92000001 | 
| 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) | 60 | |
|---|---|---|
| Households (2011) | 28 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Larger rural Further from a major town or city | |
| Rural/urban (2011) | Rural town and fringe | |
| Built up area (2024) | Fortuneswell | E63013988 | 
| Census output area (2021) | E00183056 | |
| Census output area (2011) | 7C3 | |
| Lower layer super output area (2021) | Dorset 047B | E01020569 | 
| Lower layer super output area (2011) | Weymouth and Portland 008D | E01020569 | 
| Middle layer super output area (2021) | Underhill & The Grove | E02004288 | 
| Middle layer super output area (2011) | Underhill & The Grove | E02004288 | 
| Travel to work area | Dorchester and Weymouth | E30000046 | 
| Average property price in Dorchester | £319,189 | 
|---|---|
| Annual change | -1.5% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 22 Castletown, Portland | Terraced (freehold) | Jan 2025 | £242,910 | 
| Terraced (freehold) | Dec 2017 | £175,000 | |
| Terraced (freehold) | May 2017 | £166,000 | |
| Terraced (freehold) | Jun 2009 | £142,500 | |
| 9A Castletown, Portland | Flat (leasehold) | Jul 2022 | £80,000 | 
| Flat (leasehold) | Jan 2000 | £23,750 | |
| Customs House, Castletown, Portland | Detached (freehold) | Jan 2021 | £495,000 | 
| Other (freehold) | Aug 2017 | £457,500 | |
| 25 Castletown, Portland | Other (freehold) | Oct 2019 | £223,000 | 
| Semi-detached (freehold) | Aug 2006 | £250,000 | |
| Barbary House, Castletown, Portland | Detached (freehold) | Feb 2018 | £315,000 | 
| Detached (freehold) | Oct 2002 | £220,000 | |
| The Royal Breakwater Hotel, Castletown, Portland | Other (freehold) | Dec 2017 | £325,000 | 
| Detached (freehold) | Nov 1999 | £52,500 | |
| Detached (freehold) | Feb 1997 | £78,000 | |
| Portland Roads Hotel, Castletown, Portland | Other (freehold) | Aug 2017 | £420,000 | 
| 12 Castletown, Portland | Other (freehold) | May 2015 | £175,000 | 
| Terraced (freehold) | Mar 1997 | £113,000 | |
| 15B Castletown, Portland | Terraced (freehold) | Dec 2014 | £115,000 | 
| 14 Castletown, Portland | Terraced (freehold) | Feb 2013 | £165,000 | 
| Terraced (freehold) | Aug 1997 | £45,000 |