| Postcode | AL3 8HN | 
|---|---|
| Post Town | St. Albans | 
| Nearest station | Harpenden (6 km) | 
| Bus stops | No nearby bus stops | 
| Roads in this postcode | |
| Number of UPRNs | 5 View | 
| Known addresses | Old River Hall, Old Watling Street, Flamstead River Hall Cottage, Old Watling Street, Flamstead River Hall, Old Watling Street, Flamstead River View, Old Watling Street, Flamstead | 
| Main property type | Detached | 
| Businesses | 
                        No businesses found
                     | 
| Latitude | 51.825837 | |
|---|---|---|
| Longitude | -0.433066 | |
| Easting | 508085 | |
| Northing | 215296 | |
| Grid reference | TL080152 | |
| UTM reference | 30U 676890 5744783 | |
| what3words | cabin.stole.vote | |
| FixPhrase | crisped magical shortcake vendetta | |
| Plus code | 9C3XRHG8+8Q | |
| Altitude | 131 metres (430 feet) | |
| Sunrise (today) | 6:55 | |
| Sunset (today) | 16:37 | |
| Distance away | ||
| Distance to sea | 70.8 KMs (44 miles) | 
| Parish | Flamstead | E04004700 | 
|---|---|---|
| Ward | Watling | E05004714 | 
| Local Authority District | Dacorum | E07000096 | 
| County Electoral Division | Bridgewater | E58000610 | 
| Local Authority | Hertfordshire | E10000015 | 
| County | Hertfordshire | E10000015 | 
| Constituency (2024) | Harpenden and Berkhamsted | E14001268 | 
| MP | Victoria Collins | Liberal Democrat | 
| Police force | Hertfordshire | |
| Water company | Affinity Water | |
| Sewage company | Thames Water | |
| NUTS/ITL 3 | South West Hertfordshire | |
| NUTS/ITL 2 | Bedfordshire and Hertfordshire | |
| NUTS/ITL 1 | East of England | |
| 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) | 10 | |
|---|---|---|
| Households (2011) | 4 | |
| Index of Multiple Deprivation (2019) | Most deprivedLeast deprived | |
| Average household income (2020) | Lowest (£22,200)
                        Highest (£108,100)
                       | |
| Rural/urban (2021) | Smaller rural: Nearer to a major town or city | |
| Rural/urban (2011) | Rural hamlet and isolated dwellings | |
| Built up area (2024) | Friar's Wash | E63011432 | 
| Census output area (2021) | E00119021 | |
| Census output area (2011) | 1B2 | |
| Lower layer super output area (2021) | Dacorum 001A | E01023430 | 
| Lower layer super output area (2011) | Dacorum 001A | E01023430 | 
| Middle layer super output area (2021) | Markyate, Flamstead & Gaddesden | E02004856 | 
| Middle layer super output area (2011) | Markyate, Flamstead & Gaddesden | E02004856 | 
| Travel to work area | Luton | E30000237 | 
| Average property price in St Albans | £541,094 | 
|---|---|
| Annual change | -0.5% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| River View, Old Watling Street, Flamstead | Detached (freehold) | Mar 2025 | £687,500 | 
| River Hall Cottage, Old Watling Street, Flamstead | Detached (freehold) | Jan 2025 | £550,000 | 
| Old River Hall, Old Watling Street, Flamstead | Detached (freehold) | Apr 2019 | £715,000 | 
| Detached (freehold) | May 2009 | £495,000 | |
| Detached (freehold) | Jul 2005 | £499,950 | |
| Detached (freehold) | Jun 2000 | £350,000 | |
| River Hall, Old Watling Street, Flamstead | Semi-detached (freehold) | Dec 1995 | £220,000 |