| Postcode | HP18 0SU | 
|---|---|
| Post Town | Aylesbury | 
| Nearest station | Bicester Village (9 km) | 
| Bus stops | 
                       Rumptons Paddock (SE) 
Combined School (NW) 
Combined School (SE) 
                     | 
                  
| Roads in this postcode | |
| Number of UPRNs | 11 View | 
| Known addresses | 
                       Manorside, Main Street, Grendon Underwood 
                            1 Old Farm Court, Main Street, Grendon Underwood 
                            3 Old Farm Court, Main Street, Grendon Underwood 
                       | 
                  
| Main property type | Detached | 
| Businesses | 
| Latitude | 51.883024 | |
|---|---|---|
| Longitude | -1.016344 | |
| Easting | 467802 | |
| Northing | 220953 | |
| Grid reference | SP678209 | |
| UTM reference | 30U 636527 5749887 | |
| what3words | gazes.kicked.alarm | |
| FixPhrase | crisped mace stubbly tackiness | |
| Plus code | 9C3WVXMM+6F | |
| Altitude | 74 metres (243 feet) | |
| Sunrise (today) | 7:05 | |
| Sunset (today) | 16:32 | |
| Distance away | ||
| Distance to sea | 109.3 KMs (67.9 miles) | 
| Parish | Grendon Underwood | E04001489 | 
|---|---|---|
| Ward | Grendon Underwood & The Claydons | E05015953 | 
| Unitary Authority | Buckinghamshire | E06000060 | 
| County | Buckinghamshire | E10000002 | 
| Constituency (2024) | Mid Buckinghamshire | E14001360 | 
| MP | Greg Smith | Conservative | 
| Police force | Thames Valley | |
| Water company | Thames Water | |
| NUTS/ITL 3 | Buckinghamshire | |
| NUTS/ITL 2 | Berkshire, Buckinghamshire and Oxfordshire | |
| NUTS/ITL 1 | South East | |
| 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) | 17 | |
|---|---|---|
| Households (2011) | 6 | |
| 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 village | |
| Built up area (2024) | Grendon Underwood | E63011317 | 
| Census output area (2021) | E00089207 | |
| Census output area (2011) | 1B3 | |
| Lower layer super output area (2021) | Buckinghamshire 010C | E01017673 | 
| Lower layer super output area (2011) | Aylesbury Vale 010C | E01017673 | 
| Middle layer super output area (2021) | Oakley, Brill & Edgcott | E02003661 | 
| Middle layer super output area (2011) | Oakley, Brill & Edgcott | E02003661 | 
| Travel to work area | Oxford | E30000250 | 
| Average property price in Hemel Hempstead | £448,607 | 
|---|---|
| Annual change | -0.3% | 
| Address | Type | Date | Price | 
|---|---|---|---|
| 3 Old Farm Court, Main Street, Grendon Underwood | Detached (freehold) | Sep 2017 | £640,000 | 
| Detached (freehold) | Jul 2011 | £405,000 | |
| Detached (freehold) | Jul 1999 | £237,000 | |
| 1 Old Farm Court, Main Street, Grendon Underwood | Detached (freehold) | Aug 2017 | £584,000 | 
| Detached (freehold) | Dec 2013 | £435,000 | |
| Detached (freehold) | Mar 1998 | £205,000 | |
| Manorside, Main Street, Grendon Underwood | Detached (freehold) | Jun 2013 | £470,000 |