HP18 postcode district: Aylesbury and around

HP18 is a postcode district in England, with 695 postcodes in use in 3 sectors. It has postcodes in Aylesbury, Long Crendon and Stoke Mandeville. It is split between 3 councils: Buckinghamshire (686 postcodes), Cherwell (6) and South Oxfordshire (3). 9 of its 695 postcodes are in Oxfordshire. ONS lists no county for the other 686.

Postcodes in use: 695
Sectors: 3
Councils: 3 councils
Places: 3 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in HP18, and which are new since 2020

New since 2020: 29
In use before 2020: 666
Outline: where 5 or more new postcodes since 2020 lie together

Of the 695 postcodes in HP18 that ONS places, 29 are new since 2020 and 666 were in use before 2020.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. New since 2020 means it came into use in January 2020 or later. A dashed outline shows where 5 or more lie within 200 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 51.8200, longitude -0.9680. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The 5 newest postcodes

HP18 9GUJune 2026 HP18 0YROctober 2024 HP18 1BDAugust 2024 HP18 9GSFebruary 2024 HP18 9GRDecember 2023

Where the new postcodes lie together

12 new postcodes since 2020, outlined on the map. HP18 1BA, is the newest of them.

What broadband can you get in HP18?

Ofcom reports on 687 of the 695 postcodes in HP18. At 428 of them every home and business can get gigabit broadband, and at 24 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit428 of 687

Postcodes where every home can get superfast553 of 687

Postcodes where some cannot get decent broadband24 of 687

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is HP18 at risk of flooding?

63 of the 695 postcodes in HP18 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 149 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 63 of 695 postcodes High: 67Medium: 82Low: 352Very low: 7

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in HP18?

Homes in HP18 sold for a typical £403,750 in the 12 months to August 2026, across 228 sales, up 3.5% on the 12 months before, HM Land Registry's figures show.

£403,750 typical price, the 12 months to August 2026

£390,000 12 months to August 2025

▲ up 3.5% on the 12 months before

Detached £625,000 75 sales
Semi-detached £392,500 72 sales
Terraced £360,000 57 sales
Flat or maisonette £204,000 24 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it