CB23 postcode district: Cambourne and around, Cambridgeshire

CB23 is a postcode district in Cambridgeshire, with 883 postcodes in use in 8 sectors. It has postcodes in Cambourne, Papworth Everard, Hardwick and 3 more places. It is split between 2 councils: South Cambridgeshire (881 postcodes) and Cambridge (2).

Postcodes in use: 883
Sectors: 8
Councils: 2 councils
Places: 6 places

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

Every postcode in CB23, and which are new since 2020

New since 2020: 69
In use before 2020: 814
Outline: where 5 or more new postcodes since 2020 lie together

Of the 883 postcodes in CB23 that ONS places, 69 are new since 2020 and 814 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 190 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 52.2154, longitude -0.0339. 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

CB23 6NQDecember 2025 CB23 6NNNovember 2025 CB23 6NUOctober 2025 CB23 6NPSeptember 2025 CB23 6NTJuly 2025

Where the new postcodes lie together

14 new postcodes since 2020, outlined on the map. CB23 6NB, is the newest of them.
8 new postcodes since 2020, outlined on the map. CB23 6NN, is the newest of them.
6 new postcodes since 2020, outlined on the map. CB23 6NQ, is the newest of them.
6 new postcodes since 2020, outlined on the map. CB23 7FQ, is the newest of them.
5 new postcodes since 2020, outlined on the map. CB23 7FJ, is the newest of them.

What broadband can you get in CB23?

Ofcom reports on 864 of the 883 postcodes in CB23. At 600 of them every home and business can get gigabit broadband, and at 7 some cannot get decent broadband (10 Mbit/s).

Postcodes where every home can get gigabit600 of 864

Postcodes where every home can get superfast726 of 864

Postcodes where some cannot get decent broadband7 of 864

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 CB23 at risk of flooding?

39 of the 883 postcodes in CB23 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 99 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 39 of 883 postcodes High: 69Medium: 30Low: 93

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 CB23?

Homes in CB23 sold for a typical £390,000 in the 12 months to August 2026, across 368 sales, down 4.7% on the 12 months before, HM Land Registry's figures show.

£390,000 typical price, the 12 months to August 2026

£409,250 12 months to August 2025

▼ down 4.7% on the 12 months before

Detached £563,750 156 sales
Semi-detached £375,000 94 sales
Terraced £321,750 90 sales
Flat or maisonette £167,500 28 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