NN3 postcode district: Northampton and around

NN3 is a postcode district in England, with 1,315 postcodes in use in 8 sectors. It has postcodes in Northampton and Moulton. It is split between 2 councils: West Northamptonshire (1,314 postcodes) and North Northamptonshire (1).

Postcodes in use: 1,315
Sectors: 8
Councils: 2 councils
Places: 2 places

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

Every postcode in NN3, and which are new since 2020

New since 2020: 34
In use before 2020: 1,281
Outline: where 5 or more new postcodes since 2020 lie together

Of the 1,315 postcodes in NN3 that ONS places, 34 are new since 2020 and 1,281 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 170 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 52.2641, longitude -0.8423. 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

NN3 0ASMarch 2026 NN3 7EEAugust 2025 NN3 6GFOctober 2024 NN3 7EFJuly 2024 NN3 8BYFebruary 2024

5 further out, not drawn

These postcodes lie well apart from the rest, so the map is drawn without them to show the rest closer; they are in every count.

NN3 5LU NN3 7NW NN3 7QN NN3 7XA NN3 9BZ

Where the new postcodes lie together

8 new postcodes since 2020, outlined on the map. NN3 7WE, is the newest of them.
6 new postcodes since 2020, outlined on the map. NN3 8BY, is the newest of them.

What broadband can you get in NN3?

Ofcom reports on 1,285 of the 1,315 postcodes in NN3. At 1,190 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit1,190 of 1,285

Postcodes where every home can get superfast1,267 of 1,285

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 NN3 at risk of flooding?

34 of the 1,315 postcodes in NN3 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 1,226 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 34 of 1,315 postcodes High: 1,064Medium: 162Low: 131Very low: 164

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 NN3?

Homes in NN3 sold for a typical £270,000 in the 12 months to August 2026, across 736 sales, no change on the 12 months before, HM Land Registry's figures show.

£270,000 typical price, the 12 months to August 2026

£270,000 12 months to August 2025

■ no change on the 12 months before

Detached £369,998 214 sales
Semi-detached £263,000 295 sales
Terraced £220,000 193 sales
Flat or maisonette £145,000 34 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