DN31 postcode district: Grimsby and around, North East Lincolnshire

DN31 is a postcode district in England, with 458 postcodes in use in 4 sectors. It has postcodes in Grimsby and Immingham. Its council is North East Lincolnshire.

Postcodes in use: 458
Sectors: 4
Council: North East Lincolnshire
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 DN31, and which are new since 2020

New since 2020: 18
In use before 2020: 440
Outline: where 5 or more new postcodes since 2020 lie together

Of the 458 postcodes in DN31 that ONS places, 18 are new since 2020 and 440 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 150 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. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 53.5700, longitude -0.0898. 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

DN31 9NHJuly 2026 DN31 1BXJune 2026 DN31 9NGJune 2026 DN31 9NFOctober 2025 DN31 9LRFebruary 2025

2 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.

DN31 2TT DN31 3AS

Where the new postcodes lie together

10 new postcodes since 2020, outlined on the map. DN31 9NH, is the newest of them.

What broadband can you get in DN31?

Ofcom reports on 417 of the 458 postcodes in DN31. At 283 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 gigabit283 of 417

Postcodes where every home can get superfast323 of 417

Postcodes where some cannot get decent broadband7 of 417

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 DN31 at risk of flooding?

379 of the 458 postcodes in DN31 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 856 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 379 of 458 postcodes High: 133Medium: 723Low: 1,995Very low: 4,252

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 DN31?

Homes in DN31 sold for a typical £82,000 in the 12 months to August 2026, across 102 sales, up 3.5% on the 12 months before, HM Land Registry's figures show.

£82,000 typical price, the 12 months to August 2026

£79,238 12 months to August 2025

▲ up 3.5% on the 12 months before

Detached 2 sales, too few to price
Semi-detached £132,000 12 sales
Terraced £80,000 81 sales
Flat or maisonette £45,000 7 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