# DN21

Postcode district covering Gainsborough and Park Springs, in West Lindsey and North Lincolnshire.

DN21 is a postcode district covering Gainsborough and Park Springs, in West Lindsey and North Lincolnshire. Median sale price £177,000 in 2025.

Postcode district. Code DN21. In: [Postcodes](https://openindex.co.uk/postcode) › [DN](https://openindex.co.uk/postcode/dn)

Approximate outline worked out by Open Index from the ONS Postcode Directory: each census output area belongs to the district that holds most of its postcodes. People, homes, recorded crime and broadband add up those output areas. House sales count every sale with an DN21 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £177,000** (2025). The median price paid for a home in DN21 was £177,000 in 2025. Joint 225th cheapest of 2,235. Source: Worked out by Open Index from HM Land Registry Price Paid Data. Published 28 September 2026. https://openindex.co.uk/postcode/dn21#f-house-sales-median-price
- **Population: 39,036** (2021). DN21 had 39,036 usual residents at the census (ONS Census 2021). 490th most populated of 2,756. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/postcode/dn21#f-population
- **People in radon Affected Area squares: 42%** (2022). About 42% of people in DN21 live in a 1 km square that the radon atlas marks as a radon Affected Area. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/postcode/dn21#f-radon-affected-share
- **Gigabit broadband coverage: 80.5%** (January 2026). In DN21, 80.5% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026. https://openindex.co.uk/postcode/dn21#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=DN21) (Worked out by Open Index · 2022): About 42% of people in DN21 live in a 1 km square that the radon atlas marks as a radon Affected Area.
- [Sales per year by postcode district](https://openindex.co.uk/map/house-sales-per-year?place=DN21) (Worked out by Open Index · 2025): 657 homes were sold in DN21 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=DN21) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for DN21.
- [Population by postcode district](https://openindex.co.uk/map/population?place=DN21) (Census 2021, England and Wales): DN21 had 39,036 usual residents at the census.

## How DN21 compares

Each postcode district against every other postcode district the measure covers.

| Measure | DN21 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £177,000 | 14th cheapest | 32 postcode districts, DN · 2025 |
| Population | 39,036 | 4th most populated | 32 postcode districts, DN · 2021 |
| People in radon Affected Area squares | 42% | joint 10th most people in radon Affected Areas | 32 postcode districts, DN · 2022 |
| Gigabit broadband coverage | 80.5% | 6th lowest | 32 postcode districts, DN · Jan 2026 |

## Is DN21 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in DN21 at a rate of 120.6 per 1,000 people.
That compares with 116.1 per 1,000 people across the DN postcode area.
In August 2026 alone, 381 cases of crime and anti-social behaviour were recorded in DN21.
In the 12 months to August 2026, the most common types were violence and sexual offences (1,791), anti-social behaviour (1,030) and other crime (669).
A year earlier, the recorded crime rate in DN21 was 126.3 per 1,000 people.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.

## Deprivation in DN21, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so DN21 has no single figure. Of its 21 neighbourhoods with a rank:
- Decile 1 (England’s most deprived 10%): 6 neighbourhoods
- Decile 2: 3 neighbourhoods
- Decile 3: 2 neighbourhoods
- Decile 4: 2 neighbourhoods
- Decile 5: 3 neighbourhoods
- Decile 6: 2 neighbourhoods
- Decile 7: 1 neighbourhood
- Decile 8: 2 neighbourhoods

Source: English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.

## Neighbourhoods in DN21

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [North Lincolnshire 022A](https://openindex.co.uk/north-lincolnshire/neighbourhood/e01013322) | 2,139 | 39.2 per 1,000 | 6 | 95.1% |
| [North Lincolnshire 022B](https://openindex.co.uk/north-lincolnshire/neighbourhood/e01013323) | 1,562 | 29.7 per 1,000 | 5 | 93.3% |
| [West Lindsey 002A](https://openindex.co.uk/west-lindsey/neighbourhood/e01026380) | 2,559 | 86.4 per 1,000 | 6 | 86.1% |
| [West Lindsey 002B](https://openindex.co.uk/west-lindsey/neighbourhood/e01026401) | 1,611 | 54.7 per 1,000 | 8 | 64.2% |
| [West Lindsey 002C](https://openindex.co.uk/west-lindsey/neighbourhood/e01026402) | 1,873 | 44.5 per 1,000 | 8 | 97.3% |
| [West Lindsey 002D](https://openindex.co.uk/west-lindsey/neighbourhood/e01026403) | 1,354 | 57.2 per 1,000 | 5 | 7.8% |
| [West Lindsey 002E](https://openindex.co.uk/west-lindsey/neighbourhood/e01026407) | 1,370 | 53.3 per 1,000 | 4 | 11.0% |
| [West Lindsey 002F](https://openindex.co.uk/west-lindsey/neighbourhood/e01026408) | 1,372 | 60.0 per 1,000 | 5 | 95.6% |
| [West Lindsey 004A](https://openindex.co.uk/west-lindsey/neighbourhood/e01026378) | 1,726 | 131.2 per 1,000 | 1 | 99.9% |
| [West Lindsey 004B](https://openindex.co.uk/west-lindsey/neighbourhood/e01026379) | 1,839 | 103.5 per 1,000 | 3 | 97.9% |
| [West Lindsey 004C](https://openindex.co.uk/west-lindsey/neighbourhood/e01026381) | 1,721 | 112.1 per 1,000 | 2 | 97.7% |
| [West Lindsey 004D](https://openindex.co.uk/west-lindsey/neighbourhood/e01026382) | 1,773 | 199.1 per 1,000 | 2 | 96.0% |
| [West Lindsey 004E](https://openindex.co.uk/west-lindsey/neighbourhood/e01026383) | 1,298 | 301.0 per 1,000 | 1 | 96.1% |
| [West Lindsey 004F](https://openindex.co.uk/west-lindsey/neighbourhood/e01026384) | 2,143 | 553.8 per 1,000 | 1 | 86.2% |
| [West Lindsey 005A](https://openindex.co.uk/west-lindsey/neighbourhood/e01026385) | 1,076 | 44.1 per 1,000 | 4 | 74.2% |
| [West Lindsey 005B](https://openindex.co.uk/west-lindsey/neighbourhood/e01026386) | 1,243 | 100.5 per 1,000 | 2 | 28.2% |
| [West Lindsey 006A](https://openindex.co.uk/west-lindsey/neighbourhood/e01026374) | 1,527 | 106.7 per 1,000 | 1 | 98.0% |
| [West Lindsey 006B](https://openindex.co.uk/west-lindsey/neighbourhood/e01026375) | 2,048 | 125.2 per 1,000 | 1 | 88.5% |
| [West Lindsey 006C](https://openindex.co.uk/west-lindsey/neighbourhood/e01026376) | 1,692 | 181.8 per 1,000 | 1 | 98.1% |
| [West Lindsey 006D](https://openindex.co.uk/west-lindsey/neighbourhood/e01026377) | 2,210 | 106.7 per 1,000 | 3 | 99.8% |
| [West Lindsey 007A](https://openindex.co.uk/west-lindsey/neighbourhood/e01026388) | 2,116 | 37.6 per 1,000 | 7 | 83.6% |

## Your MP

- [Gainsborough](https://openindex.co.uk/constituency/gainsborough): Sir Edward Leigh (Conservative), MP since July 2024. 89% of the people here.
- [Scunthorpe](https://openindex.co.uk/constituency/scunthorpe): Sir Nicholas Dakin (Labour), MP since July 2024. 11% of the people here.
- [Bassetlaw](https://openindex.co.uk/constituency/bassetlaw): Jo White (Labour), MP since July 2024. 0.3% of the people here.

As of 18 October 2026. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

## Middle areas in DN21

[Gainsborough East](https://openindex.co.uk/west-lindsey/gainsborough-east), [Gainsborough West](https://openindex.co.uk/west-lindsey/gainsborough-west), [Hemswell & Spital](https://openindex.co.uk/west-lindsey/hemswell-and-spital), [Morton, Blyton & Scotter](https://openindex.co.uk/west-lindsey/morton-blyton-and-scotter)

## Postcode sectors in DN21

[DN21 1 (372 postcodes)](https://openindex.co.uk/postcode/dn21-1), [DN21 2 (212 postcodes)](https://openindex.co.uk/postcode/dn21-2), [DN21 3 (268 postcodes)](https://openindex.co.uk/postcode/dn21-3), [DN21 4 (243 postcodes)](https://openindex.co.uk/postcode/dn21-4), [DN21 5 (266 postcodes)](https://openindex.co.uk/postcode/dn21-5), [DN21 9 (10 postcodes)](https://openindex.co.uk/postcode/dn21-9)

## Councils DN21 covers

[West Lindsey](https://openindex.co.uk/west-lindsey), [North Lincolnshire](https://openindex.co.uk/north-lincolnshire)

## Towns in DN21

[Gainsborough](https://openindex.co.uk/town/gainsborough)

## Postcode districts next to DN21

[DN16](https://openindex.co.uk/postcode/dn16), [DN17](https://openindex.co.uk/postcode/dn17), [DN20](https://openindex.co.uk/postcode/dn20), [LN1](https://openindex.co.uk/postcode/ln1), [LN7](https://openindex.co.uk/postcode/ln7), [LN8](https://openindex.co.uk/postcode/ln8)

## More in the DN postcode area

[All DN postcode districts](https://openindex.co.uk/postcode/dn), [Every UK postcode area](https://openindex.co.uk/postcode)

## DN21 in brief

DN21 is a postcode district covering Gainsborough and Park Springs, in West Lindsey and North Lincolnshire.
About 40,244 people lived in DN21 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £177,000 in 2025 across 657 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 120.6 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in DN21 was £177,000 in 2025.
DN21 had 39,036 usual residents at the census.
About 42% of people in DN21 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In DN21, 80.5% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: DN21
- Postcode area: [DN](https://openindex.co.uk/postcode/dn)
- Constituency: [Gainsborough †](https://openindex.co.uk/constituency/gainsborough)
- Council: [West Lindsey †](https://openindex.co.uk/west-lindsey)
- Area: 340 km²
- People, mid-2024: 40,244*
- Neighbourhoods: 21
- Output areas: 129

* People: worked out by Open Index from neighbourhood estimates, shared out by where people lived at the census (by area in Northern Ireland). This area's edges do not follow neighbourhood edges, so the figure is close but not exact.
† Best fit: the constituency, council, region and nation this postcode district mostly lies in. Its edges do not follow theirs.

## Next door

[LN8](https://openindex.co.uk/postcode/ln8), [LN1](https://openindex.co.uk/postcode/ln1), [DN20](https://openindex.co.uk/postcode/dn20), [DN17](https://openindex.co.uk/postcode/dn17), [LN7](https://openindex.co.uk/postcode/ln7), [DN16](https://openindex.co.uk/postcode/dn16)

## Latest updates for DN21

- August 2026 house prices published: HM Land Registry and partners · Oct 2026.
- September 2026 rent published: ONS private rents · Oct 2026.
- Dental practices updated: NHS England · Oct 2026.
- Schools updated: Ofsted · Oct 2026.

The same figures as JSON: https://openindex.co.uk/v1/places/DN21

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/dn21, or to one figure with its anchor, https://openindex.co.uk/postcode/dn21#f-house-sales-median-price.

Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it.

Snapshot 2026.10.9. The HTML page: https://openindex.co.uk/postcode/dn21