SG3
Postcode districtPostcode district covering Knebworth, Woolmer Green and Datchworth, in North Hertfordshire, Welwyn Hatfield and East Hertfordshire.
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 SG3 postcode. How census figures are added up
Radon Affected Area by postcode district
Worked out by Open Index · 2022
About 100% of people in SG3 live in a 1 km square that the radon atlas marks as a radon Affected Area.
How SG3 compares
Each dot is a postcode district. The black line marks the middle one.
Is SG3 safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in SG3 at a rate of 53.2 per 1,000 people.
That compares with 73.9 per 1,000 people across the SG postcode area.
In August 2026 alone, 29 cases of crime and anti-social behaviour were recorded in SG3.
In the 12 months to August 2026, the most common types were violence and sexual offences (133), anti-social behaviour (99) and other crime (52).
A year earlier, the recorded crime rate in SG3 was 59.3 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 SG3, neighbourhood by neighbourhood
- Deprivation is ranked by neighbourhood, so SG3 has no single figure. Of its 5 neighbourhoods with a rank:
- Decile 7: 1 neighbourhood
- Decile 8: 1 neighbourhood
- Decile 9: 2 neighbourhoods
- Decile 10 (England’s least deprived 10%): 1 neighbourhood
English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.
Neighbourhoods in SG3
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| East Hertfordshire 019E | 2,352 | 47.3 per 1,000 | 8 | 28.7% |
| North Hertfordshire 015D | 1,886 | 38.7 per 1,000 | 9 | 82.5% |
| North Hertfordshire 015E | 1,850 | 61.9 per 1,000 | 10 | 90.6% |
| North Hertfordshire 015F | 1,712 | 57.9 per 1,000 | 7 | 98.3% |
| Welwyn Hatfield 001C | 1,409 | 45.2 per 1,000 | 9 | 89.0% |
MPs for SG3
- Kevin BonaviaLabourMP for Stevenage76% of SG3’s postcodes
- Andrew LewinLabourMP for Welwyn Hatfield24% of SG3’s postcodes
- Chris HinchliffLabourMP for North East Hertfordshire0.5% of SG3’s postcodes
As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.
Middle areas in SG31
Postcode sectors in SG31
Councils SG3 covers3
Postcode districts next to SG35
Nearest rail stations4
More in the SG postcode area2
SG3 in brief
SG3 is a postcode district covering Knebworth, Woolmer Green and Datchworth, in North Hertfordshire, Welwyn Hatfield and East Hertfordshire.
About 7,374 people lived in SG3 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £470,000 in 2025 across 145 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 53.2 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in SG3 was £470,000 in 2025.
SG3 had 7,126 usual residents at the census.
About 100% of people in SG3 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In SG3, 83.0% of homes and businesses could get gigabit-capable broadband in January 2026.