Sources for Hertsmere
DistrictThe south west of the East of England. 110,242 people (mid-2025 estimate) in 101 square kilometres.
Every dataset behind the figures on Hertsmere’s pages, with its publisher, licence and edition.
British Geological Survey and UK Health Security Agency
Edition: Indicative Atlas of Radon: GB v3, NI v1, published 1 December 2022
Contains British Geological Survey materials © UKRI 2022. Radon Potential classification UK Health Security Agency © Crown copyright 2022. Contains OS data © Crown copyright 2020. Contains public sector information licensed under the Open Government Licence v3.0.
Department for Education
Edition: edubasealldata20261015.csv, published 15 October 2026
Contains public sector information licensed under the Open Government Licence v3.0. Source: Department for Education, Get Information About Schools.
Department for Education
Edition: Performance tables: KS2 2024/25, KS4 2025/26, published 15 October 2026
Source: Department for Education, school performance tables. Contains public sector information licensed under the Open Government Licence v3.0.
Department for Environment, Food & Rural Affairs
Edition: Background maps 2025 (CMAQ-Urban, 1 km), published 9 October 2026
Source: Defra, modelled background air pollution maps. Contains public sector information licensed under the Open Government Licence v3.0.
Department for Environment, Food & Rural Affairs
Edition: Strategic noise mapping Round 4 (2021), Lden, published 8 December 2023
© Department for Environment, Food & Rural Affairs copyright and/or database right 2023. All rights reserved. Contains public sector information licensed under the Open Government Licence v3.0.
People in loud road or rail noise, Road and rail noise by postcode
Department for Transport
Edition: Stops.csv
Contains public sector information licensed under the Open Government Licence v3.0. Source: Department for Transport, National Public Transport Access Nodes (NaPTAN).
Department for Transport
Edition: 2021-2025, published 30 July 2026
Contains public sector information licensed under the Open Government Licence v3.0. Source: Department for Transport, road safety data (STATS19).
People killed or seriously injured on roads, Reported road collisions per 1,000 people, Road collisions
Environment Agency
Edition: Postcodes in Areas at Risk 2026-06-18, published 18 June 2026
© Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064
Environment Agency
Edition: Flood Zones 2026-07-15, published 15 July 2026
© Environment Agency copyright and/or database right 2025. All rights reserved.
Geolytix
Edition: Retail Points v46 (2026-06)
Contains GEOLYTIX Retail Points data. Contains public sector information licensed under the Open Government Licence v3.0. Contains Ordnance Survey data © Crown copyright and database right 2021. Contains Royal Mail data © Royal Mail copyright and database right 2021. Contains National Statistics data © Crown copyright and database right 2021.
Historic England
Edition: listed-building 2026-10-15, published 15 October 2026
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
Price Paid Data
OGL-3.0HM Land Registry
Edition: pp-complete.csv 2026-08, published 28 September 2026
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
UK House Price Index
OGL-3.0HM Land Registry, Registers of Scotland, Land & Property Services Northern Ireland and the Office for National Statistics
Edition: Average-prices-2026-08.csv + UK-HPI-full-file-2026-08.csv, published 21 October 2026
Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
Average house price, Annual price change, Detached house price, Flat price, Semi-detached house price, Terraced house price, House sales per month, House price to pay
House of Commons Library
Edition: General election 2024, candidate-level results, published 4 July 2024
Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: House of Commons Library, UK Parliament election results.
Majority, 2024 general election, Conservative vote share, 2024 general election, Green Party vote share, 2024 general election, Labour vote share, 2024 general election, Liberal Democrat vote share, 2024 general election, Reform UK vote share, 2024 general election, Turnout, 2024 general election
Local planning authorities in England and Historic England, collected by the Ministry of Housing, Communities and Local Government
Edition: conservation-area 2026-10-15, published 15 October 2026
© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
Ministry of Housing, Communities and Local Government
Edition: Band_D_2026-27.ods + Table_10_2026-27.ods + Tables_1-9_2026-27.ods, published 22 April 2026
Source: Ministry of Housing, Communities and Local Government, Council Tax statistics. Crown copyright. Contains public sector information licensed under the Open Government Licence v3.0.
Ministry of Housing, Communities and Local Government
Edition: green-belt 2026-10-15, published 15 October 2026
Your use of OS OpenData is subject to the terms at http://os.uk/opendata/licence. Contains Ordnance Survey data © Crown copyright and database right 2026.
Ministry of Housing, Communities and Local Government
Edition: IoD2025 File 7 + IoD2025 File 10 v2, published 30 October 2025
Source: Ministry of Housing, Communities and Local Government, English Indices of Deprivation 2025. Crown copyright. Contains public sector information licensed under the Open Government Licence v3.0.
English Indices of Deprivation 2025, Education deprivation (England), Employment deprivation (England), Health deprivation (England), Income deprivation (England), Share of neighbourhoods in England's most deprived 10%, Neighbourhoods in England's most deprived 20%, Deprivation score (England)
Scotland's Census 2022
OGL-3.0National Records of Scotland
Edition: Scotland's Census 2022 bulk tables, July 2026, published 21 July 2026
Source: National Records of Scotland, Scotland's Census 2022. Crown copyright. Licensed under the Open Government Licence v3.0.
Aged 15 to 64, Aged 65 and over, Aged under 15, Born outside the UK, Disability, Good or very good health, Households, Households without a car or van, Owner-occupied homes, Population density, Population, Private rented homes, Social rented homes
Natural Resources Wales
Edition: Flood Map for Planning 2026-05-21, published 21 May 2026
Contains Natural Resources Wales information © Natural Resources Wales and database right. All rights reserved. Some features of this information are based on digital spatial data licensed from the UK Centre for Ecology & Hydrology © UKCEH. Defra, Met Office and DARD Rivers Agency © Crown copyright. © Cranfield University. © James Hutton Institute. Contains OS data © Crown copyright and database right.
NHS England Organisation Data Service
Edition: ODS edispensary fetched 2026-10-19 + ODS egdpprac fetched 2026-10-19, published 19 October 2026
Source: NHS England Organisation Data Service. Contains public sector information licensed under the Open Government Licence v3.0.
NHS England Organisation Data Service
Edition: epraccur fetched 2026-10-15, published 15 October 2026
Source: NHS England Organisation Data Service. Contains public sector information licensed under the Open Government Licence v3.0.
Northern Ireland Statistics and Research Agency
Edition: Census 2021 Flexible Table Builder extract, October 2026
Source: NISRA, Census 2021. Website: www.nisra.gov.uk. Crown copyright, licensed under the Open Government Licence v3.0.
Aged 15 to 64, Aged 65 and over, Aged under 15, Born outside the UK, Degree-level qualifications, Disability, Good or very good health, Households, Households without a car or van, Owner-occupied homes, Population density, Population, Private rented homes, Social rented homes
Connected Nations (Ofcom)
OGL-3.0Ofcom
Edition: Connected Nations update: Spring 2026, published 13 May 2026
Source: Ofcom, Connected Nations update: Spring 2026 (Ofcom copyright). Contains public sector information licensed under the Open Government Licence v3.0.
Broadband by postcode, Full-fibre broadband coverage, Full-fibre take-up, Gigabit broadband coverage, 4G coverage from all four networks
Office for National Statistics
Edition: Census 2021 topic summaries (Nomis bulk), published 19 January 2023
Source: Office for National Statistics, Census 2021, licensed under the Open Government Licence v.3.0.
Aged 15 to 64, Aged 65 and over, Aged under 15, Born outside the UK, Degree-level qualifications, Disability, Asian, Asian British or Asian Welsh, Black, Black British, Black Welsh, Caribbean or African, Mixed or Multiple ethnic groups, Other ethnic group, White ethnic groups, Good or very good health, Households, Households without a car or van, Owner-occupied homes, Population density, Population, Private rented homes, Christian, No religion, Social rented homes, Working mainly from home
ONS Postcode Directory
OGL-3.0Office for National Statistics
Edition: ONSPD_AUG26, published 7 September 2026
Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026.
Broadband by postcode, Flood risk by postcode, Road and rail noise by postcode
Annual Population Survey
OGL-3.0Office for National Statistics
Edition: APS year to March 2026, published 21 July 2026
Source: Office for National Statistics, Annual Population Survey, licensed under the Open Government Licence v.3.0.
Office for National Statistics
Edition: Life expectancy 2022 to 2024, published 10 December 2025
Source: Office for National Statistics, Life expectancy for local areas of the UK, licensed under the Open Government Licence v.3.0.
Office for National Statistics
Edition: ASHE 2025 provisional, published 23 October 2025
Source: Office for National Statistics, Annual Survey of Hours and Earnings, licensed under the Open Government Licence v.3.0.
Price Index of Private Rents
OGL-3.0Office for National Statistics
Edition: PIPR 21 October 2026, published 21 October 2026
Source: Office for National Statistics, Price Index of Private Rents, licensed under the Open Government Licence v.3.0.
One-bedroom private rent, Two-bedroom private rent, Three-bedroom private rent, Four-bedroom or larger private rent, Average private rent, Annual rent change
Claimant count (Nomis)
OGL-3.0Office for National Statistics (Nomis)
Edition: Claimant count to August 2026, published 15 September 2026
Source: Office for National Statistics, claimant count (Nomis). Population estimates: Office for National Statistics, National Records of Scotland and NISRA. Licensed under the Open Government Licence v.3.0.
Office for National Statistics, National Records of Scotland and the Northern Ireland Statistics and Research Agency
Edition: mid-2025, published 1 October 2026
Source: Office for National Statistics licensed under the Open Government Licence v.3.0.
Estimates of station usage
OGL-3.0Office of Rail and Road
Edition: 2024-25, published 4 December 2025
Source: Office of Rail and Road, estimates of station usage. Contains public sector information licensed under the Open Government Licence v3.0.
Ofsted
Edition: Latest inspections as at 30 September 2026, published 16 October 2026
Source: Ofsted. Contains public sector information licensed under the Open Government Licence v3.0.
Code-Point Open
OS-OpenDataOrdnance Survey
Edition: Code-Point Open 2026-08
Contains Ordnance Survey data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026.
Dental practices, Number of GP practices, GP practices, Pharmacies, Number of schools, Schools
OS Open Greenspace
OGL-3.0Ordnance Survey
Edition: OS Open Greenspace 2026-04
Contains OS data © Crown copyright and database right 2026.
Police forces in England, Wales and Northern Ireland, published by the Single Online Home National Digital Team
Edition: 2026-08.zip, published 30 September 2026
Contains public sector information licensed under the Open Government Licence v3.0. Source: data.police.uk.
Anti-social behaviour, Burglary, Crime and anti-social behaviour, Criminal damage and arson, Drug offences, Other crime, Recorded crime rate, Robbery, Shoplifting, Theft from the person, Vehicle crime, Violence and sexual offences, Street-level crime
Public Health Scotland
Edition: GP Practices and List sizes July 2026, published 28 July 2026
Source: Public Health Scotland. Contains public sector information licensed under the Open Government Licence v3.0.
Scottish Government
Edition: band-d-history-2026-27.xlsx + bands-2026-27.xlsx, published 31 March 2026
Source: Scottish Government, Council Tax datasets. Crown copyright. Contains public sector information licensed under the Open Government Licence v3.0.
Scottish Government
Edition: school contact list 31 July 2026
Contains public sector information licensed under the Open Government Licence v3.0. Copyright Scottish Government, contains Ordnance Survey data © Crown copyright and database right 2024, and data created and maintained by Scottish Local Government © Local Government Information House Limited copyright and database rights 2024.
Valuation Office Agency
Edition: CTSOP1.1 2026, published 24 September 2026
Source: Valuation Office Agency, Council Tax: stock of properties. Crown copyright. Contains public sector information licensed under the Open Government Licence v3.0.
Homes in council tax Band A, Homes in council tax Band B, Homes in council tax Band C, Homes in council tax Band D, Homes in council tax Band E, Homes in council tax Band F, Homes in council tax Band G, Homes in council tax Band H
Council tax levels in Wales
OGL-3.0Welsh Government
Edition: StatsWales Band D to 2026-27, published 24 March 2026
Source: Welsh Government, council tax levels. Contains public sector information licensed under the Open Government Licence v3.0.
Welsh Government
Edition: Maintained schools, revised 23 April 2026, published 23 April 2026
Contains public sector information licensed under the Open Government Licence v3.0. Source: Welsh Government. Contains OS data © Crown copyright and database right 2026.