Streets: OpenStreetMap residential and living streets, snapshot 23 Oct 2026 13:39 UTC, via the Overpass API. © OpenStreetMap contributors, ODbL.
Borough boundaries: ONS Local Authority Districts (May 2026), generalised clipped. Open Government Licence; contains OS data © Crown copyright.
Zone boundaries: each council's published layer, listed in the table. Lambeth, Hackney and Tower Hamlets use the Open Government Licence; Sutton marks its data public domain; Kensington and Chelsea uses CC-BY. The others state no licence, and the consultant and staff copies need council permission before public use.
Council online maps, read 23 Oct 2026: Brent (CPZ map, layer updated Sep 2026), Enfield (CPZ page map), Greenwich (CPZ map, polygons updated Oct 2026), Lewisham (MapThat map), Redbridge (permit parking zones map), Southwark (parking map) and Hounslow (Statmap CPZ map, whose outlines were traced from the map images and named with its identify tool). These maps are published for viewing, not as open data.
Street lists: Ealing and Bexley council websites and Wandsworth's CPZ street finder, read 23 Oct 2026; Havering's Parking Permit Zones Lookup (40 zones), read 23 Oct 2026; Richmond's CPZ spaces spreadsheet (2015) with its current zone times page, plus Richmond's CPZ checker, looked up on 23 Oct 2026 for each of the 808 street names missing from the 2015 lists. Royal Parks outlines: OpenStreetMap.
Traced PDF maps: Croydon's 20 permit zone maps (croydon.gov.uk, dated 2008 to 2021), with zone hours from the council's RingGo parking locator (tariffs updated 30–31 Mar 2026), the maps' own notes, and the council's traffic-order notices for the 2019–20 extensions; Waltham Forest's CPZ Overview Map (walthamforest.gov.uk, 5 Mar 2026) and its colour key for hours. Both were placed on the map here and traced; they are published for viewing, not as open data.
Bromley: CPZ boundaries and traffic-order restriction lines released by the council under a Freedom of Information request (WhatDoTheyKnow, 12 August 2026). Sutton's restriction lines: the council's open WFS (public domain). Zone hours checked against council pages and traffic-order notices.
Cross-check: Healthy Streets Scorecard 2026, CPZ coverage by borough (Datawrapper data, council data as of May 2025). Area names: OpenStreetMap places with a Wikidata or Wikipedia link, or listed in Wikipedia's List of areas of London.
Postcodes: ONS Postcode Directory, latest edition, the 180,965 live postcodes in the London region, read 23 Oct 2026. Source: Office for National Statistics, Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026; Royal Mail data © Royal Mail copyright and database right 2026; GeoPlace data © Local Government Information House Limited copyright and database right 2026.
Portsmouth: residential and living streets from OpenStreetMap, snapshot 24 Oct 2026 01:04 UTC, via the Overpass API (© OpenStreetMap contributors, ODbL). City outline: ONS Local Authority Districts (May 2026), Open Government Licence. Zones (the shapes on each zone page's map), road lists, hours and visitor rules: Portsmouth City Council's 47 zone pages, read 24 Oct 2026; published for viewing, not as open data. Yellow lines, limited-waiting and pay and display bays: The Portsmouth City Council (Consolidation) (On-Street Parking Places and Restrictions on Waiting and Loading) (No.1) Order 2022, in operation from 31 May 2022, read street by street; later amendments aren't included. Pay and display streets also from the council's city centre charges notice (March 2025) and seafront parking order (2025). Busier streets: OpenStreetMap unclassified, tertiary, secondary and primary roads, snapshot 24 Oct 2026 01:35 UTC.
Hatfield: streets from OpenStreetMap (residential, living, unclassified, tertiary, secondary and primary roads), snapshot 24 Oct 2026 02:52 UTC, via the Overpass API (© OpenStreetMap contributors, ODbL); house numbers for zones that take only part of a street also from OpenStreetMap addresses. Town outline: ONS Parishes and Non Civil Parished Areas (December 2024), Hatfield, Open Government Licence. Zones, road lists and hours: Welwyn Hatfield Borough Council's parking permit areas page for Hatfield, read 24 Oct 2026; published for viewing, not as open data. Zone B12's house numbers: the list of addresses eligible for permits in The Borough of Welwyn Hatfield (Control of Parking) (Consolidation) Order 2021.
Postcodes and places outside London: looked up as you type with postcodes.io, which uses the ONS Postcode Directory, OS Open Names and the Scottish Postcode Directory. Contains OS data © Crown copyright and database right; Royal Mail data © Royal Mail copyright and database right; National Statistics data © Crown copyright and database right; NRS data © Crown copyright and database right. Northern Ireland postcodes are free for non-commercial use. This works on the website only.