GeoPlace is a partnership owned equally by Local Government Association and Ordnance Survey (OS) and is responsible for collating, managing and maintaining the primary UK authoritative geospatial address and street data. GeoPlace aggregates all Local Land and Property Gazetteers (LLPGs) created by local authorities adding addresses from Improvement Service in Scotland, Land and Property Services in Northern Ireland and the Isle of Man and Channel Islands and integrating datasets from the Valuation Office Agency (VOA), Royal Mail and Ordnance Survey amongst others. Local authorities hold the responsibility as the legal source of addresses in the UK and this means this aggregated data is officially recognised and authoritative. Each local authority is responsible for creating and maintaining a complete and granular set of all addressable locations in their area. That responsibility to name and number properties and streets is defined in legislation. Street names and property addresses are created as new properties or changes to the built environment take place as part of their planning and development processes. With over 45 million addresses covering over 40 million buildings and related structures on almost 1.5 million streets, the data held by GeoPlace and available as AddressBase is the most complete and granular view of geospatial addresses available for the UK today. The address data is made widely available as the AddressBase products and specialist addressing services by Ordnance Survey and their partners. The street data maintained by local authorities is underpinned by legislation and used by all organisations with a remit to undertake street and road works, to ensure coordination and appropriate permissions are given for street works. The data is made available as the National Street Gazetteer and available via DataVia, an API. Within the data, are the two identifiers –UPRNs and USRNs – which have also been released under Open Government Licence. The Open Standards Board has mandated the use of these identifiers across central government, for referencing and sharing all property and street information. This means all new public sector systems and projects that include address and/or street data should include these identifiers. Find out more https://www.geoplace.co.uk/addresses-streets.