For historical census data related to Frinton and Walton Urban District (UD), several resources provide detailed information on various aspects such as population, social structure, and industry. Here are the most prominent sources you can explore:

1. Vision of Britain Through Time: This resource offers an extensive database on Frinton and Walton UD, covering a range of historical statistics, including census data from 1801 onwards. You can find population trends, social structure information, occupational data, and more. This site provides interactive maps, tables, and statistical insights across different themes. It includes detailed data for Frinton and Walton on population density, social structure, industrial sectors, and even the changes in local boundaries over time( Historical Statistics on Social Structure for the Local Government District )( Historical Statistics on Population for the Local Government District )( Census tables with data for the Local Government District ).

   • Frinton and Walton UD - Population( Historical Statistics on Population for the Local Government District ) - Frinton and Walton UD - Industry( Historical Statistics on Industry for the Local Government District ) - Frinton and Walton UD - Social Structure( Historical Statistics on Social Structure for the Local Government District )2. The Essex Record Office: The Essex Record Office holds physical archives for census returns, which might also contain detailed records for Frinton and Walton. This includes early census data, as well as local records that may cover more specific information for the area. They offer digitized documents and sometimes access to detailed enumerator's books, which can be accessed in person or online depending on availability.

2. National Archives: The National Archives of the UK holds full census records from 1841 to 1911 for England and Wales, including Essex, which covers the Frinton and Walton UD area. You can search by location or family to access scanned records, including individual census schedules, which can provide detailed information about households during each census year.

3. GENUKI (Genealogy UK and Ireland): GENUKI offers a variety of resources for family historians and can guide you to specific census returns for Essex, including any relating to Frinton and Walton. They link to several other databases and local genealogical archives that may hold more detailed local census returns( Census tables with data for the Local Government District ).

These sources, particularly Vision of Britain, are a great starting point to explore the local demographic and economic history of Frinton and Walton through census data. If you're looking for more granular details, the National Archives and Essex Record Office are invaluable for primary data access.