{ "county": { "county_name": "Gwynedd", "country": "Wales", "census_reference": "2021", "population_approx": 186000, "households_approx": 82000, "population_census_sum": 186299, "household_census_sum": 81973, "current_postcodes": 8497, "postcode_areas": 2, "postcode_districts": 47, "postcode_sectors": 77, "partly_covered_postcode_districts": 3, "partly_covered_postcode_sectors": 4, "area_km2": 3371.3766265389, "population_density_per_km2": 55.3, "current_postcodes_without_population": 728, "current_postcodes_without_households": 819, "county_index": 38, "county_id": "gbmaps:county:gwynedd", "county_slug": "gwynedd", "page_url": "https://www.gbmaps.com/free-county-maps/Gwynedd.php", "geometry_sha256": "8a96a1f35cb9cc71a5909678678c16b54943381675a5fb4ae0376979c58a8181", "postcode_records": 8500, "current_located_postcodes": 8497, "population_records": 7772, "household_records": 7681, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 3, "census_population_in_retired_or_unmatched_postcodes": 20, "source_census_years": "2021", "nearest_boundary_postcodes": 0, "overlapping_outline_postcodes": 0, "postcodes_within_100m_of_boundary": 65, "census_population_within_100m_of_boundary": 769, "lower_quality_coordinate_postcodes": 9, "census_population_with_lower_quality_coordinates": 0, "mixed_census_year_postcodes": 0, "current_postcodes_with_population_pct": 91.432270213, "current_postcodes_with_households_pct": 90.3613039896 }, "paragraphs": [ "The mapped Gwynedd area has approximately 186,000 residents and 82,000 households, based on census counts allocated by postcode location. The figures use 2021 census data.", "The supplied directory places 8,497 current postcode locations in this county, representing 47 postcode districts and 77 postcode sectors. 4 of those sectors also have located postcodes outside the county. These counts describe postcode locations rather than complete postal boundaries.", "The postcode areas LL and SY account for 100.0% of the county's located current postcodes. Among the postcode districts represented, LL57 contributes the largest census population within the mapped county, at approximately 26,800 residents." ], "postcode_areas": [ { "county_name": "Gwynedd", "country": "Wales", "postcode_area": "LL", "current_postcodes": 8354, "population_census_sum": 184747, "household_census_sum": 81223, "located_postcode_share_pct": 41.104, "published_population_share_pct": 34.594, "published_household_share_pct": 34.507, "coverage_by_located_postcodes": "Part of located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 8357, "current_located_postcodes": 8354, "population_records": 7641, "household_records": 7551, "current_postcodes_without_population": 716, "current_postcodes_without_households": 806, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 3, "census_population_in_retired_or_unmatched_postcodes": 20, "source_census_years": "2021", "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 3, "whole_area_current_postcodes": 20324, "whole_area_current_located_postcodes": 20324, "whole_area_population_census_sum": 534044.0, "whole_area_household_census_sum": 235383.0, "whole_area_suppressed_population_records": 0, "whole_area_suppressed_household_records": 0, "other_current_located_postcodes": 11970 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_area": "SY", "current_postcodes": 143, "population_census_sum": 1552, "household_census_sum": 750, "located_postcode_share_pct": 0.977, "published_population_share_pct": 0.443, "published_household_share_pct": 0.492, "coverage_by_located_postcodes": "Part of located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 143, "current_located_postcodes": 143, "population_records": 131, "household_records": 130, "current_postcodes_without_population": 12, "current_postcodes_without_households": 13, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": "2021", "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 8, "whole_area_current_postcodes": 14641, "whole_area_current_located_postcodes": 14640, "whole_area_population_census_sum": 350717.0, "whole_area_household_census_sum": 152519.0, "whole_area_suppressed_population_records": 0, "whole_area_suppressed_household_records": 0, "other_current_located_postcodes": 14497 } ], "postcode_districts": [ { "county_name": "Gwynedd", "country": "Wales", "postcode_district": "LL57", "current_postcodes": 907, "population_census_sum": 26841.0, "household_census_sum": 10328.0, "located_postcode_share_pct": 100.0, 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"suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": "2021", "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 3.0, "whole_sector_current_postcodes": 235, "whole_sector_current_located_postcodes": 235, "whole_sector_population_census_sum": 4540.0, "whole_sector_household_census_sum": 2077.0, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 234 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_sector": "LL41 9", "current_postcodes": 1, "population_census_sum": null, "household_census_sum": null, "located_postcode_share_pct": 100.0, "published_population_share_pct": null, "published_household_share_pct": null, "coverage_by_located_postcodes": "All located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 1, "current_located_postcodes": 1, "population_records": 0, "household_records": 0, "current_postcodes_without_population": 1, "current_postcodes_without_households": 1, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": null, "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 1.0, "whole_sector_current_postcodes": 1, "whole_sector_current_located_postcodes": 1, "whole_sector_population_census_sum": null, "whole_sector_household_census_sum": null, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 0 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_sector": "LL53 9", "current_postcodes": 2, "population_census_sum": null, "household_census_sum": null, "located_postcode_share_pct": 100.0, "published_population_share_pct": null, "published_household_share_pct": null, "coverage_by_located_postcodes": "All located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 2, "current_located_postcodes": 2, "population_records": 0, "household_records": 0, "current_postcodes_without_population": 2, "current_postcodes_without_households": 2, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": null, "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 1.0, "whole_sector_current_postcodes": 2, "whole_sector_current_located_postcodes": 2, "whole_sector_population_census_sum": null, "whole_sector_household_census_sum": null, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 0 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_sector": "LL55 9", "current_postcodes": 8, "population_census_sum": null, "household_census_sum": null, "located_postcode_share_pct": 100.0, "published_population_share_pct": null, "published_household_share_pct": null, "coverage_by_located_postcodes": "All located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 8, "current_located_postcodes": 8, "population_records": 0, "household_records": 0, "current_postcodes_without_population": 8, "current_postcodes_without_households": 8, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": null, "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 1.0, "whole_sector_current_postcodes": 8, "whole_sector_current_located_postcodes": 8, "whole_sector_population_census_sum": null, "whole_sector_household_census_sum": null, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 0 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_sector": "LL57 9", "current_postcodes": 10, "population_census_sum": null, "household_census_sum": null, "located_postcode_share_pct": 100.0, "published_population_share_pct": null, "published_household_share_pct": null, "coverage_by_located_postcodes": "All located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 10, "current_located_postcodes": 10, "population_records": 0, "household_records": 0, "current_postcodes_without_population": 10, "current_postcodes_without_households": 10, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": null, "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 1.0, "whole_sector_current_postcodes": 10, "whole_sector_current_located_postcodes": 10, "whole_sector_population_census_sum": null, "whole_sector_household_census_sum": null, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 0 }, { "county_name": "Gwynedd", "country": "Wales", "postcode_sector": "LL77 9", "current_postcodes": 6, "population_census_sum": null, "household_census_sum": null, "located_postcode_share_pct": 100.0, "published_population_share_pct": null, "published_household_share_pct": null, "coverage_by_located_postcodes": "All located current postcodes", "census_reference": "2021", "county_index": 38, "postcode_records": 6, "current_located_postcodes": 6, "population_records": 0, "household_records": 0, "current_postcodes_without_population": 6, "current_postcodes_without_households": 6, "suppressed_population_records": 0, "suppressed_household_records": 0, "zero_population_records": 0, "zero_household_records": 0, "retired_or_directory_unmatched_census_postcodes": 0, "census_population_in_retired_or_unmatched_postcodes": 0, "source_census_years": null, "county_slug": "gwynedd", "mapped_counties_with_current_postcodes": 1.0, "whole_sector_current_postcodes": 6, "whole_sector_current_located_postcodes": 6, "whole_sector_population_census_sum": null, "whole_sector_household_census_sum": null, "whole_sector_suppressed_population_records": 0, "whole_sector_suppressed_household_records": 0, "other_current_located_postcodes": 0 } ], "source_and_method": { "compiled": "2026-11-07", "method": "One postcode assigned once by centroid to a county outline in the same source country. Small gaps use the nearest outline within 1 km; actual maximum is 287.662 m. Overlaps choose the deepest interior.", "population_label": "Approximate census-based population", "household_label": "Approximate census-based households", "population_years": "2021 in England, Wales and Northern Ireland; 2022 in Scotland. Four combined cross-border postcodes contain both years.", "directory_date_note": "Supplied live directory with February 2026 ONSPD fallbacks; compilation dated 7 November 2026. Current means no termination recorded and a directory match.", "boundary_source": "Existing 91-county GBMaps atlas coverage; the source geometry checksum is included for each county.", "population_method_note": "Published census population is summed for postcode locations assigned to the mapped county. This is an approximate allocation of census residents, not a 2026 population estimate. Published figures for retired postcodes are retained.", "missing_values_note": "Blank or suppressed values remain unknown. Totals sum published values only; no postcode-count uplift or imputation is applied.", "household_definition": "Households from the supplied census sources. Total residents include communal establishments, so population divided by households is not presented as average household size.", "postcode_share_note": "Shares describe located postcode points or published census totals, not land area, exact address coverage or current population.", "ni_note": "The 91 county maps cover Great Britain. Northern Ireland remains in the UK district/sector totals, with 5,591 suppressed postcode records; their published subtotals are incomplete.", "sources": [ { "name": "England and Wales Census 2021 postcode counts", "url": "https://www.nomisweb.co.uk/sources/census_2021_pc" }, { "name": "Scotland Census 2022 geography and postcode data", "url": "https://www.nrscotland.gov.uk/publications/2022-census-geography-products" }, { "name": "Northern Ireland Census 2021 postcode estimates", "url": "https://www.nisra.gov.uk/publications/census-2021-person-and-household-estimates-postcodes-northern-ireland" } ] }, "display_status": "Usable as labelled approximate census-based figures; review the county definition and final website presentation." }