{"entry":{"slug":"us-county-housing-age-2020-2024","kind":"dataset","title":"US county housing built before 1980, 2020–2024","description":"Compare the share of housing built before 1980 across US counties and inspect the source construction-period estimates.","topic":"Housing","region":"United States","updated":"2026-11-01","preview":"/library/us-county-housing-age-2020-2024.0758ca3a7d0b.webp","assetId":"us-county-housing-age-2020-2024","sourcePage":"https://api.census.gov/data/2024/acs/acs5/groups/B25034.html","notes":["The map covers counties and county equivalents in the 50 states and the District of Columbia; it excludes Puerto Rico and other territories.","These are 2020–2024 five-year survey estimates, not measurements made on one day. Source margins of error and unavailable-value annotations are retained.","County data describes broad areas. It does not identify individual households or give exact values inside a drawn service area.","The 2024 county boundaries are transformed from NAD83 to WGS84 and simplified to 0.003 degrees for display. Small boundary details can be absent.","Derived percentages have no calculated margin of error; the source estimates and their 90% margins of error are retained.","Darker colours show larger values; grey means no estimate. Select a county to read its value and colour range.","Housing age does not describe building condition or prove that repairs are needed."],"related":["us-county-population-growth-2020-2025","us-county-household-income-2020-2024","us-county-home-ownership-2020-2024"],"preset":{"color":"#64748b","fillOpacity":0.28,"basemap":"carto","viewBounds":[-125,24,-66,50],"bounds":[-179.14671,18.91036,179.77847,71.38731]},"period":"2020–2024 ACS five-year estimates","retrieved":"2026-11-01"},"asset":{"id":"us-county-housing-age-2020-2024","version":"e85307679d51","url":"/library/us-county-housing-age-2020-2024.e85307679d51.geojson","sha256":"e85307679d51738fcb21459cc5fdf2dc9836edeae7b32184c8ab74ae905c399a","bytes":6244823,"featureCount":3144,"geometryTypes":["MultiPolygon","Polygon"],"source":{"name":"US Census Bureau","url":"https://api.census.gov/data/2024/acs/acs5/groups/B25034.html","license":"Public domain","licenseUrl":"https://www.census.gov/about/policies/quality/data_stewardship/copyright.html","attribution":"US Census Bureau. 2020–2024 American Community Survey five-year estimates and 2024 cartographic county boundaries. Prepared 1 November 2026."},"fields":[{"name":"name","description":"County or county-equivalent name."},{"name":"county_fips","description":"Five-digit Census county geographic identifier."},{"name":"built_before_1980_pct","description":"Estimated units built before 1980 divided by all housing units, as a percentage."},{"name":"B25034_E001","description":"Estimate: Total:."},{"name":"B25034_M001","description":"Margin of Error: Total: (90% confidence)."},{"name":"B25034_E002","description":"Estimate: Total:: Built 2020 or later."},{"name":"B25034_M002","description":"Margin of Error: Total:: Built 2020 or later (90% confidence)."},{"name":"B25034_E003","description":"Estimate: Total:: Built 2010 to 2019."},{"name":"B25034_M003","description":"Margin of Error: Total:: Built 2010 to 2019 (90% confidence)."},{"name":"B25034_E004","description":"Estimate: Total:: Built 2000 to 2009."},{"name":"B25034_M004","description":"Margin of Error: Total:: Built 2000 to 2009 (90% confidence)."},{"name":"B25034_E005","description":"Estimate: Total:: Built 1990 to 1999."},{"name":"B25034_M005","description":"Margin of Error: Total:: Built 1990 to 1999 (90% confidence)."},{"name":"B25034_E006","description":"Estimate: Total:: Built 1980 to 1989."},{"name":"B25034_M006","description":"Margin of Error: Total:: Built 1980 to 1989 (90% confidence)."},{"name":"B25034_E007","description":"Estimate: Total:: Built 1970 to 1979."},{"name":"B25034_M007","description":"Margin of Error: Total:: Built 1970 to 1979 (90% confidence)."},{"name":"B25034_E008","description":"Estimate: Total:: Built 1960 to 1969."},{"name":"B25034_M008","description":"Margin of Error: Total:: Built 1960 to 1969 (90% confidence)."},{"name":"B25034_E009","description":"Estimate: Total:: Built 1950 to 1959."},{"name":"B25034_M009","description":"Margin of Error: Total:: Built 1950 to 1959 (90% confidence)."},{"name":"B25034_E010","description":"Estimate: Total:: Built 1940 to 1949."},{"name":"B25034_M010","description":"Margin of Error: Total:: Built 1940 to 1949 (90% confidence)."},{"name":"B25034_E011","description":"Estimate: Total:: Built 1939 or earlier."},{"name":"B25034_M011","description":"Margin of Error: Total:: Built 1939 or earlier (90% confidence)."},{"name":"value_range","description":"Display range used for the feature colour; not an additional source estimate."}]}}