Query Los Angeles County parcel and assessed-value data through the County Assessor's Open Data / GeoServices API

domain: data.lacounty.gov · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗

Steps

  1. Locate the target dataset (e.g., Assessor Parcels) on the LA County Open Data Hub at data.lacounty.gov
  2. Use the dataset's provided API endpoint (GeoServices/ArcGIS REST, WMS, or WFS depending on the dataset) rather than scraping the public-facing portal.assessor.lacounty.gov search UI
  3. Query by parcel APN, address, or spatial bounding box depending on which query parameters the specific dataset's REST endpoint supports
  4. Request the desired output format (GeoJSON, CSV, etc.) directly from the API rather than exporting through the UI
  5. Cross-reference field definitions against the dataset's own metadata page, since attribute names vary by dataset and are not identical to RESO/MLS field names

Known gotchas

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