Public ArcGIS FeatureServer endpoint for Maui County parcel data. URL, supported fields, and a working sample query — copy it, or open it directly in the UrbanKit parcel lookup tool.
https://services1.arcgis.com/x4h61KaW16vFs7PM/arcgis/rest/services/Parcels_2024_Owners/FeatureServer/196OWNEROwner Nametmk_txtTax Map Key (TMK / APN)TMK_1Tax Map Key (alternate)curl -s 'https://services1.arcgis.com/x4h61KaW16vFs7PM/arcgis/rest/services/Parcels_2024_Owners/FeatureServer/196/query?where=OWNER+LIKE+'%25SMITH%25'&outFields=OWNER,tmk_txt,TMK_1&returnGeometry=false&f=json&resultRecordCount=10'
https://services1.arcgis.com/x4h61KaW16vFs7PM/arcgis/rest/services/Parcels_2024_Owners/FeatureServer/196/query?where=OWNER+LIKE+'%SMITH%'&outFields=OWNER,tmk_txt,TMK_1&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| OWNER | Owner Name | YES |
| tmk_txt | Tax Map Key (TMK / APN) | YES |
| TMK_1 | Tax Map Key (alternate) | YES |
Maui County HI (the islands of Maui, Molokai, and Lanai; county seat Wailuku; FIPS 15009; pop. ~165,000) publishes a public ArcGIS Online FeatureServer parcel layer (Parcels_2024_Owners/FeatureServer/196, no token required). Hawaii uses the Tax Map Key (TMK) system: tmk_txt and TMK_1 hold the TMK (APN equivalent). Key fields: OWNER (owner name — searchable, already stored UPPERCASE), tmk_txt / TMK_1 (TMK). IMPORTANT — owner search must use OWNER LIKE '%NAME%' WITHOUT UPPER(): this layer returns HTTP 400 if UPPER() is applied to the field, and the data is already uppercase so no case folding is needed. CAVEAT: multi-owner parcels are duplicated — the layer has one row per owner, so the ~141,239 feature count exceeds the number of unique parcels; dedupe on tmk_txt when counting distinct parcels. Verified 2026-06-20: OWNER LIKE '%SMITH%' returns Maui/Molokai/Lanai parcels.
County of Maui — GIS Division — https://www.mauicounty.gov/1933/GIS-Maps
Maui County's Parcels 2024 Owners layer exposes a parcel identifier (Tax Map Key (TMK / APN)) and owner names (Owner Name). Use it for owner-name lookups and PIN-keyed record pulls. All 3 listed fields accept queries. Served as an ArcGIS FeatureServer layer, so edits and applyEdits operations are technically exposed (read access only is published here); last verified 2026-06-20.
/query?where=…&outFields=*&f=jsonto the URL. The sample query above is a working example you can paste into a browser tab to see the raw JSON response.Counties publish parcel data through their own ArcGIS Server installations, each with its own schema. One county uses APN, another uses PIN, a third uses PARCEL_ID. Some expose owner names; others keep them on a separate assessor's portal. The searchable fields list above reflects what Maui County actually publishes — not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
Many county servers allow public reads but block browser cross-origin requests. The UrbanKit parcel lookup tool fetches directly from your browser; if it works there, the layer is technically public. For your own integration, you may need a same-origin proxy or server-side fetch.
Possibly — counties move services without warning. We re-verify entries weekly and flag stale ones. If you're seeing a fresh 404, please let us know and we'll update the listing.
Most are. Public ArcGIS layers don't typically rate-limit individual reads, but heavy programmatic use can trigger throttling at the host level. Be respectful — query what you need.