Public ArcGIS MapServer endpoint for Hamilton County parcel data. URL, supported fields, and a working sample query — copy it, or open it directly in the UrbanKit parcel lookup tool.
https://cagisonline.hamilton-co.org/arcgis/rest/services/HCE/Cadastral/MapServer/0/query?where=UPPER(OWNNM1)+LIKE+UPPER('%SMITH%')&outFields=PARCELID,OWNNM1,OWNNM2,OWNAD1,AUDPCLID&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| PARCELID | Parcel ID | YES |
| AUDPCLID | Auditor Parcel ID | YES |
| OWNNM1 | Owner Name (Primary) | YES |
| OWNNM2 | Owner Name (Secondary) | YES |
| OWNAD1 | Owner Address Line 1 | YES |
| OWNAD1A | Owner Address Line 1A | YES |
| OWNAD2 | Owner Address Line 2 (City, State ZIP) | NO |
| TAXDST | Tax District | NO |
| LGLDS1 | Legal Description Line 1 | NO |
| LGLDS2 | Legal Description Line 2 | NO |
| BOOK | Deed Book | NO |
| PAGE | Deed Page | NO |
99 fields confirmed. This is the CAGIS (Cincinnati Area Geographic Information System) cadastral parcel polygon layer. Key fields include: PARCELID (12-digit parcel ID), AUDPCLID (auditor parcel ID), OWNNM1/OWNNM2 (owner names), OWNAD1/OWNAD1A/OWNAD2 (owner address), LGLDS1/LGLDS2/LGLDS3 (legal description), PREVOWN1/PREVOWN2 (previous owners), BOOK/PAGE (deed reference), TAXDST (tax district), MLTOWN (municipality), GRPPCLID (group parcel ID), PNTPCLID (point parcel ID), PROPTYID (property ID). Condo layers are separate (layers 5 and 6). Layer 2 (Hamilton County Parcel Attributes) joins assessment data. Layer 0 is the polygon geometry with ownership. Owner query confirmed: UPPER(OWNNM1) LIKE '%SMITH%' returns real parcels. Hamilton County, OH is the Cincinnati metropolitan area (FIPS 39061).
CAGIS (Cincinnati Area Geographic Information System) — Hamilton County Auditor — https://www.hamilton-co.org/auditor/maps
/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 this 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.