Public ArcGIS MapServer endpoint for Contra Costa County parcel data. URL, supported fields, and a working sample query — copy it, or open it directly in the UrbanKit parcel lookup tool.
https://gis.cccounty.us/arcgis/rest/services/CCMAP/Assessment_Parcels_ArcPro/MapServer/0/query?where=N_CTY_ST+LIKE+'CONCORD%'&outFields=APN,N_STR_NM,N_STR_NBR,N_CTY_ST,LAND_VALUE,IMP_VAL,ACREAGE&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| APN | Assessor Parcel Number | YES |
| N_STR_NM | Situs Street Name | YES |
| N_STR_NBR | Situs Street Number | NO |
| N_CTY_ST | Situs City/State | YES |
| N_ZIP | Situs ZIP | NO |
| LAND_VALUE | Land Value | NO |
| IMP_VAL | Improvement Value | NO |
| TRA | Tax Rate Area | NO |
| USE_CODE | Use Code | NO |
| ACREAGE | Acreage | NO |
42 fields confirmed including APN, APN_CHECK, TRA, N_STR_NM, N_STR_SUF, N_ODD_EVN, N_STR_NBR, N_FRAC, N_APT_NBR, N_CTY_ST, N_ZIP, N_ZIP_EXT, DESC_, VIEW_, ACREAGE, C_DED_NBR, C_DED_DT, USE_CODE, LAND_VALUE, IMP_VAL, PER_PRPTY, TOT_AREA, XMP_CODE1, XMP_AMT1. Live query confirmed: N_CTY_ST LIKE 'CONCORD%' returns real Concord CA parcels (APN='510052007', LAND_VALUE=512317). NOTE: Owner name is NOT on this public layer per CA Gov Code 7928.205. The CCMAP Assessment Parcels service is the county-maintained assessor parcel layer for Contra Costa County (Concord, Richmond, Walnut Creek, Antioch, etc.). Hosted on the county's GIS server (gis.cccounty.us). The main CCMAP MapServer (/CCMAP/CCMAP) has no external query layer. maxRecordCount=2000. Capabilities: Map, Query, Data.
Contra Costa County GIS / CCMAP — DOIT GIS Division — https://contra-costa-gis-cocogis.hub.arcgis.com/
/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.