Public ArcGIS FeatureServer endpoint for McHenry County parcel data. URL, supported fields, and a working sample query, copy it, or open it directly in the UrbanKit parcel lookup tool.
This page is the endpoint reference. If you came here to find a specific property, the McHenry County parcel search runs this same layer in your browser, no account and no API key.
Search McHenry County parcels →https://services1.arcgis.com/6iYC5AXXYapRVNzl/arcgis/rest/services/McHenry_County_TaxParcels/FeatureServer/0Field by field, whether any endpoint we index for McHenry County answers it, and the evidence for each. We only call a field restricted when there is a stated reason we can cite. Everything else here is a fact about the services we index, not a claim about the law.
| Field | Status | Basis |
|---|---|---|
| APN | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Owner name | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Owner mailing address | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Site address | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Geometry | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| Land use | Not published | No endpoint we index for this county documents this field, so a query cannot ask for it. That is a fact about the services we index, not a legal restriction, and not a statement that the county holds no such record. Where to request it. |
| Zoning | Not published | No endpoint we index for this county documents this field, so a query cannot ask for it. That is a fact about the services we index, not a legal restriction, and not a statement that the county holds no such record. Where to request it. |
ParcelNumberParcel NumberOwnerOwnerSiteAddressSite AddressSiteAddressCitySite Address CityMailToAddress1Mailing Address (line 1)curl -s 'https://services1.arcgis.com/6iYC5AXXYapRVNzl/arcgis/rest/services/McHenry_County_TaxParcels/FeatureServer/0/query?where=UPPER(Owner)%20LIKE%20UPPER('%25SMITH%25')&outFields=ParcelNumber,Owner,SiteAddress,SiteAddressCity&returnGeometry=false&f=json&resultRecordCount=10'https://services1.arcgis.com/6iYC5AXXYapRVNzl/arcgis/rest/services/McHenry_County_TaxParcels/FeatureServer/0/query?where=UPPER(Owner) LIKE UPPER('%SMITH%')&outFields=ParcelNumber,Owner,SiteAddress,SiteAddressCity&returnGeometry=false&f=json&resultRecordCount=10Open this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| ParcelNumber | Parcel Number | YES |
| Owner | Owner | YES |
| SiteAddress | Site Address | YES |
| SiteAddressCity | Site Address City | YES |
| MailToAddress1 | Mailing Address (line 1) | YES |
| PropertyClass | Property Class | NO |
McHenry County (northernmost Illinois collar county, bordering Wisconsin; county seat Woodstock, pop. 315,000) includes Crystal Lake, Elgin (partial), and the Fox River corridor. The legacy on-prem server at mchenrycountygis.org/arcgis/rest/services/parcels/MapServer was firewalled (HTTP 403) in early 2026. The replacement is now hosted on the county's ArcGIS Online open-data hub at data-mchenrycountygis.opendata.arcgis.com, with the McHenry_County_TaxParcels FeatureServer (services1.arcgis.com/6iYC5AXXYapRVNzl) as the canonical public endpoint. The license is 'open-data', permitting unrestricted use. Roughly 150k parcels, 50+ fields including ParcelNumber, Owner (owner name, searchable via UPPER() LIKE), MailToAddress1, MailToAddress2, MailToCity, MailToState, MailToZip, SiteAddress, SiteAddressHouseNumber, SiteAddressStreetName, SiteAddressStreetType, SiteAddressSuffix, SiteAddressCity, SiteAddressZip, PropertyClass, TaxStatus, and taxing-district assignment fields (Library, ParkDistrict, FireDistrict, GradeSchoolDistrict, HighSchoolDistrict). Owner field exposes the legal owner name; MailToAddress reflects the billing addressee, which may differ for trusts and entities. The open-data hub at data-mchenrycountygis.opendata.arcgis.com has bulk download links for the same dataset.
McHenry County GIS, https://data-mchenrycountygis.opendata.arcgis.com/
McHenry County's McHenry County TaxParcels layer exposes a parcel identifier (Parcel Number), owner names (Owner), and address fields (Site Address, Site Address City, Mailing Address (line 1)). Use it for owner-name lookups and address-based parcel searches. 5 of 6 listed fields accept queries; the rest are returned on read but not indexed for search. Served as an ArcGIS FeatureServer layer, so edits and applyEdits operations are technically exposed (read access only is published here); last verified 2026-05-15.
/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 McHenry County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
services1.arcgis.com serves McHenry County, Illinois parcels over public ArcGIS REST, but, like most county servers, it may not send the CORS headers a browser needs for a cross-origin fetch. If a direct browser call fails, the layer still works from curl, Postman, or a server-side script; the UrbanKit parcel lookup tool proxies the request, so a search that succeeds there confirms the layer is genuinely public.
We last verified McHenry County's FeatureServer layer on 2026-05-15. County GIS teams move services without notice, so if you hit a fresh 404, tell us and we'll re-check. Atlas entries are re-verified on a rolling basis.
McHenry County's layer is hosted on Esri ArcGIS Online. Public ArcGIS endpoints rarely rate-limit individual reads, but services1.arcgis.com can throttle heavy automated traffic at the host level. Page through results with resultOffset / resultRecordCount and request only the fields you need. There's no API key and no charge from the county.