Public ArcGIS MapServer endpoint for Union 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 Union County parcel search runs this same layer in your browser, no account and no API key.
Search Union County parcelsHave a street address but not the parcel number? Find the parcel number by address.
https://www7.co.union.oh.us/unioncountyohio/rest/services/ParcelAllSaleinfoBuildingInfo/MapServer/1Field by field, whether any endpoint we index for Union 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 | Answered | Documented in a field list on an endpoint we index. Not every row is populated. |
| 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. |
ParcelNoParcel NumberDeedOwnerOwner NameAddressSite Addresscurl -s 'https://www7.co.union.oh.us/unioncountyohio/rest/services/ParcelAllSaleinfoBuildingInfo/MapServer/1/query?where=ParcelNo+%3D+%272900080920000%27&outFields=ParcelNo,DeedOwner,Address,city,ZipCode,MailAddress1,MailAddress2,Mailaddress3,appraisedTotalValue,Acreage,classDescription,saleDate,salePrice&returnGeometry=false&f=json'
https://www7.co.union.oh.us/unioncountyohio/rest/services/ParcelAllSaleinfoBuildingInfo/MapServer/1/query?where=ParcelNo+=+'2900080920000'&outFields=ParcelNo,DeedOwner,Address,city,ZipCode,MailAddress1,MailAddress2,Mailaddress3,appraisedTotalValue,Acreage,classDescription,saleDate,salePrice&returnGeometry=false&f=jsonOpen this URL in a browser tab to see the raw ArcGIS JSON response.
| Field name | Label | Searchable |
|---|---|---|
| ParcelNo | Parcel Number | YES |
| DeedOwner | Owner Name | YES |
| Address | Site Address | YES |
| city | Site City | NO |
| ZipCode | Site City, State and ZIP | NO |
| MailAddress1 | Owner Mailing Address | NO |
| MailAddress2 | Owner Mailing Address Line 2 | NO |
| Mailaddress3 | Owner Mailing Address Line 3 | NO |
| appraisedTotalValue | Appraised Value | NO |
| Acreage | Acres | NO |
| classDescription | Land Use | NO |
| saleDate | Sale Date | NO |
| salePrice | Sale Price | NO |
Union County, Ohio (FIPS 39159). Served by the county's own ArcGIS Server (www7.co.union.oh.us): ParcelAllSaleinfoBuildingInfo MapServer layer 1, "Parcels", whose rows carry the auditor's parcel, sale and building columns on the parcel polygons. Informational only and not a legal record: verify with the Union County Auditor. The service is live: read on 2026-10-17, its latest saleDate was 2026-09-21. No field dates the roll itself, so lastVerified is our probe date, not a data date. The layer has 40,059 rows. 850 of them have no owner (DeedOwner is null), and 848 of those also have no site address and no appraised value: they are shapes without an auditor record, and 90 of them have no ParcelNo at all. A ParcelNo can repeat: 1,045 parcel numbers appear on more than one row (2,327 extra rows). 538 of the extra rows are ownerless shapes (342 of them under one number); the other 1,789 are owned rows, at most 25 under one number, and in 26 of the 30 largest such groups the rows differ by building (yearBuilt or LivingArea) or unit. So a parcel-number lookup can return several rows for one parcel. Share of the layer's rows filled, read 2026-10-17: DeedOwner 97.9%, Address 97.2%, city 97.1%, ZipCode 97.7%, MailAddress1 97.4%, classDescription 97.9%, appraisedTotalValue above zero 94.9%, Acreage above zero 58.2%, saleDate 88.6%, salePrice above zero 72.7%. ZipCode holds the site city, state and ZIP as one string ("CITY OH ZIP"), not a bare ZIP, so match a ZIP with LIKE. Mailing address: MailAddress1 is the street line (25 of 25 and 25 of 25 values street-like, a house number or a PO Box, in two samples on 2026-10-17). MailAddress2 is "CITY ST ZIP" on most rows; on the 114 rows that fill Mailaddress3 it is a second street line, and the city, state and ZIP are in Mailaddress3. The layer pages with resultOffset and resultRecordCount and returns up to 2,000 rows per request; the parcel-number sample answered in 3.5 s. CORS: the server echoes the request Origin, so browser tools call it directly. License: unknown. No license text is published on this service, its layer or its portal item. The county's sister parcel items (ArcGIS Online item 846fd2f9957d4c15a5c56875d0a11d38 and portal item 39e4e8e7d52f4780b924a6b084eef7d2) carry the Union County GIS disclaimer: "information contained within the Union County GIS web program was prepared to assist in the appraisal of real property for tax purposes. Map features and related data may not reflect most recent changes. Union County assumes no legal responsibility or liability for the information contained within the Union County GIS web program." It places no limit on use. The county's GIS data page (the licenseUrl) offers the parcels as a free shapefile download (Property_Parcels.zip) with no fee, license or disclaimer text.
Union County Auditor (GIS / M.A.P.S.), https://unioncountyohio.gov/GIS-Mapping
Union County's Parcels layer exposes a parcel identifier (Parcel Number), owner names (Owner Name), and address fields (Site Address). Use it for owner-name lookups and address-based parcel searches. 3 of 13 listed fields accept queries; the rest are returned on read but not indexed for search. Served as an ArcGIS MapServer layer, which supports query operations but not write operations; last verified 2026-10-17.
/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 Union County actually publishes, not what you might expect from a national standard (there isn't one).
For background, see What is an APN?
www7.co.union.oh.us serves Union County, Ohio 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 Union County's MapServer layer on 2026-10-17. 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.
Union County's layer is hosted by the county on www7.co.union.oh.us. Public ArcGIS endpoints rarely rate-limit individual reads, but www7.co.union.oh.us 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.