Loudoun County, VA
parcel GIS REST API.

No public parcel REST endpoint we can serve for Loudoun County.

No public REST endpoint we can serve

Loudoun County's public parcel layers have parcel keys, street and subdivision fields but no owner names or mailing addresses, so we don't index it. The Commissioner of the Revenue's property search shows owners one parcel at a time. Request it and we'll tell you if that changes.

Checked 2026-11-01. Request it below and we’ll tell you if that changes.

How to find an ArcGIS parcel layer URL

Notes

Loudoun County, Virginia (FIPS 51107). The county's public parcel layers on logis.loudoun.gov (LMIS_ParcelsPlatfile, 132,900 parcels on 2026-11-01; LandRecords Parcel Boundaries; Parcels4DIT) and on its ArcGIS Online organisation (Loudoun Parcels System Links, 132,940 parcels) carry parcel keys, street addresses and subdivision fields only, with no owner name or mailing address. Owner names are shown one parcel at a time on the Commissioner of the Revenue's Real Estate Information Site, which can be searched by parcel ID, address or tax map number but not by owner name and has no query service. For parcel and owner records, use that site or contact the Commissioner of the Revenue, realestate@loudoun.gov, (703) 777-0260.

Source

Loudoun County Office of Mapping and Geographic Information, (703) 771-5778, https://www.loudoun.gov/mapping

Using this endpoint

What Loudoun County publishes

Loudoun County does not yet have a verified public REST endpoint in our atlas. The sections below cover patterns common to most county parcel APIs.

Two paths from URL to result

Open in Parcel Lookup: click the button on the endpoint card. The lookup tool loads the layer, auto-detects fields, and gives you a search box. No code, no API keys, just a browser.
Query directly: append /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.

Why field names vary by county

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 Loudoun County actually publishes, not what you might expect from a national standard (there isn't one).

For background, see What is an APN?

What to do with the results

Generate a public-notice mailing list: pipe the parcel layer URL into Radius Notice to buffer around an address and select neighboring owners.
Print Avery 5160 labels: export the result CSV and drop it into CSV → Labels.
Pull individual parcel records: use Parcel Lookup directly to grab zoning, assessed value, and ownership for one property at a time.

Quick FAQs

Does Loudoun County have a public parcel REST endpoint?

Not in our atlas yet. Loudoun County either runs a token-gated server or a viewer-only portal. If you know a public ArcGIS REST URL for it, add it to the request form above and we'll check it.

View all FAQs

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