1 county indexed. ArcGIS FeatureServer and MapServer URLs, with supported search fields per layer.
| County | Endpoints | Searchable fields | Status | Action |
|---|---|---|---|---|
| Ada County | 1 | Parcel Number · Property Address · Address Number +1 | LIVE | OPEN |
Idaho property assessment is handled by elected Assessors in each of the state's 44 counties. The Idaho State Tax Commission sets valuation standards and oversees the assessment process but does not operate the parcel data itself — county Assessors own their source records and publish REST layers independently. Idaho parcel identifiers vary by county; Ada County (Boise metro) uses a 10-character alphanumeric code (e.g., R5983390030) rather than a standard APN format. The public REST layer for Ada County exposes geometry, parcel number, address, and assessed value, but withholds owner names under Idaho Code 74-120, which restricts distribution of name-and-address lists without individual consent.
The Idaho Geospatial Office (IGO), operating under the Idaho Information Technology Authority, coordinates GIS strategy across state agencies and supports the Idaho Geospatial Council (IGC). INSIDE Idaho, hosted at the University of Idaho, serves as the state's geospatial data clearinghouse recognized by the IGC. The IGO has been advancing a statewide parcel framework initiative to get all 44 counties contributing parcel data to a unified dataset, though adoption is voluntary and county participation varies. The Idaho Map Open Data portal (the-idaho-map-open-data-idaho.hub.arcgis.com) hosts a statewide parcel layer aggregated from participating counties, but completeness and update cadence differ by county. For counties not in the statewide aggregation, endpoint discovery requires checking individual county Assessor websites.
Ada County's public parcel FeatureServer omits owner name and mailing address fields. Idaho Code 74-120 (the Idaho Public Records Act) prohibits distributing name-and-address lists for mailing purposes without consent from each person listed. Ada County and several other Idaho counties cite this statute when excluding OWNERNAME from their public REST layers. For ownership lookups, the county Assessor's online property portal (assessor.adacounty.id.gov) provides individual parcel searches but does not expose a bulk query API. If you need owner data for multiple parcels, a public records request to the county Assessor is the documented path.
Ada County uses a 10-character parcel number (e.g., R5983390030) stored in the PARCEL field. The leading letter indicates property type: R for residential, C for commercial, M for manufactured home. There is no statewide standardized APN format in Idaho — neighboring counties use different digit lengths and encoding schemes. When querying the Ada County FeatureServer, use the PARCEL field for ID lookups. The separate field PROPADDNUM (address number) and PROPSTNM (street name) allow address-component queries when you do not have the parcel number.
Idaho offers a homeowner exemption that reduces the assessed value of an owner-occupied primary residence. The HOMEEXEMPT field in Ada County's REST layer records the exemption amount (in dollars, not as a percentage). TOTALVALUE is the pre-exemption assessed value; subtract HOMEEXEMPT to estimate the taxable value for a homestead parcel. For non-residential parcels, HOMEEXEMPT is zero. Idaho reassesses annually, so PROPYEAR identifies which assessment year the record reflects. The CODEAREA field encodes the tax code area — a composite of overlapping taxing districts — which determines the mill rate applied to that parcel.
Ada County (Boise metro, pop. ~500,000; state capital) is the most populous county in Idaho. The public FeatureServer at services2.arcgis.com exposes PARCEL, ADDRESS, TOTALVALUE, ZONING, ACRES, HOMEEXEMPT, and CODEAREA, but not owner name. Address queries work via PROPADDNUM and PROPSTNM. For ownership, use assessor.adacounty.id.gov.
Ada County address search: ?where=UPPER(PROPSTNM)+LIKE+UPPER('%25MAIN%25')&outFields=PARCEL,ADDRESS,CITY_STATE,TOTALVALUE,ZONING,ACRES&returnGeometry=false&f=json&resultRecordCount=10 (base: services2.arcgis.com/dgGjZc6xAH5m5JyP/arcgis/rest/services/Parcels/FeatureServer/5). Parcel number lookup: ?where=PARCEL='R5983390030'&outFields=*&returnGeometry=false&f=json. Subdivision search: ?where=UPPER(SUBNM)+LIKE+UPPER('%25HIGHLAND%25')&outFields=PARCEL,ADDRESS,SUBNM,TOTALVALUE&returnGeometry=false&f=json. HOMEEXEMPT filter: ?where=HOMEEXEMPT>0&outFields=PARCEL,ADDRESS,TOTALVALUE,HOMEEXEMPT&returnGeometry=false&f=json&resultRecordCount=25.
Last updated 2026-05-24.
1 Idaho county is indexed in the UrbanKit atlas with a verified public REST endpoint: Ada. They index by parcel ID and address; owner lookups go through the county assessor or appraiser.
Ada publishes parcels at https://services2.arcgis.com/dgGjZc6xAH5m5JyP/arcgis/rest/services/Parcels/FeatureServer/5 — a FeatureServer (layer 5). It indexes by Parcel Number, Property Address, Address Number, and Street Name.
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