Parcel / APN (Assessor's Parcel Number)

A parcel is one legally defined piece of land, and the APN (Assessor's Parcel Number) is the unique identifier a county assessor assigns to that parcel for tax and records purposes. The APN — sometimes called a parcel number, PIN, or folio number depending on the county — is the most reliable way to tie a permit to a specific property, because street addresses change, get mistyped, or cover multiple units.

Many permit feeds publish a parcel/APN field alongside the address. Where a source provides it, PermitStack preserves it in the normalized record, which lets you join permits to assessor or tax data and reconcile permits that share a fuzzy address. When an APN is missing, address matching is the fallback — which is why our property-history lookup matches on a normalized street address rather than assuming a clean parcel key.

See per-property permit timelines on the property history page. Related: jurisdiction.