Definition of Assessor Parcel Number (APN)

An Assessor Parcel Number (APN) is a unique number assigned to each parcel of land by a county tax assessor. The APN is based on formatting codes depending on the home’s location. The local government uses APNs to identify and keep track of land ownership for property tax purposes.

Find Your APN

To find your home’s APN, go to your local county assessor’s office website and search for your address. There you can see information regarding your APN, lot size, home type, property tax history, and sale price history. Redfin also shows sold home APNs under Public Facts on the property details page.


  • Assessor’s Identification Number (AIN)
  • Property Identification Number (PIN)
  • Property Account Number
  • Tax Account Number

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