What Is an APN? How to Look Up Any Parcel

Updated October 29, 2026 · 3 min read

Every listing we post includes an APN, and for good reason. The Assessor's Parcel Number is the one piece of information that pins down exactly which piece of dirt you are buying.

What it is

An APN, sometimes called a parcel number or AIN, is a unique code the county assigns to every parcel for tax and record-keeping. In our area it looks like a string of digits such as 0633-122-19. No two parcels share one, so it removes any doubt about which lot a listing refers to.

Why it matters

Street addresses on raw land are often approximate or missing, and two lots on the same road can look identical. The APN is exact. With it you can pull the official parcel map, confirm the size and boundaries, check the zoning, and see the tax history, all before you ever drive out.

How to look one up

  • Find the county: our parcels are in San Bernardino County or Riverside County.
  • Open that county assessor or GIS parcel viewer, a free public website.
  • Search the APN exactly as written. The map will zoom straight to the parcel and its boundaries.

Every one of our listings already shows the parcel on an interactive map, so you can see the exact boundaries without hunting for the county site. Browse the listings to try it, or ask John if you want help reading a specific parcel.

Ready to find your parcel?

Call John: (562) 355-9579