Understanding your APN

APN stands for Assessors Parcel number. Parcel numbers are assigned to areas of land by the county assessor for the purpose of identification and tracking. Maps, showing the parcel numbers, are maintained in map books by the county assessor. A San Bernardino County Assessors Parcel Number is a string of 13 digits encoded as follows:

• First four digits: Map Book Number.
• Next three digits: Block Number (the first two digits are the page number).
• Next two digits: Parcel Number
• Last four digits: Normally zero, used to identify separate interests when a parcel is subdivided as in a condominium

The following diagram shows a portion of a parcel map. The block number is 201 and the parcel numbers are written inside circles.