An assessor’s parcel number (APN) is the unique identification number that a local tax assessor’s office assigns to every piece of real property so it can be taxed, tracked, and tied to an owner in the public record. You’ll see it printed on your property tax bill, your deed, and your title insurance policy, and you can look it up for free on your county assessor’s website using the property address.
How to Read the Number
Most APNs are built in segments that zoom from a wide area down to a single lot. The first segment usually corresponds to a map book number covering a neighborhood or district. The next segment points to a specific page within that book. The last segment identifies the individual parcel on that page. A number written as 123-45-678 reads as book 123, page 45, parcel 678.
Formats vary by county. Some jurisdictions use purely numeric sequences; others add letters to handle complex subdivisions or dense developments. A nine-digit number in one county may look nothing like a twelve-character code in the next, but the logic is the same: broad area first, specific lot last.
Other Names for the Same Number
“Assessor’s Parcel Number” is the dominant term in western states. Elsewhere the same concept travels under different labels. You may see it as a Property Identification Number (PIN), a Parcel ID (PID), a folio number, a tax map number, or an account number. In parts of the Midwest and Northeast, Property Index Number is more common. The format and name differ, but the function is identical: uniquely identifying a parcel within its jurisdiction for tax and record-keeping purposes.
If you’re researching a property in an unfamiliar area and don’t see a field labeled APN, scan for any of these alternatives on the assessor’s website or the tax bill.
Where to Find Your Parcel Number
The fastest source is your property tax bill. The APN is printed near the top of the statement, usually next to the assessed value and the property address. If the bill isn’t handy, several other documents carry the number.
- Your grant deed or warranty deed lists the APN alongside the legal description, typically in the upper portion of the document or within the body text.
- Your title insurance policy includes the APN as part of the property identification in the legal description section.
- Your deed of trust or mortgage shows the APN on the recorded security instrument, as a reference alongside the full legal description.
- A preliminary title report from a pending transaction lists the APN early in the document.
One place not to rely on: the federal Closing Disclosure form that borrowers receive at settlement does not require the APN. The regulation governing that form mandates the property address but does not list the parcel number as a required field.1eCFR. 12 CFR 1026.38 – Content of Disclosures for Certain Mortgage Transactions (Closing Disclosure) Some lenders print it anyway as a courtesy, but it may not be there.
If none of these documents are available, you can request a copy of your recorded deed from the county recorder’s office for a small per-page fee.
Looking Up a Parcel Online
Nearly every county now runs a free online portal where you can search by property address or owner name. These are typically operated by the county assessor or a Geographic Information System (GIS) department. Searching “[county name] assessor parcel search” or “[county name] GIS map” will usually get you to the right page.
Once you pull up a parcel, most portals display an interactive map showing boundaries over aerial photography, plus a data panel with the current assessed value, owner name, lot dimensions, and sometimes zoning or flood zone information. Many systems also show assessment history over prior years. Some portals let you click directly on the map to select a parcel, which is useful when you want a neighboring lot and don’t have the address.
Basic lookups are free and require no account. Certified copies of plat maps or detailed assessment reports may carry a fee, and bulk data access for commercial users runs higher. If the portal doesn’t return a result, calling the assessor’s office with the property address will get you the number.
An APN Is Not a Legal Description
This is the point that trips people up most. An APN identifies a parcel for tax purposes. A legal description defines the actual physical boundaries of the property. They do different jobs, and treating them as interchangeable can void a deed or make a mortgage unenforceable.
Legal descriptions come in three main formats. A metes and bounds description traces the perimeter from a starting point using compass bearings and distances. A lot and block description references a recorded subdivision plat by lot number, block number, and subdivision name. The rectangular survey system, used primarily in western states, divides land into townships, sections, and ranges on a grid. Any of these places the property on the ground.
An APN does not. Courts have held that a parcel number alone does not necessarily demonstrate the actual physical location of a property, because assessor’s maps need not correspond with the actual legal divisions or boundaries of land. A deed of trust that relies solely on an APN for its property description can be ruled void. The safe practice is to always include a full legal description on any conveyance document, with the APN listed as a supplementary reference. When a legal description and an APN conflict in a recorded document, the legal description controls.
The same caution applies to the maps on an assessor’s online portal. Those maps approximate boundaries for tax administration. They are not a licensed survey, and if you need to know exactly where your property line falls, you need a surveyor.
When a Parcel Number Changes
An APN stays with a piece of land through ownership changes. Buying or selling the property does not generate a new number. The number changes only when the land itself is physically reconfigured.
- When a property is subdivided into two or more separate parcels, the original APN is retired and new numbers are assigned to each resulting lot. The old number is not reused.
- When adjacent parcels under the same ownership are combined, the original numbers are canceled and a single new APN is created. Mergers typically require matching ownership, contiguous boundaries, no delinquent taxes, and parcels within the same tax rate area.
The assessor’s mapping division handles the reassignment. If you’re planning a split or a merger, contact the assessor’s office early. Keep in mind that the parcel reconfiguration is for assessment purposes only and does not change the legal lot status. You’ll still need approvals from the planning or land use department for the subdivision or merger itself.
Condominiums and Vertical Parcels
The parcel system was built for horizontal land, but it adapts to vertical ownership. When a condominium development is created, the developer records a declaration dividing the building into individual units and shared common elements such as hallways, garages, and roofs. Each unit then receives its own APN, separate from the underlying land parcel. Common elements are typically assigned to a master parcel or divided proportionally among unit owners.
A 200-unit condo building can therefore generate more than 200 individual APNs, each carrying its own assessed value and tax bill. The numbering often appends extra digits or a letter suffix to a base parcel number to distinguish one unit from the next. If you own a condo, your APN identifies your specific unit, not the building or the land beneath it. That separate number is also what allows you to sell your unit independently of every other unit in the building.
Fixing a Wrong APN on a Deed
An incorrect APN on a recorded deed is more common than people expect, and it needs to be corrected. The legal description controls over the parcel number, but a mismatched APN creates confusion in the assessor’s records, can delay transactions, and may cause title search errors later.
The standard fix is a corrective deed, sometimes called a correction deed or deed of correction. This document restates the original deed’s terms with the corrected APN and references the original deed by its recording date and document number. It does not replace the original deed or transfer any new interest. It simply adds a correction to the public record. For minor typos, some county recorder’s offices allow re-recording the original deed with the correction made directly on the document’s face and an explanatory cover page.
Procedures vary by county, so check with your local recorder’s office before preparing the document. A corrective deed that fixes only a clerical error such as a wrong parcel number is generally exempt from transfer taxes, since no actual transfer of ownership is occurring. If you discover the error during an active transaction, the title company or closing attorney will usually handle the correction as part of the title clearance process.