To find a property ID, start with paperwork you already have: a property tax bill, a recorded deed, or an assessment notice will show the number in plain view. If you don’t have those, search your county assessor’s online property portal by address or owner name, or click the parcel on the county’s GIS map. When neither works, call the county assessor’s office and a records clerk can usually give you the number over the phone from the property address.
The number goes by different names depending on where the property sits. Assessor’s Parcel Number (APN) is the most common, but you’ll also see Parcel Identification Number (PIN), Assessor’s Identification Number (AIN), Folio Number, Tax Map Number, or a Map and Lot designation.1Property Records Industry Association (PRIA). Parcel Identification Number – FAQs The label varies; the function does not. Every parcel gets one unique number, and no two parcels in the same jurisdiction share it.
Check the Documents You Already Have
Before you search anything, look through your files. The property ID sits in predictable spots on documents most owners already keep.
- Property tax bill. The parcel number is usually near the top of the bill or next to the amount owed. This is the fastest source.
- Notice of assessment. When the assessor changes your property’s assessed value, the parcel ID is printed prominently so you can confirm the valuation matches the right parcel.
- Recorded deed. On a warranty deed or quitclaim deed, look near the beginning of the legal description or inside the recording stamp the county clerk applied at filing.
- Title insurance commitment. Schedule B lists the parcel number alongside the real estate tax exceptions tied to that specific parcel.
- Mortgage or deed of trust. Federal rules require the Closing Disclosure to identify the property by address, but the parcel number is not always on that form. The recorded mortgage or deed of trust filed alongside the closing typically does show it inside the legal description.2eCFR. 12 CFR 1026.38 – Content of Disclosures for Certain Mortgage Transactions (Closing Disclosure)
Read carefully before copying anything down. Some documents reference more than one parcel, particularly closings that involve adjacent lots or bundled sales.
Search the County’s Online Portal
Most counties run a free property search portal through the assessor’s or treasurer’s office. On the county government website, look for a link labeled “Property Search,” “Parcel Lookup,” or “Tax Records.”
Search by Address
Type the full street address, including directional indicators (North, South, East, West) and any unit or apartment number. Leaving those out often returns the wrong parcel or no result at all. When the correct property comes up, the detail page shows the parcel identification number along with assessed value, tax history, and often links to recorded documents. Many portals let you print a property record card that summarizes the parcel’s data on one page.
Search by Owner Name
If you don’t have the address, search by the current owner’s legal name. Common names may return several results, so you’ll need to verify which listing matches the property you’re researching. Owner-name searches also surface parcels a person owns that don’t have a street address, which matters for vacant land.
Use the GIS Map
Most assessor sites offer a Geographic Information System (GIS) map viewer. You can pan and zoom to the area you care about and click directly on a parcel to see its number and other property details. This is the practical approach for vacant lots and rural land that may not have a standard mailing address. Parcel boundaries appear on the map even when nothing else about the property is indexed by address.
When the Property Has No Address
Vacant land and rural parcels often lack a formal address. A few workarounds:
- Legal description. An old deed or survey may describe the parcel by metes and bounds, lot and block, or township, range, and section. You can enter that information into the assessor’s search tools or bring it to the office.
- Adjacent parcels. If you know a neighboring property’s address, look it up first. The GIS map will show surrounding parcels, and you can identify your target by its position relative to the neighbor.
- Owner name. A name search returns everything on the tax roll under that owner, including land with no address.
Call the Assessor or Recorder
When the online portal is down, incomplete, or the records aren’t digitized, call the county directly. Two offices hold property records, and they handle different questions.
County Assessor
The assessor identifies every taxable parcel, assigns parcel numbers, and sets assessed values. Call this office to get a parcel number, verify one, or ask about assessment and tax information. A records clerk can generally provide a parcel number over the phone once you give them the address. Complex requests, such as tracing a parcel through old records or finding a number for recently subdivided land, may take a few business days.
County Recorder or Register of Deeds
The recorder holds the recorded documents that affect real property: deeds, mortgages, liens, easements. Go here for copies of a recorded deed containing the parcel number. The recorder doesn’t assign numbers, but the documents on file will show them.
Confirming a parcel number for a known address is generally free at either office. Certified copies of deeds and other recorded documents carry fees that vary widely, typically from a few dollars to over $40 per document depending on the county and page count. Check the office website or call ahead before visiting.
The Number Can Change
A parcel number is not necessarily permanent. The assessor issues new numbers when the physical boundaries of a parcel change. Common triggers:
- Subdivision. When one parcel is divided into multiple lots, each new lot gets its own number.
- Lot merger. When adjacent parcels are combined, the old numbers retire and a single new number is issued.
- Boundary adjustment. If part of one parcel moves to a neighbor, both affected parcels may receive new numbers.
Processing time varies. Some assessors update the roll within weeks; others take several months, especially during annual tax roll preparation. If you’re waiting on a new number after a land division, call the assessor for an estimated timeline. Older documents will still reference the previous number, so researching a property’s history sometimes means tracing the chain of prior parcel numbers through assessor records to connect current data to older filings.
Why the Right Number Matters
Using the wrong parcel number on a deed, mortgage, or tax payment causes problems that are harder to fix than to prevent.
On a deed, a wrong parcel number can create uncertainty about what property was actually conveyed. A minor typo, where the legal description and address clearly identify the correct property, is usually a nonmaterial error correctable by a corrective affidavit. When the wrong number creates real ambiguity about which parcel changed hands, the error is material and may require a corrected deed or a court order reforming title before the property can be sold or refinanced.
On a tax payment, an incorrect parcel number sends the money to the wrong property. The correct parcel then shows unpaid taxes, accrues interest, and can eventually face a tax lien. Fixing this is not always simple, particularly if either property has changed hands or if the county issued a tax clearance based on the misdirected payment. Some jurisdictions have limited authority to move payments between parcels once applied.
Mortgages, mechanics’ liens, and judgment liens filed against the wrong parcel number can fail to attach to the intended property, leaving the lender or claimant without an enforceable interest in the correct land.
The safest practice is to cross-reference the parcel number against at least two independent sources, such as a tax bill and the county assessor’s portal, before using it on any legal or financial document.