To find a parcel number, look at your most recent property tax bill: the number is printed near the top of the first page, often labeled APN, PIN, Parcel ID, or Folio Number. If you don’t have a bill handy, search your county assessor’s website by street address. Every county in the United States assigns these numbers to track land for tax purposes, the records are public, and the lookup rarely takes more than a few minutes.
A parcel number is the string of digits (sometimes with letters) that your county assigns to a specific piece of land so it can be tracked on the tax rolls. A street address tells the post office where to deliver mail. A parcel number tells the county exactly which land is being taxed and where its boundaries sit. That’s why one address can map to several parcels, and vacant land can have a parcel number with no address at all.
Check the Documents You Already Have
Before going online, look through the property paperwork in your files. The number appears on several documents you likely already own:
- Your property tax bill, near the top of the first page, labeled APN, PIN, Parcel ID, or Folio Number depending on the county.
- Your recorded deed, listed near the legal description on the first page. If you don’t have a physical copy, the county recorder’s office keeps one on file.
- Your title insurance policy from closing, which references the parcel number alongside the legal description.
- Your mortgage and closing documents, including the settlement statement, though labeling varies by lender.
If you’re looking up a property you don’t own and don’t have any of these documents, move on to the public search methods below.
Search the County Assessor’s Website
Every county maintains property records that are open to the public, and most now offer online search tools. Search the web for your county’s name plus “assessor property search” or “parcel lookup.” You’ll land on a government site, usually with a URL ending in .gov or .us, where you can search by street address, owner name, or legal description.
Enter the address the way it appears on official mail, including any unit number. The results will show the parcel number along with the assessed value, lot size, and current owner of record. If the address returns no results, try dropping the street suffix (“St,” “Ave,” “Dr”) or searching by owner name instead. Small mismatches between how the county stores an address and how you type it are the most common reason a search fails.
Try the County GIS Map
Many counties also publish an interactive GIS map, sometimes linked from the assessor’s page and sometimes hosted separately. Search your county name plus “GIS map” or “interactive property map.” Zoom into the area and click on the parcel you want; a pop-up will show the parcel number, owner, and often a link to the full property record.
This is the easier path when you can see the land on a map but don’t know its exact address, which happens often with vacant lots, oddly shaped parcels, and rural acreage. Many GIS tools also let you turn on layers for zoning, flood zones, and survey boundaries if you’re doing broader research at the same time.
Call or Visit the County Office
If online tools aren’t cooperating, or you’d rather talk to a person, call or visit the county assessor’s office, recorder’s office, or tax collector’s office. Have the address or the owner’s name ready. Staff can pull the parcel number in seconds from their internal systems, and there’s usually no charge for a verbal lookup. A certified copy of a property record card or assessor’s map carries a small fee that varies by county.
Fallbacks When Nothing Works
If the county’s online search returns nothing, the address doesn’t match, and you have no documents, a few options remain. A title company can pull the parcel number as part of a title search. Real estate agents often have access to MLS and tax record systems that make the lookup straightforward. Either can usually get you the number within a business day.
For truly stubborn cases, such as unaddressed rural land or parcels in counties with limited online records, contact the assessor’s mapping department. Describe the location as precisely as you can using road names, neighboring addresses, or GPS coordinates. Mapping staff can locate the parcel on their internal maps and read you the number. In counties that still rely on physical map books, this may require an in-person visit, but it’s a solvable problem. Every taxable piece of land in the country has a parcel number.
Watch for One Address Covering Multiple Parcels
Don’t assume one address equals one parcel number. It’s common for a single property to sit on two or more parcels, especially older homes built across adjacent lots decades ago. Commercial properties frequently span several parcels assembled by a developer. In these cases, the tax bill may list multiple parcel numbers, or you may receive separate bills for each parcel under the same address.
Condominiums work the other direction: a single building parcel is subdivided into individual unit numbers within the assessor’s system. If a title search turns up an unexpected number of parcels during a purchase or refinance, ask the title company to confirm which ones are included in the transaction. Missing a parcel in a deed can create ownership gaps that are expensive to fix later.
Parcel Numbers Change When Boundaries Change
A parcel number isn’t permanent. It changes whenever the underlying land boundaries change. The most common triggers are subdivisions that split one parcel into two or more, lot mergers that combine adjacent parcels into one, and boundary line adjustments between neighbors. When any of these happens, the assessor retires the old parcel number and issues new ones.
This matters when you’re researching history. A search on the current parcel number will only return records created since the most recent boundary change. To trace earlier owners or past tax assessments, you may need the prior parcel number too. The assessor’s office can usually tell you what a parcel was called before, and some counties keep cross-reference tables linking retired numbers to their replacements. If you’re buying property and the parcel number on the seller’s older documents doesn’t match current records, a past boundary change is almost always the reason, but confirm it with the assessor before closing.
Parcel Number Is Not the Legal Description
The parcel number and the legal description are different things. A parcel number is a tax tracking tool created by the assessor. A legal description is the formal boundary definition used in deeds, title documents, and court filings, and it takes the form of a lot and block reference to a recorded subdivision map, a metes and bounds description tracing the perimeter, or a section-township-range reference for rural land.
A parcel number alone is generally not a valid legal description for a deed or other conveyance. Assessor’s parcel boundaries don’t always line up with the actual legal boundaries of the property, and parcel numbers can change, which makes them unreliable as a permanent identifier. When a deed is recorded, the legal description does the work; the parcel number rides along as a cross-reference. If you’re drafting any document that transfers or encumbers real property, use the full legal description from the most recent deed or survey rather than the parcel number.