Blog · September 25, 2026 · Parcel numbers
Virginia GPIN and Tax Map Numbers Explained
Ask for a parcel number in Virginia and you may be handed a GPIN, a PIN, a tax map number or a “map and parcel” reference, depending on where the land sits. The labels vary because each county and independent city runs its own system. Here is how to decode what you are looking at and find the right number for your property.
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Why Virginia has so many formats
Virginia assesses real estate at the local level, and its independent cities are separate from the counties around them. That means a buyer comparing a lot in a county with one in the neighboring city is dealing with two assessors, two map systems and possibly two very different ID formats. The Platbookmapper Virginia hub lists the counties we track, and our directory currently shows a verified official map for more than 110 of the 133 localities in the state list.
GPIN: a number built from coordinates
Many Virginia localities use a GPIN, and it usually encodes a location. Prince William County calls its version a Grid Parcel Identification Number: a 10-digit number that stands for the x and y position of the parcel on the county’s grid. When a boundary changes, the county calculates a new center and a new GPIN, and it links the new record back to the “parent” number so the history can be traced. A parcel that is split by a road but held as one tract still carries a single GPIN, and the county needs the GPIN before it will issue building permits.
The City of Fredericksburg uses the same letters to mean Geographic Parcel Identification Number. Its version is a 15-digit value drawn from the coordinates of each parcel’s center, and condominium units get their own numbers. The city switched from tax map IDs to GPINs as its main identifier in September 2012.
The takeaway: two places can use “GPIN” and still mean different lengths and grids. Always copy the number exactly as the local assessor shows it.
Tax map numbers and PINs
Older systems point to a page in the local tax map book. Fairfax County’s parcel ID shows how this works. Its PIN can be up to 15 characters. The first four digits are the tax map number, identifying a grid sheet and quadrant, followed by a space and then codes for subdivision, block, lot and sub-lot. In the county’s example, 0562 08020006A1, the parcel is on tax map 56-2. The county also offers a free online parcel viewer, Fairfax County Jade, and its published PIN explanation is a useful model for decoding similar map-based IDs elsewhere in the state. Don’t confuse the county with the City of Fairfax, an independent city inside it that has its own Real Estate Assessment Office and city GIS. Because a “Fairfax” mailing address can fall in either one, confirm which jurisdiction a parcel is in before you search.
Other counties print a “map parcel” or “tax map parcel” number that mixes a map sheet, a block letter and a lot number, often with dashes or spaces. On a GIS viewer, try it with and without the punctuation.
Why the number matters at closing
The Code of Virginia (section 17.1-252) says that where a locality uses a unique parcel identification system, the circuit court clerk requires the tax map reference number or PIN to appear on the first page of a deed or on a cover sheet, and the clerk may index records by that number. In practice, that means title companies and attorneys will ask you for it, and a typo can slow recording. Pull the number from the assessor’s record rather than an old listing sheet.
Where to find your number
- Tax bill or assessment notice. The number is almost always printed near the top.
- Local GIS or real estate search. Search by address or owner, then click the parcel. Our directory links the official map for each county we have verified.
- Deed. Newer deeds carry the number on the first page, as the Code requires in many localities.
- Permit or planning records. Localities that key permits to GPINs show the number on applications and inspection records.
When the number changes
Because many GPINs are built from a parcel’s center point, a boundary adjustment, subdivision or consolidation produces a new number. That is normal and does not mean ownership changed. If an old survey or listing uses a number the county no longer recognizes, search by address or owner, or ask the assessor for the parent-child history. Our article Do parcel numbers change? covers this in more depth.
Who uses these numbers
Northern Virginia home buyers run into GPINs and PINs during closings. Builders need them for site plans and permits. Land shoppers in the Blue Ridge and Shenandoah Valley use them to confirm acreage and zoning before calling a seller. Hunters looking for landowners in rural counties can use the number to pull the owner’s mailing address from the assessment record. For county walkthroughs, see our guides to Loudoun, Fauquier, Albemarle and Warren counties.
A parcel number identifies land for taxes and records, but it does not fix the boundary. For line questions, rely on a recorded plat and a licensed Virginia surveyor.
Frequently asked questions
What does GPIN stand for in Virginia?
It depends on the locality. Prince William County uses Grid Parcel Identification Number; Fredericksburg uses Geographic Parcel Identification Number.
Is a GPIN the same as a tax map number?
Not always. Some localities replaced tax map numbers with GPINs; others still use map-based PINs.
Why did my Virginia GPIN change?
Coordinate-based GPINs are recalculated when a parcel’s boundary changes, for example after a split or merge.
Does a Virginia deed need the parcel number?
In localities with a unique parcel ID system, state code requires the tax map number or PIN on the first page or a cover sheet.
Open the Platbookmapper county map Browse the county GIS directory by state
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey — especially for fences, setbacks, or boundary disputes.