If you’re buying land in Tamil Nadu, or already own some, you’ll eventually need the survey number to search records, apply for documents, or confirm a deed matches what you’re buying. This is for anyone holding a patta, deed, or sketch who isn’t sure where the survey number sits on it, or what to do when it comes with a subdivision like 181/5A2. By the end, you’ll know exactly where to look on each document type, and why dropping part of the number can send your search to the wrong parcel.
What is a survey number?
A survey number is the identifier the Tamil Nadu survey and revenue departments assign to a parcel of land within a village, created when the village’s land was surveyed and divided into numbered blocks. Every patta, chitta, and A-Register entry for rural land is filed against one or more of these numbers, because rural parcels in Tamil Nadu usually have no door number or lane name of their own — the survey number does that job instead. It is unique only within its village: the same number repeats in other villages, so you’ll always see a village and taluk name travel alongside it. Think of it as the parcel’s file number in revenue and survey records, not an address.
Where does it appear on documents?
The survey number appears in the schedule or property-details section of whichever document you already hold, usually near the top alongside the village name, taluk, and extent (area, typically in hectares and ares). This holds whether the document was issued by the revenue side or the survey side, and it holds for older documents too — a settlement deed from decades ago follows the same convention. Check whichever of these you already have before requesting anything new: the survey number is almost certainly already sitting in a document in your hands.
- Patta or chitta — property-details section, beside the village name and extent
- Sale deed or settlement deed — the schedule describing the property and its boundaries
- FMB or TSLR sketch — printed beside the parcel outline and in the sketch index
- A-Register extract — the account entry recorded against that number
How do subdivisions like 181/5A2 arise?
Subdivisions appear when a survey number’s original extent is split, typically because the land was sold in parts or divided among heirs in a partition. When that happens, the survey office breaks the original number into sub-numbers — 5A, 5A1, 5A2, and so on — with each sub-number identifying one of the resulting smaller parcels rather than the whole original block. A number like 181/5A2 therefore tells you that survey number 181 was subdivided, and that 5A2 is one specific slice of it — not the entire original parcel. Over time, one survey number can carry several such subdivisions as land keeps changing hands, so the subdivision suffix is doing real identifying work, not decorating the base number.
Why keep the subdivision number attached?
Keep the subdivision suffix attached because it is what narrows a shared base number down to your specific parcel — drop it and you are searching for the wrong slice of land, or for a block that once existed but has since been split among several owners. A search on ‘181’ alone, when your parcel is actually ‘181/5A2’, can return no result, a different owner’s parcel, or the pre-subdivision record that no longer matches what you hold. This is the single most common reason a survey number search comes back wrong: not a wrong number, but an incomplete one with the slash and everything after it missing.
Do town plots use different numbers?
Town plots use a different system entirely — a town-survey number, assigned within notified town-survey areas rather than rural patta villages. These parcels are recorded in TSLR (Town Survey Land Register) documents instead of the rural patta and A-Register combination, and the TSLR extract or sketch is where the town-survey number appears, again usually near the top alongside the ward and block details. If your property sits inside a town or city limit rather than a rural revenue village, look for a town-survey number on your TSLR paperwork rather than expecting a rural-style survey number at all.
What if the number is missing?
If you know the location, try the free Survey Number Finder. Paste coordinates or a Maps link containing them to check the available cadastral data. The result includes its source and positional confidence; confirm the number against your documents before relying on it.
If the number is missing or illegible on what you have, ask the seller, the document writer who prepared the deed, or the local survey or taluk office for the exact number as it appears in the deed schedule. Don’t guess it from a neighbouring plot’s number or from a number printed on a map or a broker’s listing — adjoining parcels often carry different subdivisions of the same base number, and a map label is not a substitute for the number in an actual record. Getting the base number right but the subdivision wrong is enough to send your search to someone else’s land.
