Land records guide
What is a plat map?
A plat map is an official, recorded drawing that divides a piece of land into numbered lots and blocks. It is one of three land documents people mix up all the time, the others being a parcel map and a survey. This guide explains what a plat actually shows, how it differs from the other two, and where to find one, because knowing which document you are looking at changes what you can trust it for.
What a plat map shows
A plat is created when raw land is divided, most often when a developer subdivides a larger tract into buildable lots. A licensed surveyor lays out the division, and the plat is recorded with the county so it becomes part of the permanent legal record. Once recorded, individual lots can be sold by referring to the plat, for example "Lot 7, Block 2 of the Meadowbrook subdivision," instead of a long metes-and-bounds description.
A recorded plat typically shows:
- Lot lines and dimensions: the boundary of each lot, with the length of each side and often the bearing.
- Lot and block numbers: the labels that let a deed reference a lot without describing its shape.
- Streets and rights-of-way: the roads being dedicated to the public, with their widths.
- Easements: strips reserved for utilities, drainage, or access, which limit what an owner can build there.
- Dedications and common areas: land set aside for parks, stormwater, or public use.
- The surveyor's certification and the approvals and recording stamps that make it official.
Plat vs. parcel map vs. survey
These three documents overlap enough to blur together, but they answer different questions and carry different weight. The short version: a plat is the recorded instrument that created the lots, a parcel map is a reference layer showing current boundaries, and a survey is a fresh measurement of one property on the ground.
| Document | What it is | Who makes it | What to trust it for |
|---|---|---|---|
| Plat map | The recorded legal drawing that divides land into lots and blocks. | A surveyor, recorded by the county. | How a subdivision was legally laid out, including easements and dedicated streets. |
| Parcel map | A reference map of current property boundaries, keyed to parcel numbers. | The county assessor, auditor, or GIS office. | Roughly where boundaries and ownership sit today, for tax and lookup. Not a precise survey. |
| Boundary survey | A field measurement of one property, marking its actual corners. | A licensed land surveyor, on site. | Exactly where a property line falls on the ground. The authority for a fence or a dispute. |
The practical rule that follows: a parcel map is great for orientation and research, a plat tells you how the lots were set up and what is encumbered, and only a survey settles where a line truly is. Reaching for the wrong one is how boundary surprises happen at closing.
Where to get a plat map
Most plats and parcel maps are public records, and many counties now put them online for free:
- County recorder or clerk: the office where plats are filed. Search by subdivision name or the recording reference on a deed.
- County auditor, assessor, or GIS office: usually runs a public parcel viewer where you can find a property by address or parcel number and see its boundary and parcel data.
- A title company: pulls the recorded plat and related documents as part of a purchase, so a copy often comes with a title commitment.
Fees vary. Many counties post recorded plats and parcel maps at no charge; others charge a small per-page copy fee for a certified copy.
The honest bridge: parcel boundaries are not plats
This is the part worth being precise about, because plenty of tools blur it. AgriTerra shows parcel boundaries with acreage, soil, water, flood, and revenue data. Ohio and Indiana have pre-loaded parcel boundaries you can tap, and there is modeled data in all 50 states with the parcel outlined on the map. That is a parcel and analysis layer, and it is genuinely useful for understanding what a piece of ground is and what it can do.
It is not a recorded plat, and AgriTerra does not claim to provide plats. A plat is a specific recorded instrument that lives at the county recorder, and a parcel boundary is a reference outline. They are different documents, and a decision that turns on legal lot lines, easements, or dedications should rest on the recorded plat and, where lines matter, a survey. We say this plainly because the difference is easy to gloss over and expensive to get wrong.
To keep the vocabulary straight, see how sections and legal descriptions work, how to calculate acreage from a boundary, how big an acre is, and how much an acre of land costs.
Plat maps: frequently asked questions
- What is a plat map?
- A plat map is an official, recorded drawing that divides a piece of land into numbered lots and blocks, usually when a subdivision is created. It shows lot lines and dimensions, streets, easements, and any land set aside for public use, and it is filed with the county recorder so it becomes part of the legal record.
- What is the difference between a plat map and a parcel map?
- A plat is a recorded legal document created when land is divided, and it governs how the lots were laid out. A parcel map is a working map, usually maintained by a county assessor or GIS office, that shows current property boundaries for tax and reference purposes. The parcel map draws on plats and deeds, but it is a reference layer, not the recorded instrument itself.
- Is a plat map the same as a survey?
- No. A survey is a licensed surveyor measuring a specific property on the ground and marking its corners. A plat can be the recorded product of a survey when land is subdivided, but a plat covers the whole subdivision, while a boundary survey answers where one property line actually falls. If you need to know your exact corners, you need a survey, not a plat.
- Where can I get a plat map?
- Start with the county recorder or clerk, where plats are filed, and the county auditor, assessor, or GIS office, which usually publishes a searchable parcel viewer online. Many counties post recorded plats and parcel maps for free; others charge a small copy fee. A title company also pulls these during a purchase.
- Does AgriTerra provide plat maps?
- No. AgriTerra shows parcel boundaries with acreage, soil, and revenue data, and pre-loaded parcel boundaries in Ohio and Indiana, with modeled data in all 50 states. That is a parcel and analysis layer, not a recorded plat. For a recorded plat, go to the county recorder. Parcel boundaries and plats are different instruments, and it matters which one a decision rests on.
See the parcel, not just the paperwork.
Pull a parcel's boundary, acreage, soil, and revenue options from federal data, free. Pre-loaded parcel boundaries in Ohio and Indiana; modeled data in all 50 states.