Blog · October 14, 2026 · New York
Ontario County Plat Book: finding and using one
If you're looking near Border City, plat books show ownership by township; the parcel viewer shows it today.
Main page: Ontario County, NY GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Hunting for the latest Ontario County plat book? A plat book shows owners and tract lines on township pages, useful for farms near Canadice. In this Ontario County guide: how the atlas is organized, where to find editions, and the free online map that stays current.
The Ontario County plat book: start here
Near Canandaigua, a plat book is a privately published atlas, that map ownership across the countryside, usually township by township.
Pulling up a parcel
Your first stop is the Ontario County parcel viewer; it includes each tax parcel from Canadice to Centerfield. When a rural tract has no street number, follow the nearest road on the aerial and click the parcel itself, whether the land is near Border City or elsewhere in the county. For a home near Border City, copy the parcel ID before closing the panel; each records desk in the county asks for it first.
Reading the legal description
Tracts outside towns near Cheshire are often described by metes and bounds, listing bearings, distances and landmarks. Town lots near East Bloomfield refer to a recorded plat, which is simpler to follow. Write down the legal description for the tract near Canandaigua for any title or survey request.
Editions and availability
Editions come and go depending on publishers, try the county extension office, recorder's office or library near Bristol.
Printing your own
Screenshot each section of the viewer around Canandaigua and keep them in a binder for the truck.
Who uses plat books
Buyers and seed dealers around Centerfield rely on them to see ownership across many tracts at once.
Who handles what
Questions about value or the owner field for land near Centerfield go to the county Real Property Tax Services office, since that office keeps the assessment data. Questions about what you can build around Centerfield go to planning, building or health offices, town or county, depending on location.
Where the recorded documents are
With a lot near Centerfield, the map is an index, not the title: deeds, plats and easements for parcels in the county are kept by the County Clerk. Long-held tracts near Canandaigua can trace back through a long string of deeds, and a title company can sort it out on a real sale.
The free online alternative
Click a parcel near Centerfield for owner and acreage, and save it for your own township pages.
Not the same thing
For property near Geneva, don't confuse the atlas with a recorded subdivision plat: the recorded plat at the County Clerk is a legal document, and the atlas is just a guide.
Getting your bearings
Canandaigua serves as the county seat, which is where the courthouse records live. You'll also find Bristol, Canadice, East Bloomfield, and Farmington. Around 112,494 people live in Ontario County (Census Bureau estimate, 2023) on about 644 square miles. Ontario County dates to 1789, and some chains of title near Fishers are long.
Land on the county line
Ontario County meets Livingston County, Monroe County, Seneca County, Steuben County, and Wayne County, all with their own assessor records. A tract near the line by Cheshire can be split in two county records, so open the neighboring map before you assume the acreage. For a tract near East Bloomfield, the Platbookmapper state page lists every neighboring county map for New York.
Taking the map into the field
Most viewers work in a phone browser, useful out on a road near Canandaigua, so load it before you lose signal. A printout of the tract near Cheshire helps when you meet an owner or agent.
What the map can't tell you
Out toward East Bloomfield, acreage on the record is an estimate; only a licensed surveyor establishes the real lines on the ground. For property near Farmington, records update in batches, so a deed recorded last month may not show yet.
Quick answers
Why does the plat book differ from the deed near Bristol?
For a home near Gorham, the deed and a survey decide; don't rely on them for boundaries.
Are old plat books online near Geneva?
For property near Centerfield, libraries and historical societies hold older editions; call ahead.
Is a plat book the same as a recorded plat near Centerfield?
For property near Fishers, a survey sets boundaries, not an atlas; check the deed.
Is there a current Ontario County plat book?
Out toward Fishers, editions come and go; ask local offices.
Why don't the lines match my fence near Border City?
In and around Gorham, parcel lines are tax drawings, not surveys; a survey sets the real corners
Open the official Ontario County, NY parcel map See it in the Platbookmapper directory
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.