Blog · October 14, 2026 · Ohio
Reading the Union Plat Map for a lot
A recorded plat shows how land near Tipp City was divided into lots.
Main page: Miami County, OH GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When a listing near Laura mentions a lot number, you'll need the Union plat map to make sense of it. This Union guide covers: where plats are filed, how a plat differs from a parcel map, and the details that matter to buyers.
Who keeps the Union plat map
Closer to Ludlow Falls, recorded plats sit with the County Recorder, usually in a plat book or cabinet.
Where the parcel data lives
Lots and tracts near Potsdam can be looked up on the Miami County ArcGIS parcel map, which opens without registering. If you only know roughly where the land is, zoom in from Huber Heights until the lines appear, then click inside the one you want. If the land is near Laura, the record panel typically gives the owner of record, assessed acreage, the parcel number and in many cases the last transfer.
City limits and county records
Union lies within Miami County, Ohio, so its parcels are on the county's map. If you're looking near Huber Heights, City or town hall handles things like zoning, permits and utilities for lots inside the boundary, while the county keeps the tax map. Acreage past the town limits near Ludlow Falls generally follows county rules, not municipal ones.
On site with the map
Most viewers work in a phone browser, which helps when you're standing on land near Laura, so load it before you lose signal. A printout of the tract near Ludlow Falls keeps working without signal.
Neighboring parcel maps
Miami County borders Champaign County, Clark County, Darke County, Montgomery County, and Shelby County, and each of those keeps its own parcel map. A tract near the line by Potsdam can show up across two assessors' files, so look at the neighboring map before you assume the acreage. For acreage around Laura, the Platbookmapper state page links each bordering county map across Ohio.
Amended plats
Lots near Laura can be combined or reconfigured by a replat, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
Miami County in a few facts
Troy holds the county offices, which is where the courthouse records live. Other places on the map include West Milton, Ludlow Falls, Tipp City, and Potsdam, where town lots give way to larger tracts. About 110,876 people live in Miami County (Census estimate, 2023) spread over some 407 square miles. Miami County dates to 1807, and some chains of title near Laura are long.
The paper trail behind a parcel
The map is an index, not the title: recorded deeds, subdivision plats and easements for land near Huber Heights are kept by the County Recorder. Older tracts near West Milton may trace back through several deeds, and a title company earns its fee on a real sale.
How a plat differs from the tax map
Where lines don't match in Union, the recorded plat and a survey control.
Who handles what
Questions about value or the owner field for land near West Milton belong with the County Auditor, which maintains the tax roll. Questions about what you can build around Potsdam need the planning or permitting office, depending on whether the land is inside town limits.
How land is described here
Tracts outside towns near Tipp City commonly use metes-and-bounds descriptions, a series of courses and distances from a starting point. Town lots near Laura are typically described by lot and block, making them easier to find. Copy the legal description from the record for the parcel near West Milton when you talk to a surveyor.
Details on the Union plat map
Easements on the plat near Tipp City limit where you can build or fence; check the plat notes and any covenants.
Ordering the Union plat map
Out toward West Milton, some counties put plat images online, while others require a visit or a request; copy fees are usually small.
Metes and bounds instead
Rural land near Laura that was never subdivided may have no plat at all; the deed and any recorded survey describe it instead.
What the map can't tell you
The acreage figure is a tax-roll number; only a licensed surveyor establishes the real lines on land around Ludlow Falls. In and around Tipp City, owner names and values update on a schedule, so a deed recorded last month might lag behind.
Questions about the Union plat map
What is a lot and block description around Tipp City?
On ground around Tipp City, the description sends you to a specific recorded plat; the deed names the subdivision.
What do the dashed lines on a plat mean near Tipp City?
For land near West Milton, dashed lines often mark easements or building lines, so check before you build.
Is the Union plat map the same as the county GIS?
Out toward West Milton, a recorded plat is based on a survey, but the GIS map is not; a surveyor ties it to the ground.
Who has recorded plats for land near Tipp City?
For acreage around Tipp City, copies come from the County Recorder, often through an online index; use the plat reference from the deed or parcel record.
Who do I call about a parcel near Ludlow Falls?
Values are the County Auditor's job; recorded documents belong to the County Recorder; planning offices cover zoning near Tipp City
Open the official Miami County, OH 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.