Blog · October 14, 2026 · Illinois
Montgomery Plat Map, Illinois: plats and lots
A recorded plat shows how land near Millbrook was divided into lots.
Main page: Kendall County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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When a listing near Oswego mentions a lot number, the Montgomery plat map is where those numbers come from. Covered here for Montgomery: where to request a copy, plat versus tax map, and what to look for on the sheet.
The Montgomery plat map: start here
For land around Plano, the deed usually cites the plat; bring that to the recorder's office or its online index.
Getting to the right map
Your first stop is the Kendall County parcel viewer; it covers each assessed parcel from Aurora to Yorkville. Without an address in hand, zoom in from Oswego until the lines appear, then click inside the one you want. If the land is near Millbrook, the parcel card normally shows the owner of record, assessed acreage, the parcel number and often a sale date.
Replats and vacations
An amended plat may change lots around Aurora, so check for later filings; street vacations near Plano show up in the records too.
Getting answers from the right desk
Questions about value or the owner field for land near Millbrook go to the Supervisor of Assessments, working with township assessors, since that office keeps the assessment data. Building or septic questions for a lot near Plainfield go to planning, building or health offices, depending on whether the land is inside town limits.
Montgomery, IL: the basics
Montgomery sits in Kendall County, Illinois, which means parcel data comes from the county. If the land is near Oswego, the municipality handles things like zoning, permits and utilities for lots inside the boundary, and the county still keeps the parcel and deed records. Lots just outside the town limits out by Plano generally answers to county rules, not municipal ones.
How a plat differs from the tax map
The tax map on the Kendall County parcel viewer is a summary, but the recorded plat is what the deed relies on.
Limits of the parcel data
The acreage figure is an assessed number; just a licensed surveyor can set the real lines on land around Aurora. Owner names and values update on a schedule, so a fresh transfer around Oswego might lag behind.
Places you'll see on the map
Yorkville is the county seat, which is where the courthouse records live. You'll also find Oswego, Aurora, and Plainfield. Roughly 139,976 people call Kendall County home (Census estimate, 2023) across roughly 320 square miles. Kendall County was organized in 1841, so old deeds can run back a long way.
Using it on a phone
The parcel map usually runs in a mobile browser, handy when you're parked on a road near Millbrook, so load it before you lose signal. A screenshot of the parcel near Oswego with its ID helps when you meet an owner or agent.
Where the recorded documents are
The map is an index, not the title: recorded deeds, plats and easements for land near Plainfield sit with the county Recorder of Deeds (in many counties the County Clerk and Recorder). For a home near Plano, have ready the document number listed on the parcel record and the lookup takes minutes.
Legal descriptions in Illinois
Illinois is laid out under the Public Land Survey System, so deeds around Plano reference sections and townships. Each section is nominally a mile square, about 640 acres, and a township holds 36 of them, though real sections near Plano vary in size. Copy the legal description from the record for the parcel near Oswego before you request a deed or survey.
Reading the plat sheet
Closer to Millbrook, the sheet usually includes lot and block numbers, dimensions and bearings, street rights-of-way and easements.
Requesting the plat
For a parcel near Aurora, many recorder offices offer an online index, otherwise call or visit with the reference; copy fees are usually small.
Land outside a subdivision
Acreage around Plano outside a subdivision may have no plat at all; look for a recorded survey for land there.
Land on the county line
Kendall County touches DeKalb County, DuPage County, Grundy County, Kane County, and LaSalle County, all with their own assessor records. Ground near Oswego that runs to the line may be split across two assessors' files, so look at the adjacent map too. For property near Plainfield, our state page links each bordering county map across Illinois.
Frequently asked
Are old plats online near Plano?
For most people, the county Recorder of Deeds (in many counties the County Clerk and Recorder) can say what's available; call before you visit.
What is a lot and block description near Yorkville?
If you're looking near Yorkville, the description sends you to a specific recorded plat; the deed names the subdivision.
Is a plat map a survey for land near Millbrook?
Closer to Plano, GIS parcels are tax drawings, and the recorded plat is the legal document; trust the plat when they differ.
What is a replat for land near Oswego?
Short answer: combining or splitting lots near Millbrook usually needs a recorded plat change.
What's a legal description in Montgomery?
It's the formal description of the land in the deed, and the parcel record often summarizes it.
Open the official Kendall County, IL 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.