Blog · October 14, 2026 · Missouri
Pacific Plat Map, Missouri: plats and lots
A recorded plat shows how land near Clarkson Valley was divided into lots.
Main page: St. Louis County, MO GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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If a legal description for land in Pacific cites a lot number, the Pacific plat map is where those numbers come from. This Pacific guide covers: where plats are filed, how a plat differs from a parcel map, and what to look for on the sheet.
Who keeps the Pacific plat map
For a lot in Pacific, the deed usually cites the plat; use it to request a copy.
Opening the official parcel viewer
Your first stop is the St. Louis County ArcGIS parcel map; it maps every tax parcel from Eureka to Wildwood. Out toward Ballwin, enter a street address, an owner's name or a parcel number, and the matching parcel lights up. If the land is near Wildwood, the record panel normally shows the owner of record, assessed acreage, the parcel number and in many cases the last transfer.
Pacific and the county around it
Pacific sits in St. Louis County, Missouri, and the county assessor maps its lots. For acreage around Eureka, city or town hall handles matters such as zoning, permits and utilities within town limits, while the county keeps the tax map. Acreage past the city limits near Eureka generally follows county rules instead.
Amended plats
Lots near Clarkson Valley can be combined or reconfigured by a replat, search the index for replats of the same subdivision; vacated streets or alleys also get recorded.
How a plat differs from the tax map
If the tax map and plat differ near Wildwood, the recorded plat and a survey control.
Getting your bearings
If you're looking near Eureka, clayton is the county seat, home to the main records offices. You'll also find Eureka, Wildwood, Ellisville, and Clarkson Valley. For land near Ellisville, about 987,059 people call St. Louis County home (Census estimate, 2023) spread over some 508 square miles. St. Louis County dates to 1812, and some chains of title near Wildwood are long. Landmarks such as Spanish Lake Park and Babler State Park are easy to spot when you zoom out from Clarkson Valley.
Who handles what
Anything recorded against property around Clarkson Valley are with the Recorder of Deeds, sometimes only in person. Building or septic questions for a lot near Ballwin go to planning, building or health offices, town or county, depending on location.
Next door to St. Louis County
On ground around Ellisville, st. Louis County meets Madison County, IL, Monroe County, IL, St. Clair County, IL, Franklin County, and Jefferson County, all with their own assessor records. Acreage along the edge near Wildwood may show up across two assessors' files, so open the adjacent map as well. If you're looking near Ballwin, our state page lists every neighboring county map across Missouri.
Deeds, plats and who keeps them
The map is an index, not the title: deeds, plats and easements covering ground around Winchester sit with the Recorder of Deeds. Closer to Wildwood, have ready the book and page from the tax record to skip a name search.
Reading the plat sheet
Recorded easements around Clarkson Valley can block a shed or pool; check the plat notes and any covenants.
Requesting the plat
For a parcel near Winchester, many recorder offices offer an online index, while others require a visit or a request; small fees are common.
Using it on a phone
Most viewers work in a phone browser, handy when you're parked on a road near Ellisville, so load it before you lose signal. A screenshot of the parcel near Eureka with its ID keeps working without signal.
Before you lean on the lines
Acreage on the record is an estimate; only a licensed surveyor sets the real boundary for a parcel near Wildwood. Out toward Ellisville, records update in batches, so a deed recorded last month might lag behind.
Land outside a subdivision
Rural land near Eureka that was never subdivided may have no plat at all; the deed and any recorded survey describe it instead.
Sections, lots and bearings
Missouri uses the Public Land Survey System, so deeds around Ellisville reference sections and townships. Each section is nominally a mile square, about 640 acres, with 36 sections to a township, though corrections make some sections near Wildwood odd-sized. Write down the legal description for the tract near Ellisville before you request a deed or survey.
Quick answers
What is a lot and block description around Wildwood?
Near Wildwood, lot and block refer to a numbered lot within a block on a recorded subdivision plat, so pull that plat for dimensions.
What do the dashed lines on a plat mean around Clarkson Valley?
With a lot near Ballwin, recorded plat easements usually show on the sheet, so check before you build.
Are old plats online near Ballwin?
Usually, older plats near Eureka may be on film or paper, including older subdivisions.
Who has recorded plats for land near Winchester?
Recorded plats near Winchester are filed with the Recorder of Deeds; small copy fees are common.
Why don't the lines match my fence near Ellisville?
No; boundary questions near Wildwood need a licensed surveyor.
Open the official St. Louis County, MO 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.