Blog · October 14, 2026 · Wisconsin
St. Croix County Plat Book, Wisconsin: what to know
In and around Hammond, plat books show ownership by township; the parcel viewer shows it today.
Main page: St. Croix County, WI GIS & Parcel Viewer (official map link, county facts and neighboring maps).
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Looking for a St. Croix County plat book? It's a printed atlas of landownership, usually by township, and it's handy for land around Emerald. This county guide covers: how the atlas is organized, where to find editions, and the free online map that stays current, at least around Emerald.
Tracking down a St. Croix County plat book
For a home near Houlton, a plat book is a privately published atlas, with owner names on each tract, page by page across the county.
The free map to start with
Go first to the St. Croix County Beacon site; it covers every assessed parcel in the county, Hammond included. If you only know roughly where the land is, follow the nearest road on the aerial until the lines appear, then click inside the one you want, and that holds around Boardman too. On ground around Emerald, the record panel normally shows the owner of record, assessed acreage, the parcel number and sometimes recent sales.
How land is described here
Wisconsin is laid out under the Public Land Survey System, so deeds around Hammond reference sections and townships. A standard section is about one square mile, roughly 640 acres, and a township holds 36 of them, though sections near Burkhardt can be irregular. Copy the legal description from the record for the parcel near Deer Park for any title or survey request.
St. Croix County in a few facts
Hudson holds the county offices, home to the main records offices. Smaller places on the map include Glenwood City, New Richmond, River Falls, and Baldwin, each with its own cluster of lots. About 96,763 people call St. Croix County home (Census estimate, 2023) on roughly 722 square miles. St. Croix County was formed in 1849, which matters when you trace an old farm's title.
Recorded documents worth pulling
If the land is near Emerald, the map is an index, not the title: deeds, plats and easements for parcels in the county are filed with the Register of Deeds. Long-held tracts around Hudson may sit on many deeds, and a title company can sort it out before a purchase.
Where to look for one
Older editions near River Falls turn up in libraries and historical societies, which helps when tracing a farm's history.
Getting answers from the right desk
Questions about value or the owner field for land near Glenwood City belong with the county real property listing office, the office behind the parcel record. Questions about what you can build around Boardman need the planning or permitting office, town or county, depending on location.
A homemade atlas
Screenshot each section of the viewer around Boardman and keep them in a binder for the truck.
Using it on a phone
Most viewers work in a phone browser, useful out on a road near Houlton, though signal can drop in rural spots. A saved image of the lot near Centerville and its lines is a good backup.
Using the parcel viewer instead
The St. Croix County Beacon site is updated more often than any atlas, for tracts near Centerville.
Before you lean on the lines
With a lot near Burkhardt, listed acreage is an estimate; only a licensed surveyor can set the real lines on the ground. Out toward Hudson, records update in batches, so a deed recorded last month can take weeks to appear.
Common uses
Buyers and seed dealers around Houlton rely on them to see ownership across many tracts at once.
Atlas or legal document
For a tract near Centerville, don't confuse the atlas with a recorded subdivision plat: the recorded plat at the Register of Deeds is a legal document, and the atlas is just a guide.
Land on the county line
The county touches Washington County, MN, Barron County, Dunn County, Pierce County, and Polk County, and each of those keeps its own parcel map around Glenwood City. Ground near Houlton that runs to the line can be split across two assessors' files, so look at the neighboring map too. With a lot near Hammond, the Platbookmapper state page links every bordering county map across Wisconsin.
Quick answers
Is a plat book legal proof for land near Deer Park?
Out toward Hudson, a survey sets boundaries, not an atlas; check the deed.
How accurate are plat book acreages around Houlton?
For acreage around River Falls, plat book acreage and lines are approximate.
Should I use the St. Croix County Beacon site instead?
In most cases, the county Beacon site is free and updated more often; a printed atlas is still handy offline around Hudson.
Where can I buy a plat book for land near River Falls?
For a tract near New Richmond, editions come and go.
Why do offices ask for the parcel ID for land near Hammond?
It's the number the county real property listing office uses to track a tract near New Richmond; you'll see it in the viewer and on tax statements.
Open the official St. Croix County, WI 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.