Blog · October 14, 2026 · Illinois
Using a Washington County Plat Book today
For acreage around Irvington, plat books show ownership by township; the parcel viewer shows it today.
Main page: Washington County, IL GIS & Parcel Viewer (official map link, county facts and neighboring maps).
Platbookmapper is an Amazon Associate. If you buy through an Amazon link on this page, we earn a commission. The link is a product, not the county map.
Want a copy of the Washington County plat book? It's a printed atlas of landownership, usually by township, and it's handy for land around Centralia. What this county guide covers: how the atlas is organized, where to find editions, and the free online map that stays current around Cordes.
The Washington County plat book: start here
For a tract near Elkton, plat books are commercial atlases, that map ownership across the countryside, page by page across the county.
The viewer Washington County publishes
Parcels around Beaucoup appear on the Sidwell Portico - Washington County IL, which opens without registering. For acreage around Nashville, type a street address, an owner's name or a parcel number, and the viewer zooms to the match. On ground around Clarmin, save the parcel ID from that panel; every office in the county will want it.
A homemade atlas
Print parcel views near Irvington township by township to build your own up-to-date atlas.
Field tips
The parcel map usually runs in a mobile browser, useful out on a road near Elkton, so load it before you lose signal. A printout of the tract near Ashley helps when you meet an owner or agent.
Before you lean on the lines
On ground around Elkton, listed acreage is a tax-roll number; just a licensed surveyor establishes the real corners on the ground. With a lot near Du Bois, owner names and values update on a schedule, so a deed recorded last month may not show yet.
A quick look at the area
Nashville serves as the county seat, where most land records are kept. You'll also find Ashley, Centralia, Addieville, and Du Bois. Around 13,536 people call Washington County home (Census Bureau estimate, 2023) spread over some 563 square miles. The county dates to 1818, which matters when you trace an old farm's title for land near Beaucoup.
Editions and availability
Not every county has a current edition, check with local offices and farm stores near Nashville.
Who uses plat books
Farmers, hunters and appraisers near Hoyleton use plat books to see ownership across many tracts at once.
Getting answers from the right desk
If the acreage or value on a parcel near Du Bois looks off are handled by the Supervisor of Assessments, working with township assessors, since that office keeps the assessment data. Questions about what you can build around Addieville are for the local planning and health departments, and the answer depends on jurisdiction.
Land on the county line
The county meets Clinton County, Jefferson County, Marion County, Perry County, and Randolph County, and each of those keeps its own parcel map around Centralia. Acreage along the edge near Elkton may be split in two county records, so check the neighboring map too. If you're looking near Clarmin, the Platbookmapper state page lists each neighboring county map for Illinois.
The free online alternative
For current names, use the Sidwell Portico - Washington County IL, including rural land around Cordes.
Sections, lots and bearings
Illinois uses the Public Land Survey System, so rural legal descriptions near Du Bois cite section, township and range. A standard section is about one square mile, roughly 640 acres, with 36 sections to a township, though corrections make some sections near Beaucoup odd-sized. Copy the legal description from the record for the parcel near Irvington for any title or survey request.
Where the recorded documents are
The map is an index, not the title: deeds, subdivision plats and easements covering ground around Huegely are filed with the county Recorder of Deeds (in many counties the County Clerk and Recorder). For land near Clarmin, use the document number listed on the parcel record to skip a name search.
Atlas or legal document
Don't confuse the atlas with a recorded subdivision plat: recorded plats near Ashley are filed with the county Recorder of Deeds (in many counties the County Clerk and Recorder), while the atlas is a reference.
Quick answers
How accurate are plat book acreages for land near Cordes?
Near Addieville, plat book acreage and lines are approximate; don't rely on them for boundaries.
How do I research old landowners near Centralia?
If the land is near Hoyleton, libraries and historical societies hold older editions; availability varies.
Should I use the Sidwell Portico - Washington County IL instead?
Short answer: the Sidwell Portico - Washington County IL is free and updated more often.
Where can I buy a plat book for land near Centralia?
If the land is near Irvington, it depends on whether a publisher has a current edition.
Is there an app for the parcel map near Du Bois?
For a tract near Irvington, most viewers run in a mobile browser, though rural signal can drop.
Open the official Washington 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.