Blog · October 14, 2026 · Washington
The Grant County Plat Book: a Washington guide
Township atlases, old editions and current owners in Grant County, starting near Ephrata.
Main page: Grant County, WA GIS & Parcel Viewer (official map link, Grant County facts and neighboring maps).
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Old copies of the Grant County plat book turn up at auctions and in kitchen drawers around Ephrata, and new ones are harder to track down. This guide covers finding a printed edition for Grant County, Washington, and using the free parcel map in the meantime.
How to use the Grant County plat book
Think of the Grant County plat book as a bound, printed version of ownership: township pages, owner names on each tract, and road maps for places like Ephrata. Don't confuse it with a subdivision plat on file for lots in Ephrata; that recorded plat is a legal document, while the atlas is a reference.
Step one: the free Grant County viewer
Grant County parcels are viewed through a statewide map, the Washington Current Parcels layer in ArcGIS Map Viewer; zoom toward George to reach them. Click any Grant County parcel near George to open its record: owner, parcel ID and assessed acreage are most commonly listed. If the official address for the Grant County, WA map ever changes, our directory page carries the current link for George and the rest of the county.
Current and older editions
Private publishers have printed plat books for many rural counties, but editions for Grant County come and go; ask at the courthouse, the extension office or a farm supply store in Mattawa. Older editions are useful for family history around Ephrata, showing who held a farm decades ago.
Atlas details and limits
Plat book pages for Grant County most commonly include an index of owners, so you can find a family name near Electric City without knowing the township. Owner names in an older Grant County edition may be decades out of date, so confirm on the county map before contacting anyone near Banks Lake South. If you use a plat book for hunting permission near Moses Lake, recheck the landowner on the county map first.
Old atlases and family history in Grant County
Farm families near Quincy commonly keep successive editions of the Grant County plat book, which together show how ownership shifted over decades. Some buyers print the county parcel map at township scale to carry on back roads near Electric City.
Work and land use in Grant County
Grant County's 2022 business count was 2,098 establishments, with retail trade, construction, and accommodation and food services the largest groups. Compared with national shares, Grant County leans toward agriculture and forestry support services and hospitals, which shapes demand for land near George.
Getting oriented in Grant County, WA
From Ephrata, the seat of the county, the map spreads out to Electric City, George, Grand Coulee, and Mattawa. Smaller places such as Banks Lake South, Beverly, and Cascade Valley appear on the county map as little clusters of lots. Census Bureau estimates put Grant County at about 102,678 residents in 2023 on about 2,680 square miles of land. Outside Electric City, most of the county map is farm, ranch or timber ground with large, irregular tracts.
Near the Grant County line
Near the edge of the county, check the next map over: Adams County, Benton County, Douglas County, Franklin County, and Kittitas County all border it. Every map bordering Grant County is listed on our Washington directory.
Current owners without a printed book
For current ownership, the free Washington Current Parcels layer in ArcGIS Map Viewer beats any printed book: owners update as deeds are processed, and you can click any parcel near Mattawa. Print a screenshot of the tracts around Mattawa if you want a paper copy in the truck.
Grant County plat book questions
Can I use a plat book to find lot lines near Mattawa?
It shows approximate ownership blocks; for lines near Mattawa, use recorded plats and surveys.
Is there a current plat book for Grant County, Washington?
Editions come and go; ask at the courthouse, extension office or farm supply stores in Mattawa.
Should I use the Grant County, Washington parcel map instead of a plat book?
For current owners near Ephrata, yes; the Washington Current Parcels layer in ArcGIS Map Viewer updates as deeds are processed.
Are older plat books for Grant County, Washington online?
Check the library in Mattawa, local historical groups and estate sales for older Grant County editions.
Is a plat book the same as a recorded plat for a lot in Mattawa?
No; a lot in Mattawa answers to its recorded plat, and the county atlas is a reference, nothing more.
Open the official Grant County, WA parcel map Grant County 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.