Blog · October 8, 2026 · Idaho
Washington County, Idaho: Plat Map Guide
The free official plat map for Washington County, how to search it, and what the parcel data does and doesn't tell you about owners, acreage and property lines.
Main page: Washington County, ID GIS & Parcel Viewer (official map link, Washington County facts and neighboring maps).
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Who owns that field past Cambridge? How many acres is the lot for sale near Weiser? For anywhere in Washington County, Idaho, the Washington County plat map is where those answers begin.
You'll find the viewer link, notes on Cambridge and the land around it, and short answers to common questions about property lines and land records.
What the map covers, from Weiser to the back roads
The county seat is Weiser; Cambridge and Midvale are among the other communities you can zoom to. The county was organized in 1879 and named for George Washington, so some tracts carry a long chain of deeds. For scale: roughly 1,453 square miles of land and an estimated 11,425 residents as of 2023, per the Census Bureau. Away from Cambridge, expect big ownership blocks: at this density, ranch, farm and timber tracts fill most of the map. Look for Boise National Forest and Deer Flat National Wildlife Refuge on the map; the private tracts touching them are some of the most asked-about parcels in Washington County.
How to use the Washington County plat map
Washington County's public parcel map is the Washington County ArcGIS parcel map, hosted on an Esri ArcGIS web map. For land around Midvale with no street number, zoom to the road and click the tract to open its record. Bookmark the Platbookmapper page for Washington County too; we update it when the official map moves.
How accurate are Washington County, ID property lines?
A lot line on the Washington County plat map near Cambridge is a drawing based on deeds, not a measurement taken on site. Out past Midvale, rural deeds usually cite a section, township and range, and those section lines often show on the parcel layer. For rural ground near Midvale, a recorded survey or a new one is the only reliable source for the true line.
Behind the map: land records in Washington County
For land near Cambridge, the parcel record is the index; the recorded deed is the source. Recording offices go by different titles from state to state, including register of deeds, recorder, county clerk and clerk of court; the official Washington County website names the one that handles deeds. The parcel record often lists a deed book and page or an instrument number, which is how you request a copy of the recorded deed for a tract near Cambridge.
Who needs this map
- A hunter driving the back roads near Midvale can match a promising woodlot to an owner name in seconds.
- For hobby-farm buyers near Midvale, the parcel map shows how a tract sits against its neighbors and the road.
- Rural owners near Midvale use the map to see how many acres the county has on record for them and who owns the land next door.
- Someone house hunting in Cambridge can check whether a yard really is as big as the listing implies, and who owns the open lot behind it.
Hunters: whose land is it?
Before you scout a new spot near Weiser, pull up the parcel layer and see how many owners share that stretch of woods. Hunters headed to Boise National Forest and Deer Flat National Wildlife Refuge should check where the public boundary ends; the tracts beyond it are private. Licenses and season dates for the Midvale area come from the Idaho Department of Fish and Game. In the field near Cambridge, respect posted signs and painted boundaries even where the map line looks different.
The Washington County economy in brief
Census business counts for 2022 list 226 establishments in Washington County; construction tops the list, with retail trade and accommodation and food services close behind. The local economy leans harder than average on wood product manufacturing, heavy and civil engineering construction, and specialty trade contractors. That points to working timberland, so check whether a wooded parcel in Washington County has been cut recently or is enrolled in a forestry program.
Before you rely on the data
A lot in Weiser that sold last month may still show the previous owner on the map. For a rural tract near Midvale, get acreage from a survey, not the tax record, if it matters for a deal.
Common questions
Does the Washington County parcel map show where I can hunt?
Use it to find the owner of a woodlot near Midvale, then ask; the map itself grants no hunting rights.
How do I find property lines in Washington County, Idaho?
The Washington County ArcGIS parcel map gets you to the parcel; the recorded plat or deed gives the dimensions; a licensed surveyor marks the corners.
Where can I get a Washington County plat book?
Whether a current printed edition exists for Washington County varies; the free online map covering Cambridge and the rest of the county is the dependable option.
How can I tell who owns land near Cambridge?
Owner names for parcels from Cambridge to Midvale are on the Washington County ArcGIS parcel map; search by address or click the map.
Open the official Washington County, ID parcel map Washington 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.