Blog · October 14, 2026 · Oregon
Union County Plat Book in Oregon
Printed plat books and the free online map for owners around Island City.
Main page: Union County, OR GIS & Parcel Viewer (official map link, Union County facts and neighboring maps).
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Looking for a Union County plat book? Plenty of people around Summerville still want a paper atlas with owner names on every section. We'll cover what's in one, where Union County copies turn up, and how the county's free map fills the gaps.
What's inside a county plat book
Private publishers compile plat books from county records, so a county edition is a snapshot of who owned land near La Grande the year it was printed. It's different from a recorded plat, which is the official survey drawing for a subdivision in La Grande filed with the county.
Opening the Union County parcel viewer
There's no separate Union County parcel site to hunt for; the ORMAP statewide tax lot viewer carries the county's parcels along with the rest of Oregon. Zoom to Union County, click a tax lot near North Powder, and copy the map and tax lot number for the assessment search. Bookmark our Union County page too; it tracks the official Oregon link if it moves and lists the maps around North Powder.
Union County at a glance
La Grande is the county seat, and Cove, Elgin, Imbler, and Island City are among the other towns on the county map. Unincorporated communities in the county, including Alicel, Camp Elkanah, and Hilgard, display up as small groups of parcels along the roads. Union County had an estimated 25,944 people in 2023 (Census Bureau), spread across about 2,037 square miles. Outside North Powder, most of the county map is farm, ranch or timber ground with large, irregular tracts.
Where Union County land records are kept
For land near Elgin, the deed itself lives in the county recording office, and the map is an index to it. Copy the parcel identifier and legal description from the county record well before you request a deed for land near North Powder.
Where Union County plat books turn up
Try the library in La Grande or a local historical society for older Union County editions; libraries sometimes keep past atlases for reference. An old atlas can help trace when a tract close to Cove split off from a larger farm.
What a plat book page lists near Elgin
Many atlases add rural residence listings and road maps, handy on back roads near Hilgard. Owner names in an older Union County edition may be decades out of date, so confirm on the county map before contacting anyone near Hilgard. For a land purchase near La Grande, rely on the county parcel record and a title search, not an atlas.
Old atlases and family history in Union County
Farm families near Imbler frequently keep successive editions of the Union County plat book, which together display how ownership shifted over decades. Some buyers print the county parcel map at township scale to carry on back roads near Summerville.
Work and land use in Union County
Union County's 2022 business count was 736 establishments, with construction, retail trade, and other services the largest groups. Forestry and logging and agriculture and forestry support services make up an above-average share of Union County businesses, a clue to how land around Summerville gets used.
The free online alternative
For current ownership, the free ORMAP statewide tax lot viewer beats any printed book: owners update as deeds are processed, and you can click any tract close to La Grande. Print a screenshot of the tracts around La Grande if you want a paper copy in the truck.
Union County plat book questions
Can I use a plat book to locate lot lines near Summerville?
It lists rough ownership blocks; for lines near Summerville, use recorded plats and surveys.
Where can I locate old plat books for Union County, Oregon?
Check the library in Summerville, local historical groups and estate sales for older Union County editions.
Is there a current plat book for Union County, Oregon?
It depends on whether a publisher has a county edition in print; local offices in Summerville most frequently know.
Is a plat book the same as a recorded plat for a lot in Summerville?
No; a lot in Summerville answers to its recorded plat, and the county atlas is only a guide.
Should I use the Union County, Oregon parcel map instead of a plat book?
For current owners near Imbler, yes; the ORMAP statewide tax lot viewer updates as deeds are processed.
Open the official Union County, OR parcel map Union 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.