THE UNION COUNTY LAND BRIEF
Land in the
Mesic Forest Zone setting.
Union County has 2,036.9 square miles of land in Oregon. 7 mapped landscape regions meet across Union County: Mesic Forest Zone, Maritime-Influenced Zone, Blue Mountain Basins, among others.
The Blue Mountains combine open mountain ranges and dissected volcanic uplands. The Wallowa and Elkhorn high country includes older granitic and metamorphic rocks above the surrounding lava landscape.
Regional context: Blue Mountains ↗ · Regional mapping across the county footprint
Where the landscape changes
Union County intersects 7 mapped regional units. The largest mapped shares are:
- Mesic Forest Zone32.6%
- Maritime-Influenced Zone25.8%
- Blue Mountain Basins20.1%
- Wallowas/Seven Devils Mountains7.8%
- Continental Zone Foothills6.3%
Finding your parcel within Union County
The atlas lists 8 cities, towns, townships, and Census communities associated with Union County, including La Grande, Union, Elgin. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Union County by land and water
The Census records 1.91 square miles of water within Union County, or 0.1% of its total area. That share is close to Union County’s 0.1%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Union County has 2,070.1 times the land area of nearby Island City city (0.98 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Baker County, Grant County, Umatilla County, Wallowa County within Oregon. A tract near one of these lines should be matched to the county identifier on its own records.

