This small incorporated town is located in Grant County, southwest of La Grande, between Mt Vernon and Mitchell along US Hwy 26. Also situated along the banks of the John Day River.
Dayville is yet another Oregon place name derived from John Day, a member of the Astor expedition.
The John Day Fossil Beds National Monument is located nine miles west of Dayville. The region boasts four designated Wild and Scenic rivers, a National Park, and beautiful high desert scenery popular with photographers, bird watchers and hikers. The Northside, Murderers Creek and Ochoco hunting units intersect at Dayville, and the area is popular throughout the state for deer and elk hunting, as well as upland game birds.
There is also a Dayville, Connecticut.
Population for Dayville is 145.