Dayville is a city along U.S. Route 26 in Grant County, in the U.S. state of Oregon. It was incorporated in 1913. The population was 149 at the 2010 census. Dayville was named for the John Day River. The original site of the Dayville post office was 3 miles west of the city's current location. In the mid-19th century, Dayville was along the route of a wagon road, renamed The Dalles Military Road in about 1870, that connected The Dalles on the Columbia River with gold mines near Canyon City. Dayville was incorporated in 1913.
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