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Mount Vernon is a city in Grant County, Oregon, United States. Its post office was established in 1877 and named after a black stallion that belonged to settler David W. Jenkins. The stallion's stable, a small stone building, is still standing in a field on the north side of U.S. Highway 26 about 2.2 miles (3.5 km) east of the main intersection in town. In 1915 the ranching community had a population of 60 and a hotel at a hot springs resort approximately 2 miles (3.2 km) north. The population had grown to 451 by the 1950 census. There are a few motels and restaurants in Mount Vernon. As of the 2020 census, Mount Vernon had a population of 548.