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is a town in Sheridan County, Wyoming, United States. The population was 678 at the 2000 census.
Dayton is located at (44.874952, -107.264851) at the confluence of the Tongue River and The Little Tongue River. It is on US Highway 14, just east of the Big Horn Mountains.
According to the United States Census Bureau, the town has a total area of 0.5 square miles (1.2 km²), all of it land.