Dayton Mercantile Posted August 2, 2019 by segreto Now serving tasty toasted sandwiches and delicious ice cream treats. The Dayton Mercantile was built in 1882 as Henry Bakers General Store. The character of the history still remains. Stop in. Shop where the legends shopped in the beautiful town of Dayton on Hwy 14 on the way to Yellowstone.