Mr. Donuts, founded in 2026 and based in Watertown, SD, is your local destination for delicious, freshly made donuts in Castlewood, Florence, Henry, Kranzburg, and beyond. We offer a wide variety, including birthday donuts, frosted donuts, filled donuts, blueberry donuts, maple donuts, strawberry donuts, donut holes, twists, apple fritters, bear claws, cinnamon rolls, maple bacon donuts, long johns, old fashioned donuts, and sprinkle donuts. Enjoy our breakfast sandwiches and pair your treat with our refreshing iced coffees. Mr. Donuts—bringing sweetness to your day!