The Platt Historic District is a designated area located in Platt, South Dakota, recognized for its historical significance and well-preserved architecture. Established in the early 20th century, the district features a variety of buildings that showcase the architectural styles of that era, reflecting the community's development and cultural heritage. The district includes several notable structures, such as the Platt Post Office and the Platt School, which contribute to its historical value. The Platt Historic District serves as a reminder of the town's past and is an important site for both residents and visitors interested in local history.