Castlewood, SD

ZIP code 57223 serves Castlewood and surrounding farmland in Hamlin County, northeastern South Dakota. Its compact town center is surrounded by agricultural land and rural roads. Notable local landmarks include the historic Castlewood Opera House, Castlewood City Park, and Castlewood School, which serve as cultural, recreational, and civic focal points. The area’s small-town streetscape reflects its role as a local service center for nearby farming communities.