Hermosa, SD is a city located in Custer County, South Dakota and has a land area of 478.58 square miles (1,239.52 km2). The water area for the city is 0.72 square miles or 1.86 km2. There is one unique zip code in Hermosa, South Dakota and it is 57744. The area code(s) for Hermosa is 605.
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