Eureka, SD is a city located in Mcpherson County, South Dakota and has a land area of 532.86 square miles (1,380.10 km2). The water area for the city is 5.66 square miles or 14.66 km2. There is one unique zip code in Eureka, South Dakota and it is 57437. The area code(s) for Eureka is 605.
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