Timber Lake, SD is a city located in Dewey County, South Dakota and has a land area of 389.44 square miles (1,008.65 km2). The water area for the city is 1.92 square miles or 4.97 km2. There is one unique zip code in Timber Lake, South Dakota and it is 57656. The area code(s) for Timber Lake is 605.
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