Eureka is a city in McPherson County, South Dakota, United States. It is near the North Dakota state line. The population was 813 at the 2020 census.[1]
Eureka was laid out in 1887, and named "Eureka", a Greek word meaning "I have found it!"[2] Eureka is located at 45°46′9″N 99°37′19″W / 45.76917°N 99.62194°W / 45.76917; -99.62194 (45.769069, -99.621953).[3]
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