Eureka is a city in western McPherson County, South Dakota, United States, near the North Dakota state line. The population was 813 at the 2020 census. Eureka was laid out in 1887, and named "Eureka", a Greek exclamation meaning "I have found it!" 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). According to the United States Census Bureau, the city has a total area of 1.00 square mile (2.59 km2), of which 0.93 square miles (2.41 km2) is land and 0.07 square miles (0.18 km2) is water. More information...
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