Average GPS coordinates for Eureka Postcode location: 45.771, -99.331. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Eureka on map:

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Listing cities & postcodes (1):
>> South Dakota, 57437 Eureka, McPherson, GPS coordinates: 45.7707,-99.3308