ZIP Code 57650
About Ralph
Ralph is an unincorporated community in Harding County, South Dakota, United States. Although not tracked by the Census Bureau, Ralph has been assigned the ZIP code of 57650.
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Area Profile
US Census (ACS 5-year · Gazetteer)
14
population
0
people / sq mi
34.0
median age
6
housing units
3
households
75.6
land area (sq mi)