List of O.. South Dakota settlements in ABC order. Found 8 settlements. More popular settlements are written with larger fonts.
Oacoma town, SD (Lyman County)
Oelrichs town, SD (Fall River County)
Oldham city, SD (Kingsbury County)
Olivet town, SD (Hutchinson County)
Onaka town, SD (Faulk County)
Onida city, SD (Sully County)
Orient town, SD (Faulk County)
Ortley town, SD (Roberts County)
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