Places beginning with SO in South Dakota, United States
- Soft Water (historical), Township of
- Soldier Creek
- Sorum
- Sorum Addition
- Sorum Heights
- South Campbell, Unorganized Territory of
- South Canyon Country Estates
- South Creek, Township of
- South Dakota
- South Dakota Park
- South Detroit, Township of
- South Dewey, Unorganized Territory of
- Southeast Bon Homme, Unorganized Territory of
- Southeast Buffalo, Unorganized Territory of
- Southeast Gregory, Unorganized Territory of
- Southeast Jackson, Unorganized Territory of
- Southeast Yankton, Unorganized Territory of
- South Forest City, Township of
- South Harding, Unorganized Territory of
- South Lawrence, Unorganized Territory of
- South Lyman, Unorganized Territory of
- South Perkins, Unorganized Territory of
- South Riverside, Township of
- South Shore
- South Shore, Town of
- South Stanley, Unorganized Territory of
- Southwest Bon Homme, Unorganized Territory of
- Southwest Fall River, Unorganized Territory of
- Southwest Faulk, Unorganized Territory of
- Southwest (historical), Township of
- Southwest Jackson, Unorganized Territory of
- Southwest Meade, Unorganized Territory of
- Southwest Perkins, Unorganized Territory of
- South Ziebach, Unorganized Territory of