Places beginning with SO in Arkansas, United States
- Social Hill
- Soda Valley
- Solgohachia
- Solo
- Sommer (historical)
- Sonora
- Sorrells
- Soudan
- Southall, Township of
- South Bend
- South Bend (historical)
- South Big Rock, Township of
- Southbridge Addition (subdivision)
- South Crossett
- Southern Home (historical)
- South Fork (historical), Township of
- South Fork, Township of
- South Fork, Township of
- South Fort Smith
- South Harrison, Township of
- Southland
- Southland
- South Lead Hill
- South Lebanon, Township of
- South Ozark
- South Plains
- Southridge Estates (subdivision)
- South Saint Francis, Township of
- South Shore Park
- Southside
- Southside
- Southside Addition (subdivision)
- South Stuttgart
- South Union, Township of
- South View (historical), Township of
- Southwood Addition
- South Yocum, Township of