Places beginning with SO in Pennsylvania, United States
- Social Island
- Society Hill (subdivision)
- Soho
- Soldier
- Solebury
- Solebury, Township of
- Solomon Gap
- Somerfield
- Somerset
- Somerset, Borough of
- Somerset County
- Somerset, Township of
- Somerset, Township of
- Somers Lane
- Somerton
- Somerville
- Somerville
- Sonestown
- Sonman
- Sopertown
- Soradoville
- Sorrelhorse
- Soudersburg
- Souderton
- Souderton, Borough of
- Soukesburg
- Sours Mills
- South Abington, Township of
- South Altoona
- Southampton
- Southampton, Township of
- Southampton, Township of
- Southampton, Township of
- Southampton, Township of
- South Annville, Township of
- South Auburn
- South Beaver, Township of
- South Bend
- South Bend, Township of
- South Bethlehem
- South Bethlehem
- South Bethlehem, Borough of
- South Bradford
- South Branch
- South Buffalo, Township of
- South Canaan
- South Canaan, Township of
- South Centre, Township of
- South Chester (subdivision)
- South Coatesville
- South Coatesville, Borough of
- South Connellsville
- South Connellsville, Borough of
- South Coventry, Township of
- South Creek, Township of
- Southdale
- South Danville
- South Devonshire Estates
- South Easton (subdivision)
- South Eaton
- South Ebervale
- South Fayette, Township of
- South Fork
- South Fork, Borough of
- South Franklin, Township of
- South Gibson
- South Greensburg
- South Greensburg, Borough of
- South Hanover, Township of
- South Heberton
- South Heidelberg, Township of
- South Heights
- South Heights, Borough of
- South Hermitage
- South Hill
- South Hills
- South Huntingdon, Township of
- South Lakemont
- South Lebanon
- South Lebanon, Township of
- South Londonderry, Township of
- South Mahoning, Township of
- South Manheim, Township of
- South Media
- South Middleton, Township of
- Southmont
- Southmont, Borough of
- South Montrose
- South Mountain
- South New Castle
- South New Castle, Borough of
- South Newton, Township of
- South Park, Township of
- South Philipsburg
- South Philipsburg, Borough of
- South Pottstown
- South Pymatuning, Township of
- South Renovo
- South Renovo, Borough of
- South Ridge Estates
- South Shenango, Township of
- Southside
- South Side Flats (subdivision)
- Southside Slopes (subdivision)
- South Sterling
- South Strabane
- South Strabane, Township of
- South Tamaqua
- South Temple
- South Terrace (subdivision)
- South Towanda
- South Union
- South Uniontown
- South Union, Township of
- South Versailles, Township of
- Southview
- South View Acres
- South Warren
- South Warren
- South Waverly
- South Waverly, Borough of
- Southwest
- Southwest Center City (subdivision)
- Southwest Greensburg
- Southwest Greensburg, Borough of
- Southwest Madison, Township of
- Southwest Schuylkill (subdivision)
- Southwest, Township of
- South Whitehall, Township of
- South Williamsport
- South Williamsport, Borough of
- South Woodbury, Township of
- Southwood Hills
- South Wood Hills
- Sowash