- Saegertown (Population: 1,071)
- Salix-Beauty Line Park (Population: 1,259)
- Salunga-Landisville (Population: 4,771)
- Sanatoga (Population: 7,734)
- Sand Hill (Population: 2,345)
- Sandy (Population: 1,687)
- Saxonburg (Population: 1,629)
- Sayre (Population: 5,813)
- Schlusser (Population: 4,750)
- Schnecksville (Population: 1,989)
- Schuylkill Haven (Population: 5,548)
- Schwenksville (Population: 1,693)
- Scott Township (Population: 17,288)
- Scottdale (Population: 4,772)
- Scranton (Population: 76,415)
- Selinsgrove (Population: 5,383)
- Sellersville (Population: 4,564)
- Seven Fields (Population: 1,986)
- Sewickley (Population: 3,902)
- Shaler Township (Population: 29,757)
- Shamokin Dam (Population: 1,502)
- Shamokin (Population: 8,009)
- Shanor-Northvue (Population: 4,825)
- Sharon Hill (Population: 5,468)
- Sharon (Population: 16,328)
- Sharpsburg (Population: 3,594)
- Sharpsville (Population: 4,500)
- Sheffield (Population: 1,268)
- Shenandoah Heights (Population: 1,298)
- Shenandoah (Population: 5,624)
- Shillington (Population: 5,059)
- Shiloh (Population: 10,192)
- Shinglehouse (Population: 1,250)
- Shippensburg (Population: 5,586)
- Shiremanstown (Population: 1,521)
- Shoemakersville (Population: 2,124)
- Shrewsbury (Population: 3,378)
- Silverdale (Population: 1,001)
- Sinking Spring (Population: 2,639)
- Skippack (Population: 2,889)
- Skyline View (Population: 2,307)
- Slatington (Population: 4,434)
- Slippery Rock (Population: 3,068)
- Smethport (Population: 1,684)
- Somerset (Population: 6,762)
- Souderton (Population: 6,730)
- South Connellsville (Population: 2,281)
- South Fork (Population: 1,138)
- South Greensburg (Population: 2,280)
- South Park Township (Population: 14,340)
- South Pottstown (Population: 2,135)
- South Williamsport (Population: 6,412)
- Southmont (Population: 2,262)
- Southwest Greensburg (Population: 2,398)
- Speers (Population: 1,241)
- Spring City (Population: 3,305)
- Spring Grove (Population: 2,050)
- Spring House (Population: 3,290)
- Spring Mount (Population: 2,205)
- Springdale (Population: 3,828)
- Springetts Manor-Yorklyn (Population: 4,156)
- Springfield (Population: 23,677)
- Spry (Population: 4,903)
- St. Clair (Population: 3,254)
- St. Lawrence (Population: 1,812)
- St. Marys (Population: 14,502)
- State College (Population: 38,420)
- Steelton (Population: 5,858)
- Stewartstown (Population: 1,752)
- Stoneboro (Population: 1,104)
- Stonybrook-Wilshire (Population: 5,414)
- Stormstown (Population: 1,602)
- Stowe (Population: 3,585)
- Stowe Township (Population: 6,706)
- Strasburg (Population: 2,800)
- Stroudsburg (Population: 5,756)
- Sturgeon-Noblestown (Population: 1,764)
- Sugar Notch (Population: 1,023)
- Sugarcreek (Population: 5,331)
- Summit Hill (Population: 2,974)
- Sunbury (Population: 10,610)
- Susquehanna Depot (Population: 1,690)
- Susquehanna Trails (Population: 2,134)
- Swarthmore (Population: 6,170)
- Swissvale (Population: 9,653)
- Swoyersville (Population: 5,157)
- Sykesville (Population: 1,246)
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