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- Sac Township, Sac County
- St. Ansgar Township, Mitchell County
- Saint Charles Township, Floyd County
- St. Clair Township, Benton County
- St. Clair Township, Monona County
- St. Johns Township, Harrison County
- St. Marys Township, Mills County
- Salem Township, Henry County
- Salt Creek Township, Davis County
- Salt Creek Township, Tama County
- Sand Creek Township, Union County
- Saratoga Township, Howard County
- Saylor Township, Polk County
- Scotch Grove Township, Jones County
- Scott Township, Buena Vista County
- Scott Township, Fayette County
- Scott Township, Floyd County
- Scott Township, Franklin County
- Scott Township, Fremont County
- Scott Township, Hamilton County
- Scott Township, Henry County
- Scott Township, Johnson County
- Scott Township, Madison County
- Scott Township, Mahaska County
- Scott Township, Montgomery County
- Scott Township, Poweshiek County
- Scranton Township, Greene County
- Seely Township, Guthrie County
- Seneca Township, Kossuth County
- Settlers Township, Sioux County
- Seventy-Six Township, Muscatine County
- Seventy-Six Township, Washington County
- Sharon Township, Appanoose County
- Sharon Township, Audubon County
- Sharon Township, Clinton County
- Sharon Township, Johnson County
- Shelby Township, Shelby County
- Shell Rock Township, Butler County
- Sheridan Township, Carroll County
- Sheridan Township, Cherokee County
- Sheridan Township, Poweshiek County
- Sheridan Township, Scott County
- Sheridan Township, Sioux County
- Sherman Township, Calhoun County
- Sherman Township, Hardin County
- Sherman Township, Jasper County
- Sherman Township, Kossuth County
- Sherman Township, Monona County
- Sherman Township, Montgomery County
- Sherman Township, Pocahontas County
- Sherman Township, Sioux County
- Sherman Township, Story County
- Shiloh Township, Grundy County
- Sidney Township, Fremont County
- Sigourney Township, Keokuk County
- Silver Township, Cherokee County
- Silver Creek Township, Ida County
- Silver Creek Township, Mills County
- Silver Creek Township, Pottawattamie County
- Silver Lake Township, Dickinson County
- Silver Lake Township, Palo Alto County
- Silver Lake Township, Worth County
- Sioux Township, Clay County
- Sioux Township, Lyon County
- Sioux Township, Monona County
- Sioux Township, Plymouth County
- Sioux Township, Sioux County
- Sloan Township, Woodbury County
- Smithfield Township, Fayette County
- Soap Creek Township, Davis County
- Soldier Township, Crawford County
- Soldier Township, Monona County
- South Township, Madison County
- South Fork Township, Delaware County
- South Fork Township, Jackson County
- South Fork Township, Wayne County
- Spaulding Township, Union County
- Sperry Township, Clayton County
- Spirit Lake Township, Dickinson County
- Spring Township, Cherokee County
- Spring Creek Township, Black Hawk County
- Spring Creek Township, Mahaska County
- Spring Creek Township, Tama County
- Spring Grove Township, Linn County
- Spring Rock Township, Clinton County
- Spring Valley Township, Dallas County
- Spring Valley Township, Monona County
- Springdale Township, Cedar County
- Springfield Township, Cedar County
- Springfield Township, Kossuth County
- Springfield Township, Winneshiek County
- Squaw Township, Warren County
- Stacyville Township, Mitchell County
- Stanton Township, Plymouth County
- Stapleton Township, Chickasaw County
- State Center Township, Marshall County
- Steady Run Township, Keokuk County
- Stockholm Township, Crawford County
- Stuart Township, Guthrie County
- Sugar Creek Township, Cedar County
- Sugar Creek Township, Poweshiek County
- Sugar Grove Township, Dallas County
- Summerset Township, Adair County
- Summit Township, Adair County
- Summit Township, Clay County
- Summit Township, Marion County
- Summit Township, O'Brien County
- Sumner Township, Buchanan County
- Sumner Township, Iowa County
- Sumner Township, Webster County
- Sumner Township, Winneshiek County
- Sumner No. 2 Township, Bremer County
- Superior Township, Dickinson County
- Swan Lake Township, Emmet County
- Swan Lake Township, Pocahontas County
- Swea Township, Kossuth County
- Sweetland Township, Muscatine County
Read more about this topic: List Of Iowa Townships