| Town / County |
Town / County |
Town / County |
| Sabula / Jackson | Sabula Junction / Jackson | Sac & Fox Agency / Wapello |
| SAC CITY / Sac | Sacton / Sac | Safeside / Guthrie |
| Sage / Palo Alto | Sageville / Dubuque | Sailorville / Wapello |
| Saint Ansgar / Mitchell | Saint Anthony / Marshall | Saint Benedict / Kossuth |
| Saint Charles / Madison | Saint Charles City / Floyd | Saint Clair / Monona |
| Saint Donatus / Jackson | Saint George / Monona | Saint Gilman / Osceola |
| Saint Johan / Clayton | Saint Johns / Harrison | Saint Joseph / Kossuth |
| Saint Joseph Junction / Decatur | Saint Joseph's Prairie / Dubuque | Saint Julien / Linn |
| Saint Lucas / Fayette | Saint Mary's / Linn | Saint Mary's / Mills |
| Saint Marys / Warren | Saint Olaf / Clayton | Saint Paul / Lee |
| Saint Paul Junction / Plymouth | Saint Sebald / Clayton | Salem / Henry |
| Salem / Muscatine | Salina / Jefferson | Salix / Woodbury |
| Salt Creek / Davis | Salt Creek / Tama | Salubria / Van Buren |
| Samison / Shelby | Samoa / Jackson | Sampson / Winneshiek |
| Samville / Wayne | Sanborn / O'Brien | Sanbornton / Clinton |
| Sand Creek / Delaware | Sand Prairie / Lee | Sand Ridge / Des Moines |
| Sand Springs / Delaware | Sandersville / Hardin | Sandusky / Lee |
| Sandyville / Warren | Sanspring / Delaware | Santingo / Polk |
| Saratoga / Hamilton | Saratoga / Howard | Sargent / Floyd |
| Sargents Bluff / Woodbury | Sattre / Winneshiek | Saude / Chickasaw |
| Savanna / Jackson | Savannah / Davis | Sawyer / Lee |
| Saxon / Wayne | Saylor / Polk | Saylor Junction / Polk |
| Saylorsville / Polk | Sayre / Buena Vista | Scandia / Dallas |
| Scarville / Winnebago | Schaller / Sac | Schleswig / Crawford |
| Schley / Howard | Schoharie / Sac | Schonberg / Calhoun |
| Schonnberg / Warren | Schrunks / Clayton | Sciola / Montgomery |
| Scotch Grove / Jones | Scotland / Keokuk | Scott / Fayette |
| Scott / Floyd | Scott / Mahaska | Scott Center / Fayette |
| Scotts Mills / Linn | Scottswood / Pottawattamie | Scranton / Greene |
| Scranton City / Greene | Scranton Station / Greene | Searsboro / Poweshiek |
| Seaton / Fayette | Secor / Hardin | Sedalia / Guthrie |
| Sedan / Appanoose | Sedgewick / Decatur | Seigel / Bremer |
| Selection / Monroe | Selma / Van Buren | Selma / Wayne |
| Seneca / Kossuth | Seney / Plymouth | Sepanamo / Johnson |
| Sergeant Bluff / Woodbury | Sevastopal / Polk | Sevastopol / Polk |
| Seventy-eight / Johnson | Seventy-seven / Johnson | Seventy-six Center / Washington |
| Severs / Jasper | Sewal / Wayne | Sexton / Kossuth |
| Seymour / Wayne | Shabbona / O'Brien | Shady Brook / Linn |
| Shady Grove / Buchanan | Shady Oak / Webster | Shaffton / Clinton |
| Shambaugh / Page | Shanghai / Keokuk | Shannon City / Ringgold |
| Shannon City / Union | Sharon / Appanoose | Sharon / Warren |
| Sharon Center / Johnson | Sharps / Taylor | Sharpsburg / Mills |
| Sharpsburg / Taylor | Sharpston / Appanoose | Shawondassa / Dubuque |
| Shawville / Appanoose | Sheffield / Dubuque | Sheffield / Franklin |
| Sheffield / Story | Shelby / Pottawattamie | Shelby / Shelby |
| Shelby's / Clarke | Shelbyville / Shelby | Sheldahl / Boone |
| Sheldahl / Polk | Sheldahl / Story | Sheldon / O'Brien |
| Shell Rock / Butler | Shell Rock / Woodbury | Shell Rock Falls / Cerro Gordo |
| Shellrock / Butler | Shellrock Station / Butler | Shellsburg / Benton |
| Shenandoah / Fremont | Shenandoah / Page | Shepard / Union |
| Sheridan / Poweshiek | Sheridan / Sioux | Sheridan / Van Buren |
| Sheridan Center / Poweshiek | Sherlock / Palo Alto | Sherman / Hardin |
| Sherman / Poweshiek | Sherman Center / Montgomery | Sherrill / Dubuque |
| Sherwood / Calhoun | Shiloh / Cedar | Shinn / Adams |
| Shipley / Story | Shirley / Pocahontas | Shobe's Grove / Franklin |
| Shock's Station / Wapello | Shockley / Henry | Shoo Fly / Johnson |
| Shopton / Lee | Short Line Junction / Polk | Showman / Keokuk |
| Showman Station / Keokuk | Shueyville / Johnson | Siam / Taylor |
| SIBLEY / Osceola | Sickles / Wapello | Side Hill / Cedar |
| Siding "A" / Floyd | SIDNEY / Fremont | Sigel / Clayton |
| SIGOURNEY / Keokuk | Silsbee / Jackson | Silver City / Mills |
| Silver Creek / Delaware | Silver Creek / Ida | Silver Creek / Pottawattamie |
| Silver Lake / Worth | Silver Street / Ringgold | Simpson / Adams |
| Sinclair / Butler | Sioux Center / Sioux | SIOUX CITY / Woodbury |
| Sioux Rapids / Buena Vista | Sisley's Grove / Linn | Six Mile / Clinton |
| Slabtown / Webster | Slagle / Keokuk | Slater / Story |
| Slifer / Webster | Sloan / Woodbury | Smayville / Story |
| Smead / Lyon | Smith Lake / Cass | Smith Siding / Monona |
| Smith's Ferry / Jackson | Smith's Point / Boone | Smithfield / Allamakee |
| Smithfield / Story | Smithland / Woodbury | Smiths / Decatur |
| Smiths / Jackson | Smithsfield / Monroe | Smithstown / Clinton |
| Smithtown / Woodbury | Smyrna / Clarke | Snapp / Pottawattamie |
| Snets / Clayton | Snodgrass Switch / Davis | Snow Hill / Page |
| Sny Magill / Clayton | Snyder / Dallas | Snyder Grove / Woodbury |
| Soap Creek / Davis | Soap Creek Mills / Davis | Soaptown / Iowa |
| Soda Bar / Palo Alto | Solberg / Wright | Soldier / Monona |
| Soldier Valley / Harrison | Solon / Johnson | Somber / Worth |
| Somers / Calhoun | Somida / Shelby | Sonora / Poweshiek |
| South Amana / Iowa | South Amana Station / Iowa | South Augusta / Lee |
| South Bentonsport / Van Buren | South Des Moines / Polk | South English / Keokuk |
| South Flint / Des Moines | South Fork / Wayne | South Franklin / Lee |
| South Garyowen / Jackson | South Independence / Decatur | South Ioka / Keokuk |
| South Junction / Dubuque | South Keosauqua / Van Buren | South Liberty / Johnson |
| South O'Brien / O'Brien | South Ottumwa / Wapello | South River Siding / Warren |
| Southport / Sac | Spaulding / Union | Spechts Ferry / Dubuque |
| SPENCER / Clay | Spencer Grove / Benton | Spencer Junction / Clay |
| Spencerville / Jones | Sperry / Des Moines | Spillville / Winneshiek |
| Spinneyville / Scott | SPIRIT LAKE / Dickinson | Spragueville / Jackson |
| Spring Branch / Delaware | Spring Creek / Mahaska | Spring Creek / Tama |
| Spring Fountain / Bremer | Spring Grove / Des Moines | Spring Grove / Linn |
| Spring Hill / Warren | Spring Lake / Bremer | Spring Rock / Clinton |
| Spring Run / Louisa | Spring Valley / Decatur | Spring Valley / Monona |
| Springbrook / Jackson | Springdale / Cedar | Springfield / Clayton |
| Springfield / Jackson | Springfield / Keokuk | Springfield / Muscatine |
| Springfield / Polk | Springvale / Humboldt | Springville / Clayton |
| Springville / Davis | Springville / Linn | Springwater / Winneshiek |
| Spruce Mills / Jackson | Squeedunk / Keokuk | Squires Mills / Dubuque |
| St. Thomas / Jasper | Stacyville / Mitchell | Stacyville / Monroe |
| Stacyville Junction / Mitchell | Staketown / Palo Alto | Stal / Jackson |
| Stanford / Marshall | Stanhope / Hamilton | Stanley / Buchanan |
| Stanton / Montgomery | Stanwood / Cedar | Stapleton / Chickasaw |
| Star / Marion | Stark / Mahaska | State Center / Marshall |
| State Line / Taylor | Station / Boone | Station / Cerro Gordo |
| Steady Run / Keokuk | Steamboat Rock / Hardin | Steen / Winnebago |
| Stelapolis / Iowa | Stella / Allamakee | Stella / Black Hawk |
| Stennett / Montgomery | Stergis / Howard | Sterling / Jackson |
| Sterling / Louisa | Stiles / Davis | Stilesville / Davis |
| Stillwater / Mitchell | Stillwell / Poweshiek | Stilson / Hancock |
| Stock Yards / Woodbury | Stockport / Van Buren | Stockton / Muscatine |
| Stone City / Jones | Stone Quarry / Madison | Stonega / Hamilton |
| Stoneridge / Mahaska | Stony Hollow / Des Moines | STORM LAKE / Buena Vista |
| Story / Story | Story City / Story | Stout / Grundy |
| Strahan / Mills | Strand / Adams | Stratford / Hamilton |
| Stratford / Webster | Strawberry Hill / Jones | Strawberry Hill / Muscatine |
| Strawberry Point / Clayton | Streepyville / Appanoose | String Prairie / Lee |
| Stringtown / Adams | Stringtown / Benton | Stringtown / Davis |
| Stringtown / Henry | Stringtown / Keokuk | Struble / Plymouth |
| Stuart / Adair | Stuart / Guthrie | Stueben / Davis |
| Stumptown / Van Buren | Sturges Falls / Black Hawk | Sturges Rapids / Black Hawk |
| Sudbury / Muscatine | Suffolk / Clinton | Sugar Creek / Cedar |
| Sugar Creek / Jasper | Sugar Creek / Lee | Sugar Creek Mills / Cedar |
| Sugar Grove / Poweshiek | Sullivan / Jackson | Sully / Jasper |
| Sulphur Springs / Buena Vista | Summer Hill / Jackson | Summers / Benton |
| Summerset / Adair | Summerset / Warren | Summerset Junction / Warren |
| Summit / Clay | Summit / Guthrie | Summit / Muscatine |
| Summit / Story | Summit / Van Buren | Summit / Winneshiek |
| Summitville / Lee | Sumner / Bremer | Sumner / Humboldt |
| Sumner (P.O.) / Bremer | Sunbury / Cedar | Sunnyside / Buchanan |
| Sunnyside / Hardin | Sunnyside / Keokuk | Sunset / Story |
| Superior / Dickinson | Surry / Greene | Sutherland / O'Brien |
| Sutton / Warren | Swaledale / Cerro Gordo | Swan / Marion |
| Swan Lake / Emmet | Swan Lake / Pocahontas | Swanton / Butler |
| Swanwood / Polk | Swea (P.O.) / Kossuth | Swea City / Kossuth |
| Swede Point / Boone | Swedesburg / Henry | Sweetland / Muscatine |
| Swisher / Johnson | Sylvan / Clayton | Sylvia / Linn |
| Syracuse / Bremer |
