Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| South Bear Creek | Stream | | Winneshiek | 43 26 55 N | 091 36 57 W |
| South Bear Creek Access Area | Locale | 278 | Winneshiek | 43 26 17 N | 091 39 06 W |
| South Bear Park | Park | 302 | Winneshiek | 43 26 42 N | 091 41 23 W |
| South Beaver Creek | Stream | | Grundy | 42 34 50 N | 092 47 39 W |
| South Beaver Creek | Stream | | Guthrie | 41 35 54 N | 094 25 55 W |
| South Bethel Cemetery | Cemetery | 241 | Cedar | 41 40 37 N | 091 04 56 W |
| South Bethel Cemetery | Cemetery | 382 | Winnebago | 43 18 24 N | 093 31 19 W |
| South Bethel Church | Church | 239 | Cedar | 41 40 36 N | 091 04 57 W |
| South Branch Little Floyd River | Stream | | O'Brien | 43 09 56 N | 095 45 17 W |
| South Branch Lizard Creek | Stream | | Webster | 42 30 25 N | 094 14 01 W |
| South Branch Salt Creek | Stream | | Tama | 42 03 16 N | 092 23 11 W |
| South Branch Turkey River | Stream | | Howard | 43 19 42 N | 092 13 36 W |
| South Branch West Nodaway River | Stream | | Page | 40 42 17 N | 095 01 06 W |
| South Bristow Cemetery | Cemetery | 297 | Butler | 42 45 10 N | 092 55 01 W |
| South Cedar County Park | Park | 208 | Linn | 41 52 50 N | 091 26 01 W |
| South Cedar Creek | Stream | | Clayton | 42 44 27 N | 091 12 35 W |
| South Cemetery | Cemetery | 205 | Lee | 40 34 07 N | 091 31 22 W |
| South Chequest Creek | Stream | | Davis | 40 47 30 N | 092 11 15 W |
| South Clay Elementary School | School | 398 | Clay | 43 00 57 N | 095 02 15 W |
| South Copper Creek | Stream | | Jackson | 42 03 25 N | 090 24 57 W |
| South Cove Park | Park | 428 | Buena Vista | 42 36 35 N | 095 12 38 W |
| South Creek | Stream | | Appanoose | 40 35 56 N | 092 55 54 W |
| South Creek | Stream | | Kossuth | 43 29 49 N | 094 23 30 W |
| South Creek | Stream | | Ringgold | 40 41 33 N | 094 07 39 W |
| South Des Moines Alternative School | School | 274 | Polk | 41 32 05 N | 093 38 06 W |
| South Elk Creek | Stream | | Decatur | 40 43 34 N | 093 56 33 W |
| South Enes Lutheran Church | Church | 347 | Webster | 42 35 31 N | 094 01 13 W |
| South English | Populated Place | 257 | Keokuk | 41 27 08 N | 092 05 26 W |
| South English (historical) | Locale | 256 | Keokuk | 41 27 10 N | 092 05 25 W |
| South English Cemetery | Cemetery | 253 | Keokuk | 41 28 02 N | 092 05 11 W |
| South English City Hall | Building | 257 | Keokuk | 41 27 08 N | 092 05 26 W |
| South English Post Office | Post Office | 257 | Keokuk | 41 27 08 N | 092 05 26 W |
| South English Public Library | Building | 257 | Keokuk | 41 27 08 N | 092 05 26 W |
| South English River | Stream | | Washington | 41 30 27 N | 092 03 16 W |
| South English Union Church | Church | 257 | Keokuk | 41 27 08 N | 092 05 26 W |
| South Fork Blackhawk Creek | Stream | | Grundy | 42 27 16 N | 092 37 36 W |
| South Fork Catfish Creek | Stream | | Dubuque | 42 28 06 N | 090 41 11 W |
| South Fork Chariton River | Stream | | Appanoose | 40 51 49 N | 093 00 47 W |
| South Fork Clanton Creek | Stream | | Madison | 41 12 54 N | 093 56 36 W |
| South Fork Iowa River | Stream | | Hardin | 42 17 10 N | 093 04 42 W |
| South Fork Long Creek | Stream | | Washington | 41 16 01 N | 091 30 54 W |
| South Fork Lost Creek | Stream | | Scott | 41 40 07 N | 090 25 51 W |
| South Fork Maquoketa River | Stream | | Buchanan | 42 36 30 N | 091 33 41 W |
| South Fork Middle River | Stream | | Guthrie | 41 30 40 N | 094 32 48 W |
| South Fork Park | Park | 298 | Butler | 42 44 40 N | 092 59 16 W |
| South Fork Walker Branch | Stream | | Wayne | 40 49 47 N | 093 07 29 W |
| South Fork Walnut Creek | Stream | | Jones | 42 00 09 N | 091 15 53 W |
| South Fourteenth Street Park | Park | 395 | Emmet | 43 23 53 N | 094 49 33 W |
| South Fox Creek | Stream | | Appanoose | 40 44 36 N | 092 34 56 W |
| South Garry Owen | Populated Place | 300 | Jackson | 42 13 50 N | 090 48 25 W |
| South Grade School | School | 323 | Greene | 42 00 46 N | 094 22 36 W |
| South Grove Cemetery | Cemetery | 348 | Mills | 40 58 39 N | 095 29 36 W |
| South Hall | Building | 279 | Linn | 41 55 25 N | 091 25 24 W |
| South Hamilton Community School | School | 321 | Hamilton | 42 18 07 N | 093 38 46 W |
| South Hamilton Elementary School | School | 323 | Hamilton | 42 18 13 N | 093 38 50 W |
| South Hills Golf Course | Locale | 272 | Black Hawk | 42 26 20 N | 092 19 26 W |
| South Hoosier Creek | Stream | | Linn | 41 52 54 N | 091 36 15 W |
| South Junior High School | School | 334 | Webster | 42 30 03 N | 094 11 04 W |
| South Keokuk Church of Brethren | Church | 207 | Keokuk | 41 13 15 N | 092 03 47 W |
| South Kratz Cemetery | Cemetery | 357 | Winneshiek | 43 17 04 N | 092 03 09 W |
| South Landfill Park | Park | 240 | Linn | 42 01 23 N | 091 36 16 W |
| South Main Street Park | Park | 276 | Bremer | 42 38 46 N | 092 27 47 W |
| South Marion Cemetery | Cemetery | 323 | Hamilton | 42 13 58 N | 093 52 26 W |
| South Marion Church | Church | 332 | Hamilton | 42 13 26 N | 093 53 42 W |
| South Mineral Cemetery | Cemetery | 281 | Jones | 42 07 16 N | 090 58 38 W |
| South Minerva Creek | Stream | | Marshall | 42 07 40 N | 093 08 06 W |
| South Mount Carmel School | School | 299 | Monroe | 40 56 18 N | 092 53 52 W |
| South O'Brien Community School | School | 425 | O'Brien | 42 58 39 N | 095 41 26 W |
| South O'Brien Junior High School | School | 464 | O'Brien | 43 05 19 N | 095 37 41 W |
| South O'Brien Middle School | School | 448 | O'Brien | 42 58 08 N | 095 30 04 W |
| South Oak Grove Cemetery | Cemetery | 362 | Guthrie | 41 30 49 N | 094 18 46 W |
| South Onion Creek | Stream | | Boone | 42 03 21 N | 093 44 19 W |
| South Otter Creek | Stream | | Lucas | 41 08 39 N | 093 31 31 W |
| South Overlook Park | Park | 243 | Marion | 41 21 20 N | 092 59 21 W |
| South Page Senior High School | School | 353 | Page | 40 37 15 N | 095 07 11 W |
| South Park | Park | 314 | Bremer | 42 48 29 N | 092 15 30 W |
| South Park | Park | 266 | Marion | 41 23 55 N | 092 55 03 W |
| South Park | Park | 266 | Polk | 41 37 13 N | 093 42 46 W |
| South Park | Park | 385 | Sac | 42 24 48 N | 094 59 54 W |
| South Park | Park | 211 | Washington | 41 27 45 N | 091 50 06 W |
| South Picayune Creek | Stream | | Harrison | 41 45 10 N | 095 40 13 W |
| South Pine Wildlife Management Area | Park | 286 | Winneshiek | 43 22 40 N | 091 39 46 W |
| South Prairie Area School | School | 253 | Wapello | 41 03 40 N | 092 24 26 W |
| South Prairie Cemetery | Cemetery | 222 | Muscatine | 41 33 15 N | 091 19 52 W |
| South Prairie Grange Hall | Building | 224 | Muscatine | 41 33 14 N | 091 19 45 W |
| South Prairie School (historical) | School | 222 | Washington | 41 17 39 N | 091 42 49 W |
| South Quadrangle Building | Building | 217 | Johnson | 41 39 27 N | 091 32 44 W |
| South Raccoon River | Stream | | Dallas | 41 32 38 N | 093 58 00 W |
| South Raccoon River Access | Locale | 281 | Dallas | 41 34 08 N | 094 11 57 W |
| South Ravine Park | Park | 357 | Woodbury | 42 27 28 N | 096 22 26 W |
| South Ridge Estates | Populated Place | 273 | Polk | 41 30 50 N | 093 36 11 W |
| South River | Stream | | Polk | 41 29 14 N | 093 20 29 W |
| South River Crossing (historical) | Populated Place | 279 | Warren | 41 13 04 N | 093 44 46 W |
| South River Ditch | Canal | 247 | Warren | 41 19 46 N | 093 33 45 W |
| South River Field | Airport | 280 | Warren | 41 12 60 N | 093 46 01 W |
| South River School | School | 253 | Warren | 41 19 17 N | 093 32 17 W |
| South Riverside Park | Park | 275 | Bremer | 42 43 10 N | 092 28 17 W |
| South Rock Creek | Stream | 272 | Tama | 42 04 45 N | 092 48 33 W |
| South Sabula Lakes Park | Park | 180 | Jackson | 42 04 10 N | 090 10 30 W |
| South Saint Petri Cemetery | Cemetery | 320 | Story | 42 08 13 N | 093 37 60 W |
| South Salem Cemetery | Cemetery | 209 | Henry | 40 50 52 N | 091 37 19 W |
| South School | School | 437 | Buena Vista | 42 38 24 N | 095 11 56 W |
| South School | School | 336 | Decatur | 40 44 08 N | 093 44 46 W |
| South School | School | 323 | Hamilton | 42 27 56 N | 093 49 24 W |
| South School (historical) | School | 190 | Clinton | 41 51 53 N | 090 11 09 W |
| South Shell Rock Cemetery | Cemetery | 369 | Worth | 43 26 38 N | 093 14 30 W |
| South Side Elementary School | School | 344 | Franklin | 42 44 15 N | 093 12 04 W |
| South Side Park | Park | 387 | Carroll | 42 03 37 N | 094 52 14 W |
| South Side Shopping Center | Locale | 278 | Bremer | 42 43 09 N | 092 28 31 W |
| South Silver Creek | Stream | | Ida | 42 26 39 N | 095 23 51 W |