Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Son Run | Stream | | Putnam | 39 25 10 N | 087 00 02 W |
| Songer Airport | Airport | 199 | Fountain | 40 04 45 N | 087 15 40 W |
| Sorgen Ditch | Canal | 233 | Allen | 41 00 22 N | 084 50 06 W |
| Sorrowful Mother Shrine | Church | 293 | Franklin | 39 19 50 N | 085 11 26 W |
| Souder Lake | Lake | 254 | Whitley | 41 09 23 N | 085 35 31 W |
| Souders Branch | Stream | | Clark | 38 28 13 N | 085 57 28 W |
| Souders Lake | Reservoir | 182 | Dearborn | 39 17 02 N | 084 49 22 W |
| Souls Harbor Church | Church | 230 | Allen | 41 04 06 N | 085 10 37 W |
| Sours Run | Stream | | Franklin | 39 22 24 N | 084 48 45 W |
| Sousley Lake | Lake | 223 | LaPorte | 41 35 30 N | 086 25 10 W |
| South Arm Beck Ditch | Canal | 192 | LaPorte | 41 43 40 N | 086 50 10 W |
| South Arm Ditch | Canal | 228 | Marshall | 41 17 31 N | 086 25 55 W |
| South Bend | Populated Place | 211 | St. Joseph | 41 41 00 N | 086 15 00 W |
| South Bend College | School | 216 | St. Joseph | 41 40 29 N | 086 14 55 W |
| South Bend Country Club | Locale | 228 | St. Joseph | 41 40 56 N | 086 21 53 W |
| South Bend Motor Speedway | Locale | 224 | St. Joseph | 41 40 06 N | 086 21 52 W |
| South Bend Plaza | Locale | 229 | St. Joseph | 41 37 41 N | 086 18 50 W |
| South Boston | Populated Place | 234 | Washington | 38 34 58 N | 085 58 45 W |
| South Branch Big Ox Creek | Stream | | Washington | 38 35 27 N | 085 51 33 W |
| South Branch Clifty Creek | Stream | | Decatur | 39 25 12 N | 085 27 35 W |
| South Branch Elkhart River | Stream | | Noble | 41 27 38 N | 085 31 49 W |
| South Branch Garrison Creek | Stream | | Fayette | 39 32 05 N | 085 11 25 W |
| South Branch Hursey Ditch | Canal | 252 | DeKalb | 41 18 31 N | 084 58 39 W |
| South Branch Mud Creek | Stream | | Fulton | 40 57 31 N | 086 12 17 W |
| South Branch North Creek | Stream | | Marion | 39 41 08 N | 086 19 32 W |
| South Branch Pine Creek | Stream | | Marshall | 41 25 52 N | 086 24 28 W |
| South Branch Pleasant Run | Stream | | Marion | 39 48 16 N | 086 02 20 W |
| South Branch Salt Creek | Stream | | Brown | 39 07 49 N | 086 07 06 W |
| South Branch Sugar Creek | Stream | | Tipton | 40 15 10 N | 086 15 19 W |
| South Branch Turkey Creek | Stream | | Rush | 39 40 09 N | 085 22 08 W |
| South Calhoun School | School | 247 | Allen | 41 02 06 N | 085 08 09 W |
| South Cemetery | Cemetery | 143 | Sullivan | 39 01 41 N | 087 26 34 W |
| South Center | Populated Place | 215 | LaPorte | 41 28 35 N | 086 38 24 W |
| South Central Area Vocational School | School | 206 | Orange | 38 27 42 N | 086 16 40 W |
| South Central Elementary School | School | 230 | LaPorte | 41 29 51 N | 086 46 35 W |
| South Central Junior and High School | School | 238 | Harrison | 38 04 55 N | 086 00 06 W |
| South Central Junior-Senior High School | School | 230 | LaPorte | 41 29 51 N | 086 46 35 W |
| South Chain Lake | Lake | 219 | St. Joseph | 41 41 08 N | 086 22 11 W |
| South Clear Lake | Lake | 230 | St. Joseph | 41 45 30 N | 086 22 35 W |
| South Creek | Stream | | Marion | 39 46 38 N | 086 03 18 W |
| South Creek | Stream | | Rush | 39 33 50 N | 085 34 31 W |
| South Dearborn High School | School | 153 | Dearborn | 39 03 53 N | 084 54 00 W |
| South Edgewood | Populated Place | 268 | Madison | 40 05 50 N | 085 43 58 W |
| South Elementary School | School | 280 | Hendricks | 39 45 27 N | 086 31 25 W |
| South Elwood | Populated Place | 264 | Madison | 40 15 45 N | 085 50 32 W |
| South Emerson Avenue Church of God | Church | 244 | Marion | 39 42 36 N | 086 04 55 W |
| South Fairview Run | Stream | | Washington | 38 36 39 N | 085 47 39 W |
| South Fork Beaver Creek | Stream | | Orange | 38 41 05 N | 086 42 53 W |
| South Fork Blue River | Stream | | Washington | 38 26 00 N | 086 11 06 W |
| South Fork Buck Creek | Stream | | Harrison | 38 07 15 N | 086 04 44 W |
| South Fork Crawford Creek | Stream | | Lawrence | 38 49 19 N | 086 22 48 W |
| South Fork Creek | Stream | | Jackson | 39 04 19 N | 086 00 35 W |
| South Fork Deer Creek | Stream | | Miami | 40 36 18 N | 086 13 45 W |
| South Fork Eel River | Stream | | Boone | 39 56 12 N | 086 35 15 W |
| South Fork Laughery Creek | Stream | | Switzerland | 38 58 31 N | 085 00 11 W |
| South Fork Leatherwood Creek | Stream | | Lawrence | 38 51 57 N | 086 27 03 W |
| South Fork Lewis Creek | Stream | | Shelby | 39 25 20 N | 085 46 51 W |
| South Fork Little Raccoon Creek | Stream | | Putnam | 39 50 09 N | 087 06 38 W |
| South Fork Little Salt Creek | Stream | | Rush | 39 26 40 N | 085 13 50 W |
| South Fork Lost River | Stream | | Washington | 38 37 09 N | 086 19 35 W |
| South Fork Patoka River | Stream | | Warrick | 38 22 55 N | 087 20 30 W |
| South Fork Pine Creek | Stream | | Elkhart | 41 38 02 N | 085 47 12 W |
| South Fork Prairie | Flat | 285 | Boone | 39 57 43 N | 086 31 34 W |
| South Fork Prairie Creek | Stream | | Daviess | 38 43 23 N | 087 08 39 W |
| South Fork Salt Creek | Stream | | Jackson | 39 04 13 N | 086 17 45 W |
| South Fork Smalls Creek | Stream | | Knox | 38 45 21 N | 087 26 51 W |
| South Fork White Creek | Stream | | Bartholomew | 39 04 19 N | 086 00 35 W |
| South Fork Wildcat Creek | Stream | | Tippecanoe | 40 26 15 N | 086 48 06 W |
| South Gate | Populated Place | 312 | Franklin | 39 19 16 N | 084 57 24 W |
| South Gate Cemetery | Cemetery | 302 | Franklin | 39 19 18 N | 084 58 13 W |
| South Gate Hill | Summit | 297 | Franklin | 39 20 15 N | 084 57 30 W |
| South Gleason Park Golf Course | Locale | 181 | Lake | 41 33 29 N | 087 20 45 W |
| South Granger Post Office (historical) | Post Office | 168 | Monroe | 39 04 05 N | 086 24 10 W |
| South Grove Elementary School | School | 245 | Marion | 39 42 31 N | 086 05 27 W |
| South Harrison Lake | Reservoir | 214 | Bartholomew | 39 10 56 N | 086 01 14 W |
| South Haven | Populated Place | 199 | Porter | 41 32 31 N | 087 08 14 W |
| South Haven | Populated Place | 228 | Wabash | 40 47 01 N | 085 49 45 W |
| South Haven Branch Porter County Public Library | Building | 200 | Porter | 41 32 27 N | 087 08 25 W |
| South Haven Christian Church | Church | 196 | Porter | 41 32 50 N | 087 08 10 W |
| South Haven Christian School | School | 196 | Porter | 41 32 52 N | 087 08 10 W |
| South Haven Church of the Nazarene | Church | 207 | Porter | 41 31 29 N | 087 09 06 W |
| South Haven Elementary School | School | 199 | Porter | 41 32 38 N | 087 08 31 W |
| South Hemlock Lake | Reservoir | 208 | Fountain | 39 59 00 N | 087 09 48 W |
| South Hogan Creek | Stream | | Ripley | 39 04 40 N | 085 09 11 W |
| South Hollow | Valley | | Floyd | 38 16 20 N | 085 51 09 W |
| South Knox Elementary School | School | 157 | Knox | 38 36 40 N | 087 20 58 W |
| South Knox Junior and Senior High School | School | 163 | Knox | 38 38 09 N | 087 25 17 W |
| South Lake | Lake | 160 | Sullivan | 38 57 55 N | 087 15 35 W |
| South Lake | Lake | 139 | Vigo | 39 26 26 N | 087 27 39 W |
| South Lake Church of God | Church | 190 | Lake | 41 30 28 N | 087 18 04 W |
| South Lake Church of the Nazarene | Church | 212 | Lake | 41 28 09 N | 087 14 47 W |
| South Lake County Community Services | Building | 221 | Lake | 41 22 10 N | 087 25 07 W |
| South Lake Dillman | Reservoir | 231 | Morgan | 39 30 45 N | 086 15 12 W |
| South Lake Dillman Dam | Dam | 231 | Morgan | 39 30 45 N | 086 15 12 W |
| South Lake Mental Health Center | Hospital | 213 | Lake | 41 27 48 N | 087 21 45 W |
| South LaPorte | Populated Place | 245 | LaPorte | 41 34 30 N | 086 44 23 W |
| South Lawn Cemetery | Cemetery | 320 | Wayne | 39 48 30 N | 085 12 24 W |
| South Liberty Church | Church | 223 | Orange | 38 28 19 N | 086 35 06 W |
| South Liberty Church | Church | 238 | Washington | 38 26 43 N | 086 05 32 W |
| South Liberty Church | Church | 262 | Wells | 40 40 07 N | 085 19 00 W |
| South Little Lake | Lake | 265 | Kosciusko | 41 04 33 N | 085 54 20 W |
| South Marion | Populated Place | 203 | Jasper | 40 54 45 N | 087 07 35 W |
| South Martin | Populated Place | 199 | Martin | 38 32 40 N | 086 52 27 W |
| South Martin Church | Church | 196 | Martin | 38 31 50 N | 086 52 23 W |
| South Milford | Populated Place | 298 | LaGrange | 41 31 57 N | 085 16 20 W |
| South Milford Cemetery | Cemetery | 299 | Noble | 41 31 36 N | 085 16 35 W |
| South Milford Independent Baptist Church | Church | 302 | LaGrange | 41 32 03 N | 085 16 15 W |
| South Mound Cemetery | Cemetery | 317 | Henry | 39 55 13 N | 085 22 45 W |
| South Mud Lake | Lake | 242 | Fulton | 40 57 04 N | 086 11 25 W |
| South Newton Junior and Senior High School | School | 204 | Newton | 40 46 20 N | 087 26 31 W |