| GeoNames Home | Postal Codes | Download / Webservice | About |
| Name | Population | Latitude/Longitude | |
|---|---|---|---|
| 1 | Sioux Falls | 140,336 | 43.55 / -96.7 |
| 2 | Rapid City | 61,888 | 44.081 / -103.231 |
| 3 | Aberdeen | 23,667 | 45.465 / -98.486 |
| 4 | Watertown | 20,185 | 44.899 / -97.115 |
| 5 | Brookings | 18,216 | 44.311 / -96.798 |
| 6 | Mitchell | 14,741 | 43.709 / -98.03 |
| 7 | Pierre | 13,879 | 44.368 / -100.351 |
| 8 | Yankton | 13,410 | 42.871 / -97.397 |
| 9 | Huron | 11,026 | 44.363 / -98.214 |
| 10 | Vermillion | 10,009 | 42.779 / -96.929 |
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