| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Aberdeen | city | South Dakota | United States | 45.46 | -98.49 | 1669 | |
| Academy | city | South Dakota | United States | 43.46 | -99.08 | 1699 | |
| Agar | city | South Dakota | United States | 44.84 | -100.07 | 1830 | |
| Ahnberg | city | South Dakota | United States | 44.30 | -97.06 | 1765 | |
| Ajax | city | South Dakota | United States | 43.90 | -103.18 | 3435 | |
| Akaska | city | South Dakota | United States | 45.33 | -100.12 | 1801 | |
| Albee | city | South Dakota | United States | 45.05 | -96.55 | 1171 | |
| Alcester | city | South Dakota | United States | 43.02 | -96.63 | 1669 | |
| Alexandria | city | South Dakota | United States | 43.65 | -97.78 | 1669 | |
| Allen | city | South Dakota | United States | 43.28 | -101.92 | 3349 | |
| Allison Crossing | city | South Dakota | United States | 45.20 | -101.92 | 2509 | |
| Alpena | city | South Dakota | United States | 44.18 | -98.37 | 1669 | |
| Alsen | city | South Dakota | United States | 42.96 | -96.81 | 1669 | |
| Alsville | city | South Dakota | United States | 44.59 | -97.13 | 1669 | |
| Altamont | city | South Dakota | United States | 44.84 | -96.69 | 1850 | |
| Alto | city | South Dakota | United States | 44.33 | -100.13 | 1669 | |
| Ames | city | South Dakota | United States | 44.27 | -99.08 | 1814 | |
| Amherst | city | South Dakota | United States | 45.74 | -97.92 | 1669 | |
| Anderson Subdivision | city | South Dakota | United States | 43.52 | -96.63 | 1669 | |
| Andover | city | South Dakota | United States | 45.41 | -97.90 | 1669 | |
| Andys Acres | city | South Dakota | United States | 43.63 | -96.69 | 1669 | |
| Antelope | city | South Dakota | United States | 43.30 | -100.63 | 2578 | |
| Antelope Development Area | city | South Dakota | United States | 43.30 | -100.63 | 2578 | |
| Appleby | city | South Dakota | United States | 44.82 | -97.05 | 1719 | |
| Ardmore | city | South Dakota | United States | 43.02 | -103.66 | 3585 | |
| Argonne | city | South Dakota | United States | 44.07 | -97.64 | 1669 | |
| Argyle | city | South Dakota | United States | 43.53 | -103.65 | 5029 | |
| Arlington | city | South Dakota | United States | 44.36 | -97.13 | 1814 | |
| Arlington Beach | city | South Dakota | United States | 44.53 | -97.10 | 1706 | |
| Armour | city | South Dakota | United States | 43.32 | -98.35 | 1669 | |
| Arpan | city | South Dakota | United States | 44.79 | -103.65 | 2900 | |
| Arrowhead Estates | city | South Dakota | United States | 44.04 | -103.28 | 3572 | |
| Artas | city | South Dakota | United States | 45.89 | -99.81 | 1824 | |
| Artesian | city | South Dakota | United States | 44.01 | -97.92 | 1669 | |
| Ashland Heights | city | South Dakota | United States | 44.13 | -103.13 | 3349 | |
| Ashton | city | South Dakota | United States | 44.99 | -98.50 | 1669 | |
| Astoria | city | South Dakota | United States | 44.56 | -96.55 | 1804 | |
| Athboy | city | South Dakota | United States | 45.57 | -101.92 | 2509 | |
| Athol | city | South Dakota | United States | 45.01 | -98.60 | 1669 | |
| Aurora | city | South Dakota | United States | 44.28 | -96.69 | 1669 | |
| Aurora Center | city | South Dakota | United States | 43.53 | -98.59 | 1669 | |
| Avance (historical) | city | South Dakota | United States | 44.92 | -102.25 | 2526 | |
| Avon | city | South Dakota | United States | 43.00 | -98.06 | 1669 |