Total population (1990 census): 6507
County seat: Flandreau
CropSELECT
Cereals, Pseudocereals, Oilseeds
Industrial, Fiber
Forages
Vegetables
Small Fruits
Tree Fruits and Nuts
Herb, Aromatic, Medicinal, and Bioactive
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 377 | 85477 | 9039434 bu | |
| Wheat for Grain, Total | 45 | 3355 | 143765 bu | |
| Other Spring Wheat | 37 | 1766 | 58716 bu | |
| Winter Wheat | 9 | 1589 | 85049 bu | |
| Barley | 4 | 239 | 10051 bu | |
| Oats | 52 | 1377 | 79805 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybeans for Beans | 396 | 94987 | 3443594 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 290 | 15236 | 41350 tons, dry | |
| Alfalfa Hay | 218 | 10112 | 31944 tons, dry | |
| Small Grain Hay | 10 | 270 | 498 tons, dry | |
| Tame Hay | 53 | 1197 | 2422 tons, dry | |
| Wild Hay | 123 | 3033 | 5118 tons dry | |
| Grass Silage | 19 | 624 | 4108 tons, grn | |
| Corn for Silage | 118 | 5081 | 71138 tons, grn | |
| Sorghum for Silage | 4 | 41 | 350 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Pumpkins | 3 | 10 | ||
| Sweet Corn | 3 | 4 | ||
*Alfalfa, grass silage, green chops etc.