Total population (1990 census): 10045
County seat: Jefferson
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 612 | 147897 | 20074105 bu | |
| Oats | 47 | 652 | 48736 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 614 | 146025 | 6527512 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 201 | 5243 | 14222 tons, dry | |
| Alfalfa Hay | 166 | 3916 | 12104 tons, dry | |
| Small Grain Hay | 22 | 253 | 344 tons, dry | |
| Tame Hay | 39 | 760 | 1443 tons, dry | |
| Wild Hay | 6 | 220 | 201 tons dry | |
| Grass Silage | 6 | 94 | 386 tons, grn | |
| Corn for Silage | 31 | 1096 | 18117 tons, grn | |
*Alfalfa, grass silage, green chops etc.