Total population (1990 census): 30001
County seat: Knoxville
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 526 | 77621 | 9769902 bu | |
| Wheat for Grain, Total | 7 | 199 | 7850 bu | |
| Oats | 105 | 2184 | 146320 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 521 | 71549 | 3205697 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 495 | 22706 | 58528 tons, dry | |
| Alfalfa Hay | 433 | 15942 | 46079 tons, dry | |
| Small Grain Hay | 45 | 843 | 1484 tons, dry | |
| Tame Hay | 106 | 4687 | 8893 tons, dry | |
| Wild Hay | 9 | 110 | 206 tons dry | |
| Grass Silage | 20 | 1124 | 5596 tons, grn | |
| Corn for Silage | 39 | 1079 | 18344 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Snap Bean | 3 | 2 | ||
| Sweet Corn | 7 | 22 | ||
| Tomatoes | 3 | 1 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 4 | D | D | |
| Nursery and Greenhouse Crops, Cut Christmas Trees Harvested, Mushrooms, and Sod Grown for Sale | Farms | Sq. ft. under glass or other protection | Acres in the open | Sales ($1,000) |
| Nursery and Greenhouse Crops | 6 | D | 102 | D |
| Florculture Crops | 3 | D | D | D |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.