Total population (1990 census): 51040
County seat: Clinton
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 918 | 171357 | 23414391 bu | |
| Wheat for Grain, Total | 8 | 90 | 4373 bu | |
| Oats | 210 | 3554 | 241640 bu | |
| Rye | 3 | 20 | 482 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 745 | 99452 | 4969010 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 494 | 16826 | 52120 tons, dry | |
| Alfalfa Hay | 452 | 12769 | 43608 tons, dry | |
| Small Grain Hay | 73 | 1077 | 2132 tons, dry | |
| Tame Hay | 51 | 992 | 2026 tons, dry | |
| Wild Hay | 11 | 68 | 138 tons dry | |
| Grass Silage | 41 | 1920 | 12645 tons, grn | |
| Corn for Silage | 125 | 3961 | 64758 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Snap Bean | 4 | D | ||
| Sweet Corn | 9 | 11 | ||
| Tomatoes | 5 | 2 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 15 | 41 | 1657 trees | |
| Cherries, Total | 4 | Z | 11 trees | |
| Grapes | 3 | 1 | 150 vines | |
| Peaches | 5 | 1 | 36 trees | |
| Pears | 4 | D | 24 trees | |
| Plums and Prunes | 3 | 1 | 9 trees | |
| 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 | 8 | D | 60 | 96 |
| Cut Christmas Trees Harvested | 3 | X | 22 | 4 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.
Z=Less than half of the unit shown.