Total population (1990 census): 15731
County seat: Mantorville
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 424 | 96447 | 14079226 bu | |
| Wheat for Grain, Total | 16 | 528 | 23217 bu | |
| Spring Wheat for Grain | 13 | 394 | 16777 bu | |
| Winter Wheat for Grain | 4 | 134 | 6440 bu | |
| Barley | 10 | 174 | 11695 bu | |
| Oats | 93 | 1975 | 133652 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 406 | 87698 | 3720840 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 307 | 12723 | 35156 tons, dry | |
| Alfalfa Hay | 265 | 8013 | 24317 tons, dry | |
| Small Grain Hay | 30 | 538 | 1008 tons, dry | |
| Tame Hay | 43 | 761 | 1569 tons, dry | |
| Wild Hay | 20 | 197 | 251 tons dry | |
| Grass Silage | 41 | 3214 | 24028 tons, grn | |
| Corn for Silage | 106 | 4174 | 82457 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Snap Bean | 15 | 2337 | ||
| Cucumbers & Pickles | 3 | D | ||
| Green Peas | 42 | 2904 | ||
| Pumpkins | 5 | D | ||
| Squash | 3 | 6 | ||
| Sweet Corn | 39 | 7175 | ||
| Tomatoes | 3 | 1 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 5 | 13 | 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 | 8 | D | 12 | 206 |
| Florculture Crops | 4 | D | D | D |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.