Total population (1990 census): 21522
County seat: Oskaloosa
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 681 | 117711 | 15931605 bu | |
| Wheat for Grain, Total | 4 | 131 | 5660 bu | |
| Oats | 130 | 2362 | 172213 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 643 | 94723 | 4584281 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 432 | 15911 | 50351 tons, dry | |
| Alfalfa Hay | 381 | 11879 | 41537 tons, dry | |
| Small Grain Hay | 74 | 1255 | 2796 tons, dry | |
| Tame Hay | 56 | 1103 | 2084 tons, dry | |
| Wild Hay | 6 | 58 | 98 tons dry | |
| Grass Silage | 48 | 1616 | 11497 tons, grn | |
| Corn for Silage | 99 | 2648 | 48193 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Snap Bean | 3 | D | ||
| Cantaloupes | 3 | 1 | ||
| Sweet Corn | 6 | 56 | ||
| Tomatoes | 3 | 4 | ||
| 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 | 96376 | D | 656 |
| Florculture Crops | 3 | 96376 | D | D |
| Bedding/Garden Plants | 3 | D | D | 409 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.