Total population (1990 census): 12483
County seat: Winterset
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 520 | 68946 | 8287469 bu | |
| Wheat for Grain, Total | 6 | 204 | 5498 bu | |
| Oats | 63 | 1225 | 68586 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 533 | 67246 | 2764953 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 583 | 26757 | 64629 tons, dry | |
| Alfalfa Hay | 508 | 19768 | 52534 tons, dry | |
| Small Grain Hay | 96 | 1986 | 3431 tons, dry | |
| Tame Hay | 138 | 3851 | 6344 tons, dry | |
| Wild Hay | 14 | 339 | 559 tons dry | |
| Grass Silage | 21 | 813 | 5292 tons, grn | |
| Corn for Silage | 60 | 2022 | 23178 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Okra | 3 | Z | ||
| Sweet Corn | 9 | 14 | ||
| Tomatoes | 6 | 4 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 6 | 8 | 239 trees | |
| Peaches | 3 | D | 25 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 | 12 | D | 390 | 865 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 4 | X | 41 | X |
| Florculture Crops | 4 | D | 17 | 182 |
| Bedding/Garden Plants | 3 | D | D | D |
| Cut Christmas Trees Harvested | 4 | X | 12 | 267 |
| Nursery Crops | 4 | D | D | D |
*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.