Total population (1990 census): 98276
County seat: Sioux City
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 808 | 186237 | 21430318 bu | |
| Wheat for Grain, Total | 6 | 342 | 11210 bu | |
| Oats | 77 | 1616 | 113371 bu | |
| Popcorn | 9 | 695 | 2352545 lbs, shelled | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 753 | 162550 | 6467355 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 458 | 14289 | 32559 tons, dry | |
| Alfalfa Hay | 323 | 7716 | 22743 tons, dry | |
| Small Grain Hay | 89 | 1487 | 2880 tons, dry | |
| Tame Hay | 144 | 3860 | 5603 tons, dry | |
| Wild Hay | 13 | 582 | 480 tons dry | |
| Grass Silage | 14 | 644 | 2557 tons, grn | |
| Corn for Silage | 117 | 4170 | 66556 tons, grn | |
| Sorghum for Silage | 7 | 86 | 1135 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Snap Bean | 8 | 2 | ||
| Head Cabbage | 3 | 1 | ||
| Potatoes | 3 | D | 50 bu | |
| Pumpkins | 3 | 1 | ||
| Squash | 3 | 1 | ||
| Sweet Corn | 8 | 21 | ||
| Tomatoes | 8 | 2 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 7 | D | 6257 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 | 20 | 90800 | 29 | 1009 |
| Florculture Crops | 12 | D | D | 788 |
| Bedding/Garden Plants | 12 | 63512 | D | D |
| Cut Christmas Trees Harvested | 8 | X | 9 | 23 |
| Nursery Crops | 3 | D | D | 110 |
| Other Nursery and Greenhouse Crops | 6 | D | 9 | 88 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.