Total population (1990 census): 20847
County seat: Decorah
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 964 | 116778 | 15888053 bu | |
| Wheat for Grain, Total | 5 | 541 | D | |
| Barley | 59 | 846 | 46248 bu | |
| Oats | 436 | 9128 | 569231 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 556 | 46832 | 2097700 bu | |
| Dry Edible Beans | 3 | D | D | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 884 | 50154 | 159400 tons, dry | |
| Alfalfa Hay | 827 | 36859 | 131860 tons, dry | |
| Small Grain Hay | 148 | 3253 | 7502 tons, dry | |
| Tame Hay | 63 | 1511 | 3381 tons, dry | |
| Wild Hay | 18 | 211 | 253 tons dry | |
| Grass Silage | 185 | 8320 | 49204 tons, grn | |
| Corn for Silage | 419 | 11245 | 189559 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Sweet Corn | 4 | 12 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 4 | 8 | 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 | 14 | D | 254 | 588 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 3 | X | 4 | X |
| Florculture Crops | 3 | D | 1 | D |
| Cut Christmas Trees Harvested | 7 | X | 31 | 111 |
| Nursery Crops | 5 | D | D | D |
| Other Nursery and Greenhouse Crops | 5 | D | 55 | 5 |
| Herb, Spice, Medicinal, Bioactive... | Farms | Acres | Yield | |
| Maple Trees Tapped | 3 | 240 | 3892 | |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.