Total population (1990 census): 19444
County seat: Anamosa
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 716 | 135485 | 18643910 bu | |
| Oats | 185 | 4069 | 239383 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 553 | 70527 | 3504748 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 534 | 24448 | 77258 tons, dry | |
| Alfalfa Hay | 484 | 19319 | 67181 tons, dry | |
| Small Grain Hay | 71 | 1503 | 3023 tons, dry | |
| Tame Hay | 53 | 1167 | 1789 tons, dry | |
| Wild Hay | 7 | 198 | 451 tons dry | |
| Grass Silage | 43 | 2261 | 14440 tons, grn | |
| Corn for Silage | 144 | 3595 | 59973 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Sweet Corn | 4 | 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 | 11 | 39130 | D | 330 |
| Florculture Crops | 4 | D | D | 78 |
| Bedding/Garden Plants | 3 | D | D | D |
| Cut Christmas Trees Harvested | 4 | X | 9 | 44 |
| Nursery Crops | 3 | D | 1 | D |
| Other Nursery and Greenhouse Crops | 3 | D | D | 3 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.