Total population (1990 census): 19950
County seat: Maquoketa
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 787 | 91247 | 11575597 bu | |
| Wheat for Grain, Total | 12 | 387 | 14020 bu | |
| Barley | 6 | 205 | 9500 bu | |
| Oats | 370 | 8205 | 531135 bu | |
| Rye | 6 | 66 | 1739 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 271 | 18686 | 905042 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 779 | 49004 | 160275 tons, dry | |
| Alfalfa Hay | 719 | 38466 | 136877 tons, dry | |
| Small Grain Hay | 111 | 2014 | 4144 tons, dry | |
| Tame Hay | 71 | 3036 | 6178 tons, dry | |
| Wild Hay | 7 | 76 | 168 tons dry | |
| Grass Silage | 107 | 5412 | 38712 tons, grn | |
| Corn for Silage | 181 | 4910 | 74131 tons, grn | |
| Sorghum for Silage | 3 | 29 | 258 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Sweet Corn | 8 | 32 | ||
| Tomatoes | 3 | 1 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 5 | D | 1459 trees | |
| Strawberries | 5 | 15 | 45800 lbs | |
| 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 | 7 | 23500 | 11 | 37 |
| Florculture Crops | 3 | D | D | D |
| Bedding/Garden Plants | 3 | D | D | D |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.