Total population (1990 census): 12029
County seat: Grundy Center
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 602 | 150400 | 20669062 bu | |
| Wheat for Grain, Total | 4 | 144 | 6907 bu | |
| Oats | 55 | 1032 | 81105 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 604 | 133983 | 6594050 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 209 | 4261 | 12535 tons, dry | |
| Alfalfa Hay | 181 | 3127 | 9987 tons, dry | |
| Small Grain Hay | 16 | 193 | 396 tons, dry | |
| Tame Hay | 28 | 392 | 1042 tons, dry | |
| Wild Hay | 8 | 171 | 183 tons dry | |
| Grass Silage | 10 | 378 | 2779 tons, grn | |
| Corn for Silage | 34 | 831 | 14364 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Sweet Corn | 9 | 263 | ||
| 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 | 4 | D | D | D |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.