Total population (1990 census): 20539
County seat: Jerseyville
CropSELECT
FruitsCrop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 294 | 53720 | 6581689 bu | |
| Sorghum for Grain or Seed | 3 | 65 | 4545 bu | |
| Wheat | 166 | 9908 | 573650 bu | |
| Rye | 3 | 31 | 870 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 189 | 4722 | 12447 tons, dry | |
| Alfalfa Hay | 153 | 2886 | 9335 tons, dry | |
| Small Grain Hay | 17 | 329 | 673 tons, dry | |
| Tame Hay | 55 | 1051 | 1525 tons, dry | |
| Wild Hay | 8 | 58 | 91 tons dry | |
| Grass Silage | 9 | 398 | 2467 tons, grn | |
| Corn for Silage | 35 | 1130 | 20811 tons, grn | |
| Sorghum Cut for Dry Forage | 3 | 35 | 89 tons, grn | |
| Sorghum for Silage | 3 | 48 | 530 tons, grn | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 283 | 51702 | 1915836 bu | |
| Fruits | Farms | Acres | Yield | |
| Apples | 11 | 163 | 16372 trees | |
| Peaches | 6 | (D) | (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 | 5 | (D) | 76 | (D) |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.