Total population (1990 census): 16310
County seat: Fairfield
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 405 | 61740 | 8058776 bu | |
| Wheat for Grain, Total | 30 | 866 | 39440 bu | |
| Oats | 96 | 1787 | 104230 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 403 | 62066 | 2764056 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 357 | 13924 | 35237 tons, dry | |
| Alfalfa Hay | 278 | 8720 | 25472 tons, dry | |
| Small Grain Hay | 38 | 579 | 1106 tons, dry | |
| Tame Hay | 125 | 3704 | 7252 tons, dry | |
| Wild Hay | 13 | 218 | 269 tons dry | |
| Grass Silage | 23 | 703 | 3413 tons, grn | |
| Corn for Silage | 30 | 602 | 7845 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Asparagus | 3 | 1 | ||
| Squash | 3 | D | ||
| Sweet Corn | 5 | D | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 6 | 6 | 124 trees | |
| Grapes | 3 | 1 | 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 | 9 | D | 9 | 117 |
| Florculture Crops | 3 | D | D | D |
| Cut Christmas Trees Harvested | 4 | X | 4 | 33 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.