Total population (1990 census): 106470
County seat: Rochester
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 723 | 97352 | 13600896 bu | |
| Wheat for Grain, Total | 9 | 139 | 4990 bu | |
| Spring Wheat for Grain | 7 | D | D | |
| Barley | 25 | 478 | 25475 bu | |
| Oats | 237 | 5610 | 332590 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 545 | 58684 | 2499171 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 702 | 30007 | 90537 tons, dry | |
| Alfalfa Hay | 607 | 21337 | 71854 tons, dry | |
| Small Grain Hay | 73 | 1172 | 2615 tons, dry | |
| Tame Hay | 68 | 1285 | 2300 tons, dry | |
| Wild Hay | 30 | 301 | 408 tons dry | |
| Grass Silage | 114 | 5912 | 40086 tons, grn | |
| Corn for Silage | 263 | 7506 | 133192 tons, grn | |
| Sorghum for Silage | 5 | 81 | 504 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Green Lima Beans | 12 | 578 | ||
| Green Peas | 79 | 4264 | ||
| Pumpkins | 9 | 119 | ||
| Sweet Corn | 89 | 7300 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 12 | 47 | 5830 trees | |
| Grapes | 5 | 5 | D | |
| Raspberries | 5 | 3 | 8838 lbs | |
| Strawberries | 3 | 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 | 18 | D | 248 | 807 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 3 | X | 21 | X |
| Florculture Crops | 4 | D | D | D |
| Bedding/Garden Plants | 4 | D | D | D |
| Cut Christmas Trees Harvested | 9 | X | 111 | 53 |
| Nursery Crops | 4 | D | 46 | 190 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.