Total population (1990 census): 139510
County seat: Janesville
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 758 | 142138 | 19241169 bu | |
| Wheat for Grain, Total | 141 | 5814 | 345868 bu | |
| Spring Wheat | 9 | 104 | 3834 bu | |
| Winter Wheat | 134 | 5710 | 342034 bu | |
| Barley | 5 | 99 | 3825 bu | |
| Oats | 179 | 3008 | 189202 bu | |
| Rye | 6 | 91 | 2912 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 572 | 86326 | 3739951 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 675 | 35111 | 94949 tons, dry | |
| Alfalfa Hay | 618 | 23186 | 70891 tons, dry | |
| Small Grain Hay | 65 | 1464 | 2567 tons, dry | |
| Tame Hay | 55 | 1054 | 1730 tons, dry | |
| Wild Hay | 8 | 126 | 321 tons dry | |
| Grass Silage | 138 | 9281 | 58332 tons, grn | |
| Corn for Silage | 252 | 8181 | 129485 tons, grn | |
| Sorghum for Silage | 3 | 14 | 52 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Asparagus | 5 | 12 | ||
| Green Lima Beans | 12 | 1446 | ||
| Snap Bean | 11 | 305 | ||
| Beets | 3 | D | ||
| Head Cabbage | 4 | 1 | ||
| Cantaloupes | 9 | 7 | ||
| Cucumbers & Pickles | 9 | 3 | ||
| Green Onions | 3 | 1 | ||
| Green Peas | 33 | 3141 | ||
| Hot Peppers | 3 | D | ||
| Sweet Peppers | 7 | 2 | ||
| Potatoes | 5 | 16 | 3412 bu | |
| Pumpkins | 18 | 51 | ||
| Squash | 14 | 13 | ||
| Sweet Corn | 46 | 3197 | ||
| Tomatoes | 17 | 9 | ||
| Watermelons | 7 | 12 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 18 | 154 | 13482 trees | |
| Cherries, Total | 3 | D | D | |
| Grapes | 3 | 3 | D | |
| Raspberries | 12 | 17 | 22710 lbs | |
| Strawberries | 9 | 38 | 206862 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 | 38 | 132176 | 732 | 2178 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 7 | X | D | X |
| Florculture Crops | 16 | D | 13 | 563 |
| Bedding/Garden Plants | 12 | 78676 | D | 432 |
| Cut Flowers and Cut Florist Greens | 5 | D | 11 | D |
| Cut Christmas Trees Harvested | 10 | X | 25 | 65 |
| Nursery Crops | 11 | D | D | D |
| Other Nursery and Greenhouse Crops | 6 | D | 112 | 36 |
| Herb, Spice, Medicinal, Bioactive... | Farms | Acres | Yield | |
| Tobacco | 74 | 290 | 625873 lbs | |
| Mint for Oil | 3 | D | D | |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.