Total population (1990 census): 123798
County seat: Waterloo
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 722 | 131973 | 17572621 bu | |
| Oats | 68 | 1229 | 87181 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 709 | 111781 | 5255971 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 298 | 7482 | 22096 tons, dry | |
| Alfalfa Hay | 253 | 4934 | 15729 tons, dry | |
| Small Grain Hay | 37 | 444 | 964 tons, dry | |
| Tame Hay | 51 | 697 | 1215 tons, dry | |
| Wild Hay | 4 | 54 | D | |
| Grass Silage | 8 | 1353 | D | |
| Corn for Silage | 63 | 1727 | 29935 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Asparagus | 6 | 14 | ||
| Snap Bean | 8 | 19 | ||
| Beets | 3 | 1 | ||
| Head Cabbage | 5 | 6 | ||
| Cantaloupes | 7 | 39 | ||
| Eggplant | 5 | 1 | ||
| Lettuce and Romaine | 3 | Z | ||
| Dry Onions | 4 | 2 | ||
| Green Peas | 5 | 1 | ||
| Sweet Peppers | 6 | 4 | ||
| Potatoes | 4 | 1 | 210 bu | |
| Pumpkins | 7 | 40 | ||
| Radishes | 3 | 1 | ||
| Rhubarb | 3 | Z | ||
| Squash | 5 | 1 | ||
| Sweet Corn | 14 | 151 | ||
| Tomatoes | 8 | 4 | ||
| Turnip Greens | 3 | 1 | ||
| Watermelons | 5 | 9 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 6 | 25 | D | |
| Raspberries | 5 | 2 | 1391 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 | 19 | 705728 | 312 | 4092 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 6 | X | D | X |
| Florculture Crops | 8 | 694028 | D | 3064 |
| Bedding/Garden Plants | 8 | 114544 | D | 755 |
| Foliage Plants | 3 | D | D | 196 |
| Potted Flowering Plants | 6 | D | D | 2112 |
| Cut Christmas Trees Harvested | 5 | X | 53 | 91 |
| Nursery Crops | 7 | D | 55 | 616 |
| Greenhouse Vegetables | 3 | 2340 | X | 8 |
*Alfalfa, grass silage, green chops etc.
D=Withheld to avoid disclosing data for individual farms.
X=Not applicable.
Z=Less than half of the unit shown.