Total population (1996 census): 31,969
County seat: Marysville
Crop Statistics (1997 US Census of Agriculture)
| Cereals | Farms | Acres | Yield | |
| Maize=Corn | 333 | 49559 | 6091184 bu | |
| Wheat for Grain, Total | 287 | 18527 | 1038647 bu | |
| Oats | 36 | 489 | 27279 bu | |
| Grain Legumes | Farms | Acres | Yield | |
| Soybean | 487 | 94585 | 3787503 bu | |
| Forages | Farms | Acres | Yield | |
| Total Hay* | 250 | 8095 | 19074 tons, dry | |
| Alfalfa Hay | 181 | 4803 | 13147 tons, dry | |
| Small Grain Hay | 16 | 294 | 509 tons, dry | |
| Tame Hay | 79 | 1617 | 3084 tons, dry | |
| Wild Hay | 9 | 168 | 280 tons dry | |
| Grass Silage | 27 | 1213 | 6161 tons, grn | |
| Corn for Silage | 39 | 1721 | 31548 tons, grn | |
| Vegetables | Farms | Acres | Yield | |
| Cantaloupes | 4 | Z | ||
| Pumpkins | 3 | D | ||
| Sweet Corn | 7 | 22 | ||
| Tomatoes | 4 | 1 | ||
| Fruits | Farms | Acres | Yield | |
| Apples | 10 | 34 | 3976 trees | |
| Grapes | 5 | 4 | 1927 vines | |
| Peaches | 4 | 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 | 40 | 130309 | 433 | 2510 |
| Nursery, Floriculture, Vegetable and Flower Seed Crops | 10 | X | 51 | X |
| Florculture Crops | 15 | D | 11 | 1460 |
| Bedding/Garden Plants | 13 | 110060 | D | 1385 |
| Potted Flowering Plants | 3 | D | D | D |
| Cut Christmas Trees Harvested | 8 | X | 32 | 166 |
| Nursery Crops | 15 | D | 63 | 549 |
| Sod Harvested | 5 | X | 301 | 329 |
| Other Nursery and Greenhouse Crops | 5 | D | 26 | 6 |
*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.