There are 191,482 acres of farmland in the county. The principal agricultural products are corn, soy beans, oats and winter wheat.
Livestock is primarily cattle, hogs, and poultry.
Egg production is a very active farm industry. Minerals produced are stone, sand, and gravel. Downtown Decatur has 4 city-owned public parking lots. Four shopping plazas are located throughout Decatur. The activities resulting from the fact that Decatur is the County Seat creates a healthy retail trade.