The value of all farms, ranches, hunting land and other land for sale in DeKalb County recently was almost $18 million, representing a total of 1,858 acres of land for sale in DeKalb County. DeKalb County ranks 91st out of 115 counties in the Gateway State for the total number of acres of land currently advertised for sale. Maysville had the most land for sale. From an economic perspective, government and state-level services contribute most to DeKalb County's overall GDP. DeKalb County is the 106th largest county (425 square miles) in Missouri. It's located in the Northwest Missouri region of the state.