Specialized corn-soybean farms—those with at least 50 percent of their production value from corn and soybeans and with at least $40,000 in gross revenue—fared better financially In 1987 than farms specializing in most other types of commodities. Specialized corn-soybean farms accounted for 56 percent of all corn sales and 59 percent of all soybean sales in the United States. Small specialized farms with gross revenue between $40,000 and $100,000 had the least favorable costs and returns structure. Production was concentrated in five adjoining areas: the western Corn Belt, the eastern Corn Belt, the Northern Plains, the Lake States, and the South. Specialized corn-soybean farms in the Northern Plains showed the highest net returns and lowest costs.