Although the total U.S. farm population declined between 1970 and 1975, the population on farms with annual sales greater than $40,000 increased. Such farms account for nearly 80 percent of total farm receipts. Farms with under $2,500 in annual sales contain a third of the U.S. farm population which receives most of its money income from off-farm sources. The nonoperator population declined faster than the farm operator group between 1970 and 1975. The U.S. farm population is concentrated on cash-grain and livestock farms; in 1975, they contained two-thirds of the farm total.