INCOME OF FAMILIES AND PERSOAG IN THE UNITED STATES: 1957. (~dvance data on family income in 1957 were issued in June 1958 in Current Population Reports, Se-. ries P-60, No. 29. Preliminary data on the 1957 income of persons appear in Series P-60, No. 28, issued in May 1958) Average (median) family income in the. United States was estimated at $5,000 in 1957, or about 4 percent higher than in 1956, ac-. cording to estimates released today by the. Bureau of the Census, Department of Commerce. pwever, this $200 gain inmoney income between. 1956 and 1957 probably represented no signifi-.