Pre-1980

National

Summary files
 Historical National Population Estimates, 1900 to 1999 (8k)
Population by age, sex, and race
 National Estimates by Age, Sex, Race: 1900-1979 (PE-11)

State

Historical Annual Time Series of State Population Estimates
 1970 to 1980, by Selected Age Groups (123k)

Historical Annual Time Series of State Population Estimates and Demographic Components of Change

 1900 to 1990 Total Population Estimates
Population by age, sex, and race
 1970-1979 Intercensal State Estimates by Age, Sex, Race (PE-19)
Excel (1.3M) | PDF (328k) | CSV (479k)

County

Summary file
 1970 to 1979 Population Estimates of the U.S., States, and Counties
Documentation and Dataset (473k) | Compressed File (103k compressed)

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Population by age, sex, and race
 1970-1979 Intercensal County Estimates by Age, Sex, Race