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

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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