Census Data API: /data/1990/pep/int

Census API: Examples for /data/1990/pep/int_charagegroups
Geography Hierarchy	Geography Level	Example URL
2 examples
state› county	N/A	https://api.census.gov/data/1990/pep/int_charagegroups?get=POP,YEAR,AGEGRP,RACE_SEX,HISP&for=county:*&in=state:02&key=YOUR_KEY_GOES_HERE
state› county	N/A	https://api.census.gov/data/1990/pep/int_charagegroups?get=POP,YEAR,AGEGRP,RACE_SEX,HISP&for=county:201&in=state:02&key=YOUR_KEY_GOES_HERE