Key to the 1820 census:
Free white males: Each digit of the 6 digit number represents an age group.  
First digit = under 10 years of age
Second digit = of 10 and under 16 years of age
Third digit = 16 to 18 years of age
Fourth digit = of 16 and under 26 years of age
Fifth digit = of 26 and under 45 years of age
Sixth digit = of 45 years of age and up
 
Free white females: Each digit of the 5 digit number represents an age group.  
First digit = under 10 years of age
Second digit = of 10 and under 16 years of age
Third digit = of 16 and under 26 years of age
Fourth digit = of 26 and under 45 years of age
Fifth digit = of 45 years of age and up
 
How many in this occupation:
Agr = agriculture.  Com = Commerce.   Man = manufacturing.
 
Free Colored Males: Each digit of the 4 digit number represents an age group.
under 14 * under 26 * under 45 * 45 and up
 
Free Colored Females: Each digit of the 4 digit number represents an age group.
under 14 * under 26 * under 45 * 45 and up
 
Slave schedules: Each digit of the 4 digit number represents an age group.
Males: under 14 * under 26 * under 45 * 45 and up
Females: under 14 * under 26 * under 45 * 45 and up

Back to the 1820 Hart County, Kentucky Census