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Key to the 1820 census:
Free white males: Each digit of the 6 digit number represents an age group.  
First digit = under 10
Second digit = 10 and under 16
Third digit = 16 and under 18
Fourth digit = 18 and under 26
Fifth digit = 26 and under 45
Sixth digit = 45 and up
 
Free white females: Each digit of the 5 digit number represents an age group.  
First digit = under10
Second digit = 10 and under 16
Third digit = 16 and under 26
Fourth digit = 26 and under 45
Fifth digit = 45 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