The 1840 United States Census only listed the name of the head of household. The head of household was also listed under that persons age group. The following list is of the age groups. There are two sets of numbers. The numbers go from left to right and a slash / will separate the categories.

FREE WHITE MALES 
under 5 years old 
5 - 10 years old 
10 - 15 years old 
15 - 20 years old 
20 - 30 years old 
30 - 40 years old 
40 - 50 years old 
50 - 60 years old 
60 - 70 years old 
70 - 80 years old 
80 - 90 years old 
90 - 100 years old 
over 100 years old 

FREE WHITE FEMALES 
under 5 years old 
5 - 10 years old 
10 - 15 years old 
15 - 20 years old 
20 - 30 years old 
30 - 40 years old 
40 - 50 years old 
50 - 60 years old 
60 - 70 years old 
70 - 80 years old 
80 - 90 years old 
90 - 100 years old 
over 100 years old 

SLAVES 

FREE COLORED 

Foreigners Not Naturalized