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