The 1810 United States Census was the third census in the United States since 1790 . As a result of the census, a population of 7,239,881 inhabitants was determined for the USA on August 6, 1810, of which 1,191,362 were slaves . Louisiana was a new addition to the census .
The data contain information on the name of the head of the family, number of free white persons (men and women; according to age groups as in 1800), number of free persons, number of slaves, city or district and place of residence or residential district.
The state population figures from the 10-year United States censuses are key to determining the number of representatives from those states in the United States House of Representatives . The adjustment is usually made in the next but one Congress after a census.
Most populous cities
Most populous cities in the United States by population in 1810.