Federal census takers were asked to record information about all those who were in each household on the census day, which was 1 June 1850<ref>http://www.census.gov/history/pdf/1850instructions.pdf</ref>. A census taker might have visited a house on a later date, but the information he collected was supposed to be about the people who were in the house on the census day. The basic census enumeration unit was the county. Each county was divided into enumeration districts, one for each enumerator. The completed forms were sent to the Census Office in the Commerce Department in Washington D.C. | Federal census takers were asked to record information about all those who were in each household on the census day, which was 1 June 1850<ref>http://www.census.gov/history/pdf/1850instructions.pdf</ref>. A census taker might have visited a house on a later date, but the information he collected was supposed to be about the people who were in the house on the census day. The basic census enumeration unit was the county. Each county was divided into enumeration districts, one for each enumerator. The completed forms were sent to the Census Office in the Commerce Department in Washington D.C. |