In the US they happen every ten years as is required by the Constitution. They are instrumental in helping to determine the numbers of representatives that each state will have in Congress.
The US Census is every 10 years.
The census in the United States is conducted every 10 years.
In the United States, a census is instituted every 10 years.
they conduct a census every 10 years
The number of Representatives is set by law, presently at 435. The apportionment of the Representatives among the states is determined by a census which takes place every ten years, as required by Article I, Section II of the U. S. Constitution. The next census will take place in April 2010.
The census is once every 10 years.
The census count occurs once every 10 years... cn tget u a more exact date soz
Every ten years
10 years
The US Census is taken every ten years in the years ending in zero.
Every ten years with the official United States census.
The All India Wild Animal Census is done every four years. The census was last carried out in May 2014.