Every 10 years. The next one will be in 2010.
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A formal count of a population is a census.
every 10 years
How often must legislative redistricting be done in Illinois?
Each state has two senators, but the number of congressmen are determined by population based on census figures. For instance, Mississippi had five congressional districts from 1960 to 2000. But one district was abolished when the 2000 census showed that the state had lost population.
A census is an official count of members of a population of people (or of other living things). The government form of a census counts the residents or citizens in specified areas, often at regular intervals.The US Census is an official count of the population done at 10-year intervals, with estimations or corrections made in the intervening years. The latest US Census is for the year 2010.The purpose of the census is to gather information about the country and the people in it.