Survey taken by the United State Census Bureau to poll population, social and economic patterns in years between the decennial censes.  Counties or enumeration units over 65,000 are surveyed every year.  Most information collected by the census is also collected in the American Community Survey.  Because of the logistics involved in collecting information of this magnitude, a sample of the population is taken.  For the state of North Carolina, the sample size is approximately 55,422.  Please refer to for the techniques and quality assurance controls used in this process.

Source: Donec Tristique Duiegeturna