Clarified Auditing Standards require quantification of materiality levels, which are estimates to guide auditors' decision-making and design of auditing procedures. This estimate is only a guide and is not a specific determination of what is, and is not, material in an audit.
1 The current population of the United States of America is 324,385,585 as of Friday, August 12, 2016, based on the latest United Nations estimates.  the United States population is equivalent to 4.38% of the total world population.
The first decennial census in the United States showed a population of just under four million people. Today, the U.S. population is estimated at more than 310 million. Here you will find a list of the U.S. population every ten years from the first official census in 1790 to the most recent in 2000. 1790 - 3,929,214. 1800 - 5,308,483.