Arizona's diverse population is always changing. Understanding the state's shifting demographics matters for good planning and effective policy making. This issue of Indicator Insight explores some of the major categories of demographic data available from the decennial census, the American Community Survey and other key sources.

The decennial census count for Arizona of 6,392,017 on April 1, 2010 is considerably less than the latest population estimates, which are for July 1, 2009. In this edition of Indicator Insight, author Tom Rex examines the possible reasons for the large census count discrepancy and its implications for Arizona.