2015/2020 Esri US Demographic Updates Methodology Statement
This white paper details Esri's methodology for demographic updates and projections, changes in geographies, plus other important trends.
Esri revises its forecasts annually to draw on the latest data. However, this data can be enhanced with personal knowledge of an area to provide the qualitative, anecdotal detail that is not captured in a national database. It is incumbent on the data user and the producers to incorporate as much information as possible when assessing local trends, especially for areas that are subject to "boom-bust" cycles or natural disasters.