What is the source of Esri Demographic data in the U.S.?

Esri develops annual updates to various demographic, socioeconomic, behavioral, and lifestyle datasets for the U.S.
Led by chief demographer Kyle R. Cassal, Esri's data development team has more than 40 years of experience in market intelligence. The team's economists, statisticians, demographers, geographers, and analysts produce independent small-area demographic and socioeconomic estimates and forecasts for the United States. The team develops exclusive demographic models and methodologies to create market-proven datasets, many of which are now industry benchmarks, such as Tapestry™ Segmentation, Consumer Spending, Market Potential, and annual Updated Demographics. Esri Demographics power ArcGIS through dynamic web maps, data enrichment, reports, and infographics.