The document compares data on health insurance coverage estimates from the Current Population Survey (CPS), American Community Survey (ACS), and Small Area Health Insurance Estimates (SAHIE). It discusses the methods, geographies, variables, years of data available, and similarities and differences between the three data sources. Key highlights include that CPS provides estimates from 1987 to present for the nation and states, ACS provides more granular sub-state estimates but from 2008 to present, and SAHIE combines ACS with administrative records to provide county-level estimates for 2008 to 2011.