This study creates a pre-reform baseline trend for an evaluation of the Affordable Care Acts (ACA) impact on health insurance coverage in the United States. Using the 2000 to 2010 Current Population Survey (CPS), this brief analyzes coverage trends among children, parents, and childless adults, overall and by ACA-relevant income groups. We find that over the past decade, rates of employer-sponsored insurance (ESI) have steadily deteriorated across these population groups, with more substantial declines occurring among the lower-income categories; all three population groups saw increases in Medicaid/CHIP coverage, with children experiencing the largest increase; and the percent of parents and childless adults without health insurance steadily increased whereas the percent of children without health insurance has slightly decreased.