Uninsured Rates for 2010 Assistant Secretary for Planning and Evaluation (ASPE) 18 percent lowest in history. disproportionately lacked health insurance 49.9 million Americans, or about 1 in 6, were uninsured 50 million who were uninsured pre-Obamacare 18 percent 49.9 million Americans, or about 1 in 6, were uninsured 16.3 percent in 2010