Using the 2013-2015 American Community Survey, this brief finds improvements for both parents and children in uninsurance, Medicaid/CHIP participation, and the number who are eligible for Medicaid/CHIP but not enrolled. Uninsurance fell nationally and in nearly every state, and the number of eligible but uninsured children fell to 2.1 million – declining by over half since 2008. Children’s participation reached 93.1 percent in 2015 (exceeding 90 percent in 36 states), while participation among parents rose to 80.2 percent, with larger gains between 2013 and 2015 in expansion states than nonexpansion states. Participation grew among every subgroup of children and parents examined.