Arkansas and Kentucky have seen their rates of uninsured residents drop the most since the Patient Protection and Affordable Care Act's individual mandate went into effect at the beginning of the year, Gallup said Tuesday.
The rate of uninsured in Arkansas dropped from 22.5 percent in 2013 to 12.4 percent in 2014, and the rate of uninsured fell from 20.4 percent to 11.9 percent in Kentucky.
Delaware, Washington and Colorado rounded out the top five with the sharpest declines in uninsured rates.
All 10 states that report the largest declines in uninsured rates expanded Medicaid and established a state-based exchange or state-federal partnership, Gallup reported, signaling key factors to success.