The report released by the Trust for America's Health and the Robert Wood Johnson Foundation found Arkansas had an obesity rate of 35.9 percent while Colorado had the lowest at 21.3 percent.
The 12th annual report found that rates of obesity now exceed 35 percent in three states, Arkansas, West Virginia and Mississippi.
The data showed that in most states, the rate of adult obesity is not moving.
The 2014 survey found that in 22 states, 30 percent or more of the population was obese. They were mostly in the South and Midwest.
Obesity puts some 78 million Americans at an increased risk for a range of health problems, including heart disease, diabetes and cancer.