That's according to the 2013 Gallup Well-Being Poll.
Mississippi topped the list with an estimated 35.4% of its residents considered to be obese.
Montana's 19.6 % obesity rate was the lowest.
Overall, the national obesity rate increased to just over 27%, while those considered to be morbidly obese reached an all time high of 3.8%.
Arkansas is listed as the fifth largest obese state.
In other health news, requiring young children attending daycare to get flu shots might cut down on the number of kids hospitalized with the illness.
A new study from the Centers Of Disease Control compared the flu vaccine and hospitalization rates for states who require daycare children to be immunized.
They found the number of young children who got flu shots went up significantly and the hospitalization rate went down 12%.
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