F as in Fat 2010 District of Columbia Ranks Third Least Obese in the Nation – Washington, D.C. June 29, 2010 – District of Columbia was named the third least obese state in the country, according to the seventh annual F as in Fat: How Obesity Threatens America's Future 2010 report from the Trust for America's Health (TFAH) and the Robert Wood Johnson Foundation (RWJF). The state's adult obesity rate is 21.5 percent, and, in District of Columbia women are more obese than men at 25.4 percent. Now more than two-thirds of states (38) have adult obesity rates above 25 percent.
There’s an interactive map of all the states here. Note that DC is the only “state” that reduced its obesity rate.