News Science Which States Are the Most Obese? By Mary Jo DiLonardo Senior Writer University of Cincinnati Mary Jo DiLonardo covers a wide range of topics focused on nature, health, science, and anything that helps make the world a better place. our editorial process Mary Jo DiLonardo Updated June 05, 2017 Prevalence of Self-Reported Obesity Among U.S. Adults by State and Territory, BRFSS, 2014. Behavioral Risk Factor Surveillance System, CDC Share Twitter Pinterest Email News Environment Business & Policy Science Animals Home & Design Current Events Treehugger Voices The obesity rate in the United States has stabilized, but more than one-third of Americans are still obese, according to new statistics from the Centers for Disease Control and Prevention. According to a state-by-state data analysis, Arkansas, Mississippi and West Virginia had the highest obesity rates (35 percent or higher) in the country. Colorado, the District of Columbia and Hawaii had the lowest obesity rates. No state had an obesity rate of less than 20 percent. The Midwest had the highest prevalence of obesity (30.7 percent), closely followed by the South (30.6 percent). The lowest obesity rates are in the West. Obesity was measured using body mass index (BMI), a ratio of weight to height. The definition of obesity is a BMI of 30 or higher. The information was collected as part of the CDC's Behavioral Risk Factor Surveillance System, an ongoing telephone survey conducted by state health departments with help from the CDC. Each person self-reported his or her weight and height. (Researchers note that self-reporting may underestimate actual obesity rates.) To find your state's obesity rate, check out the CDC's state-by-state data.