(HealthDay News) — More than 20 states have obesity rates topping one-third of their population, and six states saw a rise in obesity rates last year, according to two new reports.

One report from the CDC based on nationwide self-reporting of height and weight in 2013, indicates that obesity rates range from a high of 35% in Mississippi and West Virginia to a low of 21.3% in Colorado. Only seven states — California, Colorado, Hawaii, Massachusetts, Montana, Utah and Vermont, as well as the District of Columbia — have fewer than one-quarter of adult residents who are obese.

The 20 states with obesity rates of 30% or more are Alabama, Arkansas, Delaware, Georgia, Indiana, Iowa, Kansas, Kentucky, Louisiana, Michigan, Mississippi, Missouri, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas and West Virginia. 

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The South and the Midwest had the highest prevalence of obesity at just over 30%. The Northeast had obesity rates of 26.5% and the West weighed in at just under 25%.

The State of Obesity report from the Trust for america’s Health (TFAH) and the Robert Wood Johnson Foundation showed that adult obesity rates inched up last year in six states — Alaska, Delaware, Idaho, New Jersey, Tennessee and Wyoming — and didn’t come down in any. 

Although the rate of increases is beginning to slow after decades of growth, “rates remain far too high,” the researchers added in a news release.