Here's the list of states with the most binge drinkers: Wisconsin (25.6% of the population), Nebraska (22.3%), North Dakota (21.9%), Massachusetts (21.7%), and then Iowa and Montana (both with 21.5%).
The study was conducted by the Centers for Disease Control and Prevention and covered in The Daily with lots of pretty graphics. A binge drinker is defined "as consuming four or more drinks for women and five or more drinks for men over a short period of time."
The study highlights some surprising new data. From the CDC:
While binge drinking is more common among young adults aged 18—34 years, binge drinkers aged 65 years and older report binge drinking more often—an average of five to six times a month. Similarly, while binge drinking is more common among those with household incomes of $75,000 or more, the largest number of drinks consumed on an occasion is significantly higher among binge drinkers with household incomes less than $25,000—an average of eight to nine drinks per occasion, far beyond the amount thought to induce intoxication.