In the Boston region of Massachusetts, latest available data published in 2012 reported that emergency room visits for heroin addiction was 251 per 100,000. The national average for emergency room visits for heroin is 69 per 100,000.
The Boston area also had the most emergency room visits for all illegal drugs out of all large metropolitan regions in the United States, passing cities such as New York and Chicago.
Source: Associated Press, “Health report: Mass. struggling with illicit drugs,” Boston.com, November 13, 2012.