Tax revenue from gambling: $635.5 million
Maryland only has a handful of casinos, but it does a lot of business. Federal, state, and local governments received more than $635 million in tax revenue from casinos in 2014. Those numbers will likely rise since the MGM National Harbor casino opened in late 2016. The casino just outside of Washington, D.C., took in close to $42 million in its first three weeks of operation and is expected to pull in $700 million every year in pre-tax revenue, The Washington Post reported.