Montgomery is the only county in the United States that sells and distributes all alcoholic beverages: hard liquor, beer and wine. [snip] All states regulate alcohol by determining where, when and how it is sold through government-issued liquor licenses. Eighteen states, including Virginia, go one step further by having the state sell or distribute alcoholic beverages. In Virginia, for example, hard liquor is sold only in state stores. The District, considered an "open" jurisdiction, does not sell or distribute alcohol.
Maryland is an open state with the exception of Montgomery and three Eastern Shore counties that sell hard liquor.
Washington Post - Vintage Bureaucracy: Montgomery Doesn't Make It Easy to Buy Fine Wine, Restaurateurs Say