Bars categorized by the kind of patrons who frequent them:
Bicycle messenger bars, where bike messengers congregate; these are found only in cities with large bike messenger communities
Biker bars, which are bars frequented by motorcycle enthusiasts and (in some regions) motorcycle club members
Cop bars, where off-duty law enforcement agents gather
College bars, usually located in or near universities, where most of the patrons are students
Gay bars, where gay men or women dance and socialize
Mixed gay/straight bars, mainly targeting bisexuals
Neighborhood bars, a bar that most of the patrons know each other; it is generally close to home and is frequented regularly
"Old man" bars, whose clientele are mainly long-time male patrons who know each other well; since most patrons are retired, they often begin drinking much earlier in the day, consume inexpensive beer/whisky and may spend much of the day chatting, reading the newspaper, and watching TV
Sailor bars, usually located in waterfront areas near commercial docks or naval bases
Singles bars where (mostly) unmarried people of both sexes can meet and socialize
Sports bars, where sports fans gather to cheer on their favorite teams with other like-minded fans
Women's bars