In which city is 'Frasier' set?

Who co-created 'Seinfeld' with Jerry Seinfeld? Who played Elaine Benes in 'Seinfeld'? In which city is 'Cheers' set? In 'Cheers', what is the name of the bar owner played by Ted Danson? What is the name of Frasier's brother in 'Frasier'? In 'The Simpsons', what is the name of the town where the family lives? Who created 'The Simpsons'? Where does Homer Simpson work?