My new issue of Paste arrived today (yes, its the only music magazine I subscribe to and no, I am not a dad) with a feature that is titled, America's 40 Best Music Venues. The magazine asked for submissions from readers. In the end, there were 500 different venues nominated. The magazine "weighted history, setting, sound, character, comfort, atmosphere, vibrancy, uniqueness, and their roles in helping launch careers."
Los Angeles has 3 venues on the list: The Troubadour, Largo, and Hotel Cafe. Other venues on the list are Stubbs (Austin), Tipitina's (New Orleans), The Fillmore (San Francisco), Bowery Ballroom (NYC), Red Rocks (Morrison, CO), Shubas (Chicago), and Maxwell's (Hoboken, NJ).
I have only been to 8 of the 40 venues, but I imagine living for any period of time in San Francisco, Seattle or Austin would make that number change drastically.