Current JLA

  Superman       Batman       Wonder   Aquaman             Flash III                       Green           Martian
                                           Woman                            (Wally West)                Lantern IV     Manhunter
                                       (Diana Prince)                                                         (Kyle Rayner)

Justice League One Million

   Superman        Batman        Wonder         Aquaman      Flash        Atom         Starman       Hourman         Hawkman
                                              Woman

Associates

            
  Artemis         Batgirl        Big Barda   Blue Beetle  Booster Gold  Deadman       Fire        Flash I    Green Lantern I     Huntress        Jade
     
  Laurel      Mister Miracle       Robin          Spectre      Supergirl      Vixen       Wonder     Zatanna            Hawkman     Hawkgirl
                                                                                                                          Girl
 
Plastic Man    Wildcat    Kid Flash    Max Mercury

There are, of course, many more characters in the DC universe that have at times been a part of the Justice League, in different incarnations, or have been associates and allies to the League.  I have only listed a few to inform about some of the members, many of which appear in at least one of my fanfiction stories.  The internet has many other, more complete sources of League membership.

Rogues

    Bizarro        Brainiac      Dr. Destiny      Extant      Lex Luthor     Joker                   Neron                    Parallax       Prometheus   Psycho Pirate

   Riddler

Crime Syndicate of America

       
  Ultraman       Owlman     Superwoman  Johnny Quick   Power Ring

Gods of Apokolips

   Darkseid       Dasaad            Kalibak                          Granny      Bernadeth         Lashina   Mad Harriet     Stompa                   Parademons
                                                                                   Goodness

Hyperclan

          A-Mortal                         Armek                            Fluxus          Primaid           Protex          Tronix     Zenturion            Zum

Again, there are many other villains of the Justice League.  These are just a few of the many.  You can search the internet for more complete lists of villains.