A rundown of all the JLA members, in the order that each of them joined the first time...
Flash (Barry Allen)
Black Canary
Aquaman
Martian Manhunter
Green Lantern (Hal Jordan)
Green Arrow (Oliver Queen)
Atom
Batman
Hawkman (former JSA member)
Elongated Man
Hawkwoman (former JSA member)
Red Tornado
Firestorm
Zatanna
Vixen
Steel
Vibe
Gypsy
Blue Bettle
Captain Marvel
Dr. Fate
Guy Gardner
Mr. Miracle
Dr. Light
Booster Gold
Captain Atom
Rocket Red
Fire
Ice
Animal Man
Flash (Wally West)
Wonder Woman
Metamorpho
Crimson Fox
Orion
Lightray
Blue Jay
Silver Sorceress
General Glory
Superman (as a full member)
Bloodwynd (who was actually Martian Manhunter)
Maxima
The Ray
Maya
Tasmanian Devil
Hawkman (Thanogarian version)
Nuklon
Obsidian
Ice Madien
Artemis
Blue Devil
Mystek
Green Lantern (Kyle Rayner)
Tomorrow Woman
Green Arrow (Connor Hawke)
Aztek
Plastic Man
Zauriel
Big Barda
Oracle
Huntress
Steel (John Henry Irons)