Out of curiosity, I decided to build a list of Golden Age female superheroes and this is the list so far. Feel free to point out anyone I missed:
1939 - Crimson Rider, Magician from Mars
1940 - Alice of the Winged People, Black Widow (Timely Comics), Fantomah, Headless Horseman, Invisible Scarlet O'Neil, Lady Luck, Mighty Woman, Miss X, Panther Woman, Red Tornado, Woman in Red
1941 - Black Cat, Black Widow (Holyoke Publishing), Blue Lady, Bulletgirl, Flame Girl, Girl Squadron, Hawkgirl, Kitten, Lady Fairplay, Lady Satan (Harry 'A' Chesler), Madame Strange, Margo the Magician, Miss America (Quality Comics), Miss Fury, Miss Owl, Miss Victory, Mother Hubbard, Nelvana of the Northern Lights, Pat Patriot, Phantom Lady, Ranger Girl, Rocketgirl, Silver Scorpion, Spider Queen, Super Ann, USA the Spirit of Old Glory, Wildfire, Wonder Woman
1942 - Black Angel, Girl Commandos, Liberty Belle, Lightning Girl, Mary Marvel, Señorita Rio, Spider Widow, The Wing
1943 - Black Orchid (Harvey Comics), Guerilla Girl, Lady Satan (Harvey Comics), Miss America (Timely Comics), Miss Patriot, Superwoman
1944 - Black Orchid (Consolidated Book Publishers), Black Venus, Catgirl, Diana the Huntress, Dotty Whirlwind (aka Dotty Virvelvind), Miss Espionage, Purple Tigress, Spider Woman, Veiled Avenger, Will O' The Wisp
1945 - Comandette, Freckles Marvel, Ghost Woman, Mysta of the Moon, Polka-Dot Pirate, Yankee Girl (Four Star Publications)
1946 - Blonde Phantom, The Flame, Futura, Golden Girl (Spark Publications), Lady Fantax, Magga the Magnificent, Miss Fear, Miss Masque, The Torch (aka la Antorcha)
1947 - Acromaid, Atoma, Black Canary, Electro Girl, Iron Lady, Marvel Maid, Moon Girl, Namora, Phantom Maid, Undercover Girl, Vampire, Varga, Yankee Girl (Harry 'A' Chesler)
1948 - The Cat (aka de Kat), Elektra, Gimmick Girl, Golden Girl (Timely Comics), Miss Devil (aka Miss Diavolo), Sun Girl, Val Venture, Venus
1949 - The Queen of Spades (aka la Dama di Picche)
1950 - The Avenging Plainswoman (aka la Llanera Vengadora), Calamity Kate, Darna, The Silent Three, TNT Tina
1951 - Black Phantom, Corsair Queen, Doll Girl
1952 - Galaxy Gals
1953 - Sri Asih, Zina of Koroka
1954 - Princess Bintang (aka Putri Bintang), Tomboy