Created and maintained by Mari Naomi, award-winning author and illustrator, the LGBTQ Cartoonists Database is an ever-growing list of well-known and soon-to-be-discovered cartoonists. As of this week, Mari reported over 460 names in this database, as well as almost 1,000 in their Cartoonists of Color database. That one has grown so large it has an LGBT Cartoonists of Color sub-section.
FEB. 2018 UPDATE:
As of February 21st, the Queer Cartoonists database has 708 entries. While some are still incomplete, this is still the best resource of its kind.