Here is an extensive compilation of all LGBTQ+ Archives in the United States and Canada.
The Society of American Archivists' Lesbian and Gay Archives Roundtable (LAGAR) sponsors events, a listserv, and an extensive directory of lgbt archival holdings in the US and Canada. Though no longer updated, their
Lavendar Legacies Guide was "the first formal and comprehensive guide to primary source material relating to the history and culture of lesbian, bisexual, gay, and transgendered (LBGT) people held by repositories in North America."