This literature review aims to address the ongoing erasure of LGBTQ+ people in datasets by comparing public and private databases and measuring how often SOGI data are collected and which specific SOGI questions are asked. We examine whether data were collected based on the following categories: sexual orientation (lesbian, gay, bisexual, queer, etc.); transgender identity; nonbinary identity; two-spirit identity; and intersex status. The goals of this document are to visualize data invisibility and assist researchers and activists in accessing datasets on LGBTQ+ populations.