This is an amazing job journalists from CPI, Quartz and AP did.
After Hurricane Maria devastated Puerto Rico in 2017 Hurricane Maria devastated Puerto Rico, the government insisted that only a few dozen people had died. With no reliable official death toll, the journalists teamed up to build a database of victims that list them by name and includes demographic details, such as age, place of residence, and in most cases, cause of death.
http://periodismoinvestigativo.com/2018/09/the-deaths-of-hurricane-maria/