Partulid tree snails are endemic to the Pacific high islands and represent one of the most infamous examples of oceanic island mass extinctions. Although they collectively range across ~10,000 km of Oceania, half of their species diversity is endemic to a single Eastern Pacific hot spot archipelago, the Society Islands. Using a combination of museum, captive, and remnant wild snails, we obtained the first high-resolution nuclear genomic perspective of the evolutionary relationships of all five genera comprising 43 of the 104 recognized species, including many extinct or extirpated taxa, from 14 archipelagoes. We present range wide phylogenomic relationships among the five genera and a more detailed perspective of the evolutionary relationships within the genus Partula, highlighting the survival and extinction of endemic Society Island Partula from the well-studies islands of Moorea and Tahiti.