This paper investigates longevity inequality across U.S. states by modelling and forecasts mortality rates via a forecast reconciliation approach. Understanding the heterogeneity in state-level mortality experience is of fundamental importance, as . A key challenge of multi-population mortality modeling is the curse of dimensionality, and the resulting complex dependence structures across sub-populations. Moreover, when projecting future mortality rates, it is important to ensure that the state-level forecasts are coherent with the national-level forecasts.<img src=“