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Accurate estimations of populations living in the Low Elevation Coast Zone (LECZ), and at heightened risk from sea level rise, depend on robust representations of coastal elevations and sub-national gridded population. The empirical basis for such estimates has improved considerably in the 12 years since it was first estimated that 10% of world's population, and an even greater share of the urban population, lived in the LECZ (McGranahan et al., 2007). Initial estimates were constrained in several ways, most notably by a single 10m LECZ, but also by a single urban-rural delineation. This paper updates the initial estimates with newer, improved inputs, and provides a range of estimates, along with sensitivity analyses that reveal the importance of understanding the strengths and weaknesses of the underlying data.