Abstract: Studies on the impacts of hurricanes, tropical storms, and tornados indicate that poor communities of color suffer disproportionately in human death and injury. Few quantitative studies have been conducted on the degree to which socially vulnerable populations are impacted by flood events. We address this research void by analyzing 832 county-wide flood events in Texas from 1997 to 2001. Specifically, we examine whether geographic localities characterized by high percentages of socially vulnerable populations experience significantly more casualties from flood events, adjusting for characteristics of the natural and built environment. Zero-inflated negative binomial regression models indicate that the odds of a flood casualty increase with the level of precipitation the day of a flood event, flood duration, property damage caused by the flood, population density, and the presence of socially vulnerable populations. Odds decrease with the number of dams, the level of precipitation the day before a recorded