Empirical analyses of public corruption focus predominantly on international differences; regional differences in public corruption within a single country receive little attention. We empirically investigate the effect of public corruption in the United States on state bond ratings, which previous research shows are inversely related to net interest costs on public debt. After controlling for various economic influences on bond ratings, we find that more corrupt states have lower bond ratings, which implies that taxpayers in more corrupt states face a negative pecuniary externality by paying a premium for debt.