We prospectively examined the additive and interactive predictive power of psychopathy, ethnicity, individual socioeconomic status (ISES) and neighborhood socioeconomic status (NSES) for violent criminality among 424 county jail inmates. Our first aim was to replicate findings of moderating effects of ethnicity and ISES on the relationship between psychopathy and violence such that psychopathy was not related to violence among higher ISES European Americans but was a stable predictor across levels of ISES among African Americans. Secondly, we aimed to examine whether NSES moderated the relationship between psychopathy and violence in European American (EA) and African American (AA) inmates. Finally, we aimed to examine whether the relationship between psychopathy, sociodemographic factors and violence extended to Latino Americans (LA). We did not replicate the Psychopathy x ISES x Ethnicity interaction predicting violence. However, we did identify a Psychopathy x NSES x Ethnicity interaction such that psychopathy was a stronger predictor of violence at lower NSES among AA, but not among EA participants. Psychopathy did not predict violence among LA participants, and we identified a Psychopathy x Ethnicity interaction such that psychopathy was a stronger predictor of violence among EA compared to non-EA inmates.