Aggression research often relies upon convenient samples with unknown generalizability to populations of interest, potentially threatening external validity. This article details the measurement properties of the Buss-Perry Aggression Questionnaire Short Form (BPAQ-SF) and its subscales in two nationally representative U.S. samples (N = 924) and a concurrent study with U.S. college students (N = 384). The results provide useful benchmarks for generalizing BPAQ-SF results from convenient samples to U. S. adults, including distributions, reliability, and factor structure. The results also confirm basic relationships between trait aggression and key social and demographic variables such as sex, age, and socioeconomic status while establishing convergent validity with violent political attitudes. Results from the national studies closely align with those from the student sample, providing reasonable support for generalizing trait aggression elements to U.S. adults. (C) 2014 Wiley Periodicals, Inc.