Objectives: The purpose of this study was to investigate the relationships of family history of alcoholism (FH+), depression, and adult attention-deficit/hyperactivity disorder (ADHD) with drinking, and to investigate factors affecting drinking among drunk drivers. Methods: Data from a community addiction counseling center were used for analysis. This study involved 320 subjects and the analysis of the collected data included frequencies, t-test, and multiple regression. Results: First, there was a statistically significant difference in drinking level among the groups according to the drunk driver’s age, religion, education, and number of drunk driving incidents. Second, 48.4% of the subjects were in the danger drinking group and 31.6% in the alcohol addiction group. In addition, 42.2% of the subjects were in the depressed group and 5.6% had adult ADHD. Third, as a result of examining the influential factors of drinking among drunk drivers, FH+, depression, and adult ADHD had a statistically significant effect. Conclusion: FH+, depression, and adult ADHD are risk factors for drinking among drunk drivers. These findings can be used to develop tailored intervention programs for alcohol and mental health problems among drunk drivers.