This study investigated environmental predictors of teenagers' alcohol- impaired driving, such as drinking location and alcohol source. Data for this study were part of the 15 Communities Mobilizing for Change on Alcohol Project. Relationships between drinking-driver status, alcohol source, drinking location, alcohol consumption, and individual demographics were determined for the full sample as well as for males and females separately, using mixed-model, logistic regression. Analyses were restricted to high school seniors who were drivers and who consumed alcohol within the last 30 days (N = 1,914). For males and females, the risk of alcohol-impaired driving rose significantly with increases in both the number of binge-drinking events and estimates of the number of drinks required to impair their driving. Drinking location was important in that students who drank outdoors or in a moving car or truck were at significant risk for drinking-driving. Drinking- driving risks specific to females were number of drinking occasions and drinking at someone else's house. Strategies to prevent drinking-driving among teenagers need to consider drinking patterns as well as drinking locations for both males and females.