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This study explored differences in activity travel behavior within the millennial generation to understand better how their choices might shape transportation systems of the future. Through the estimation of a generalized heterogeneous data model on a mobility attitude survey data set targeting millennials, this study investigates heterogeneity among millennials with respect to their driver’s license–holding status, vehicle ownership, and commute mode choice. After self-selection effects are accounted for, age, parenting status, and location of residence have a substantial and statistically significant influence on automobile-oriented mobility choices. Millennials seem to become more automobile-oriented as they age and gain economic resources. Parenthood is associated with an increase in driver’s license holding and personal vehicle ownership; however, in general, it does not seem to have a direct effect on commute …