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Long-distance travel research is limited because of the lack of robust data and the complexity of defining a long-distance trip. The patterns of infrequent long-distance trips are poorly understood especially compared with the better studied (and understood) local daily travel patterns. This study contributes to filling that gap by investigating the factors that affect the frequency of long-distance trips of Californian millennials (18–34 years old, in 2015) and members of the preceding Generation X (35–50 years old, in 2015). Data collected with an online survey administered in fall 2015 are used to study the mobility of these age groups. The survey collected information on several travel-related variables, including the number of long-distance trips (defined as trips longer than 100 miles, one way) made by various modes during the previous 12 months. The authors estimate six negative binomial regression models of …