Residential location choice is a key determinant of activity–travel behavior, yet little is known about the reasons why people choose to move or not move residences. Such understanding is critical to being able to model residential location choices over time and design built environments that people find appealing. This paper attempts to fill this gap by developing a joint model of the choice to move residence and the primary reason behind the move. The model is estimated on the Florida subsample of the 2009 U.S. National Household Travel Survey. Model results shed considerable light on the socioeconomic and demographic variables that affect a household's decision whether to move residence and the primary reason underlying that decision.