This article presents evidence that factors in rural areas influence migrant integration into China's cities. We argue that the value of the rural registration influences migrants' decision-making and identities by creating a cost to registration transfer to the city, and that the rural land system interacts with the household registration system to inhibit migrant integration. We test novel hypotheses derived from a simple model of migrant integration, finding connections between rural sending area factors and migrant integration in the city. We test these hypotheses using survey data from two surveys of rural-to-urban migrant workers and publicly available economic data. We find that migrants from areas with higher levels of economic development are less likely to desire registration transfer to the city. We also find that landholding and weaker rural and rights are associated with lower levels of social integration in the city.