This empirical paper studies the impact of unskilled immigration from neighboring countries on the internal migration patterns of native Thais at the provincial level. We find that provinces with more immigrant workers also have a higher inflow of natives than provinces with fewer immigrant workers. This paper also studies the impact of unskilled immigration on the structure of production and employment. We find that provinces with more immigrant workers have a relatively small agricultural sector, whether measured by production or employment, than do provinces with fewer immigrant workers.