In this chapter, I revisit conclusions that I made in earlier ethnographic research on Mexican Enclaves in Southeastern Pennsylvania, and examine population changes since early 1990s. The Mexican-origin population in this region has continued to increase substantially, as will be discussed. Drawing on available decennial census data, I address immigration trends and demographic changes in two communities in the area. I also draw on ethnographic field notes and present two case studies to illustrate demographic changes that have occurred as a result of Mexican settlement. One of the case studies is an immigrant family, and the other of a recently arrived worker, an undocumented migrant.