Social stratification refers to a system by which a society ranks categories of people in a hierarchy. Geography (or where a person lives) plays a significant role in access to education and other public services, opportunities for social interactions. There is a spatial sorting of individuals by income, and the correlated patterning of economic resources and opportunities. This spatial sorting results from many regional factors, including income inequality, suburbanization patterns, the age and quality of housing stock, school and municipal boundaries.
So, where do you live in most cases defines your society rank category.
