Bamako is one of the fastest growing cities on earth both in terms of population and terrain, having grown from 210 ha in 1918 to 26,750 ha in 2014, over half of that growth in just the last 20 years. This expansion occurred so rapidly through the annexation of what had previously been peripheral villages into new city Communes under the government of the District of Bamako. In the newest neighborhoods, homes are typically built to lodge specific subsets of extended families that, in previous generations, shared a single compound‐style habitation. This paper asserts, as did Setha Low, that by “attend[ing] to the social relations, symbols, and political economies manifest in the city”, including type of habitat and accompanying lifestyle, core processes of fundamental culture change can be discerned (1996: 384). It argues that the built environment of the extended family directly impacts how husbands, wives, and children interrelate, think about, and talk about each other. Our research found that families comprised of polygynous men who live with all their wives and children in the same household use different kin terms for each other than do members of polygynous families that live in separate, matrifocal households. During the same two decades, participation in the educational system through the tertiary level dramatically increased as did exposure of Bamakois to the globalizing flows of television, internet, and international travel, as formulated in Appadurai 1996. Ferguson's 1999 formulation of theories of cosmopolitan style serve as an analytical tool for exploring these influences on individual practices and choices in the urban setting. Cosmopolitan styles are also theorized to behave like linguistic pidgins that become fully elaborated languages (creoles) when they become the native tongue of the next generation (Hannerz 1992). As the youth of the 90s become the home‐owners of the 21st century, blending of the local and the global can be seen in the structuring of the neighborhoods, the ways that houses are built, spatially organized, and inhabited (Friedman 1994, 2004, Lewellen 2002). Combinations of cosmopolitan flows of ideas, information, people, and money that go into the production and reproduction of city households are the infrastructure of discernible culture transformations, not only in Bamako but in other West African cities. A concluding comparison of cosmopolitanism in Bamako to similar processes in other West African cities is discussed through Diouf's work in Dakar, as well as Gott's and Clark's in Kumasi.