This article is organized into three main sections. First, we underscore the importance of our findings within existing discourses on youth identity and space. Second, we look more deeply at how youth identities are shaped by cultural and spatial conditions within multiethnic suburbs and transnational families, using specific examples from the Silicon Valley in the U.S. and Hsinchu Science Park in Taiwan. Finally, we extend the case studies to investigate how youth themselves use the materials of their everyday suburban environments to express their cross-border identities.