This book focuses on what people are doing with language in urban settings around the world. In studying situated language life in fourteen cities, from New York to Shanghai, the authors present these cities as sociolinguistic systems in their own rights, show how they are changing, reveal differences and congruencies and what can be learned for theory. Providing new perspectives on crucial themes such as language choice and language contact, code-switching and mixing, language and identity, language policy and planning and social networks, this is key reading for all in the area of multilingualism and super-diversity within sociolinguistics, applied linguistics and urban studies.