Quantifiable citizenship in the form of birth certificates, census forms, and immigration quotas is so ubiquitous that today it appears ahistorical. Yet before the modern colonial era, there was neither a word for "population" in the sense of numbers of people, nor agreement that monarchs should count their subjects. Much of the work of naturalizing the view that people can be represented as populations took place far outside government institutions and philosophical treatises. It occurred instead in the work of colonial writers who found in the act of counting the "vast numbers" of Indians who held her captive a way to imagine fixed boundaries between intermingling groups. Counting Bodies explores the imaginative, personal, and narrative writings that performed the cultural work of normalizing the enumeration of bodies. By repositioning and unearthing a literary pre-history of population science, the book shows that representing individuals as numbers was a central element of colonial projects. Early colonial writings that describe routine and even intimate interactions offer a window into the way people wove the quantifiable forms of subjectivity made available by population counts into everyday life. Whether trying to make sense of plantation slavery, frontier warfare, rapid migration, or global commerce, writers framed questions about human relationships across different cultures and generations in terms of population.