Literary historians of the United States broadly agree that, at some point during the nineteenth century, New York City overtakes Boston as the literary capital of the US. Data recently released by the Library of Congress (LC) allows us to assess this historical claim in new ways, but not in the format in which it was originally released. By converting this data to a form useful for computational literary studies, I have evaluated this geographic shift, and made it possible for other scholars of nineteenth-century US literatures to use the same data for a wide range of purposes.