The late eighteenth and early nineteenth centuries were a period of dramatic economic and population change for the Spanish Caribbean, including Puerto Rico. This note describes a unique collection of population data that sheds nuanced light on older research themes and promises to inspire new inquiries. These aggregate population data, or padrones, commissioned by the Spanish Crown and now more widely available and usable than ever before, offer details on Puerto Rico's sex, age, status, and socio-racial composition on an annual basis for the period spanning 1779 to 1802. We describe the data, their accompanying limitations, and their potential uses to advance scholarship on late-colonial Spanish America.