This lecture presents data extracted from historical documents related to the urban history of Lausanne, focusing on street names, property owners, family names, and residents in the 18th and 19th centuries. It includes information on census records, cadastre maps, and directories, shedding light on the city's development and population. The lecture delves into the social structure, professions, and origins of Lausanne's residents, providing insights into migration patterns, urban planning, and historical demographics.