New York City has undergone numerous changes to its geographical boundaries over the years. An understanding of these boundaries is important in order to know what archive to search when looking for vital records. This talk shows the changes to New York City's geography and describes the difference between New York City and the City of New York. The origin of the counties and their changing boundaries, along with the early geographies of Brooklyn and Queens, are presented. Finally, the consolidation of 1898 that created the City of New York and defined the five boroughs is discussed.