This database is a set of directories for U.S. metropolitan areas and counties in a variety of several years. The database at present consists of directories for all states except Alaska. Directories are alphabetical lists of names and addresses. City directories will let you study the place an ancestor lived. https://www.reddit.com/user/Raymondlia/comments/itcgz1/new_york_city_directory_how_to_find_the_person/