The practice of residential genealogy can provide a rich understanding of the past, offering insights into the evolution of neighborhoods and towns over time.[3] It allows individuals to understand the historical context of their homes, from those residing in historic properties curious about their home's previous owners, to those living in newer homes interested in how their neighborhoods developed over time. The field also provides insights into broader historical shifts, such as the rise and fall of ghost towns, or what previously existed on the land now occupied by modern structures like reservoirs or cemeteries.
This form of research often necessitates a collection of 19th and early 20th-century maps, including American city, town, and county maps. Detailed cadastral maps, in particular, are instrumental in showing every building and street of a particular era. These maps frequently include the names of the residents of single-family homes, while larger buildings like apartment complexes bear the property owner's name. Additional resources such as antique city directories, census records, and phone books can greatly aid researchers in retracing both the history of any location and its inhabitants.
In the digital age, locating a specific historical building or residence has become relatively straightforward, thanks to the integration of historical map collections with modern mapping technology. Users can trace the development of structures and neighborhoods over time—sometimes spanning as much as 250 years—by merely entering an address. These digital historical maps, much like their modern counterparts, offer intricate and comprehensive views of nearly all structures of their era.