The Sanborn Fire Insurance Maps
The Sanborn Company began making fire insurance maps in 1867 when founded by Daniel Alfred Sanborn, a surveyor from Somerville, Massachusetts. The Sanborn Map Company created maps for fire insurance assessment in the U.S. and within several decades became the largest and most successful American map company. (from
Wikipedia)
We have "hand colored" in the maps to provide more detail and context; structures in brick red are private residences, and structures in violet are commercial, Pullman Company, or public buildings.
Other Sanborn Maps
1897
1938