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Sanborn Fire Insurance Maps
The Sanborn Map Company helped fire insurance companies set rates in the late 19th and early 20th centuries with these detailed maps of each built structure, its use, dimensions, height, building material, and other relevant features (fire alarms, water mains and hydrants, for example).
Other Historic Maps
Philadelphia Geohistory Network
Scanned historic maps from the Philadelphia Area Consortium of Special Collections Libraries.
DOR Historic Streets Index
Changes to the names of certain streets, alleys, and courts were first effected by an ordinance dated September 1, 1858. A provision of this ordinance was an alphabetical index of former names, together with the location of the street and the new name given to it. By an ordinance of February 23, 1897 names of intermediate streets were indexed by old name, location and new name.
Genealogy of Philadelphia County Subdivisions
Maps of Philadelphia wards as they've changed.
Map 38. "Philadelphia, Pennsylvania." 1916. Sanborn Fire Insurance Maps, 1916- 1922 - Pennsylvania.
Retrieved from http://collection1.libraries.psu.edu/cdm/compoundobject/collection/maps1/id/16055/rec/1