Experienced Chicago researchers know that many of the city’s street addresses were renumbered in 1909. But did you know that special postcards were printed to help with the transition? Here’s an example from the Encyclopedia of Chicago.
For those interested in the how and why of the renumbering, there is another article that goes into more detail. Trying to convert addresses and street names? Try the links on the Tools page of ChicagoAncestors.org. Here you’ll find links to address conversion guides, street name changes, an index to “Honorary Street Names,” as well as maps of the city. Don’t miss the 1910 - Rand McNally & Co.’s New Street Number Guide Map of Chicago.