Quote Originally Posted by antongast View Post
Does that mean that all the north-south addresses on the east side were changed again after 1921? If, for example, the house on the NW corner of Chalmers and Essex went from 101 North Chalmers to 501 Chalmers, wouldn't every address on Chalmers all the way up to Seven Mile have to be bumped up by 400 as well?
Yes, several blocks on the eastside were renumbered again after 1921. However,, the 1921 addresses jumped from 500 to 1000 at Jefferson, so only the blocks south of Jefferson were renumbered.

So, for example, my grandparent's house, which had been 136 S. Chalmers [[all these addresses are approximate as I don't remember the actual addresses anymore) was renumbered to 476 Chalmers. My aunt later bought a house further up Chalmers between Freud and Jefferson, years after these address changes had been made. Her house was numbered in the 800s, but there were still old numbers painted on the house that showed an address in the 400s.