Chicago street numbers are wonderfully orderly, and we can thank the Chicago City Council for passing an ordinance in 1908 that established numbering rules and systems where chaos once reigned. If you’ve visited Chicago or call it home, all you need are coordinates (the north/south/east/west blocks) to find a specific address. The new numbering system took effect on September 1, 1909, and if you’re really lucky, you can find buildings with both numbers.
Buildings with both numbers are pretty uncommon. In the 25 years I called Chicago home, I only found three buildings with both street numbers intact. The older street number is usually reflected in a stained glass transom window above the door, as in the three-flat at 1107 S. Racine.
Earlier this week in Lincoln Park I found this on the 2000 block of N. Dayton. Squeal. What a cool surprise.
Want to nerd out and learn more about the renumbering plan and implementation? You can read up on both here.