This fun colored map was included in the 1913 Detroit Recreation Survey put together on behalf of The Detroit Board of Commerce.

Oddly enough the data generated from this map came from an appraisal survey completed for the Detroit United Railway company. Not surprisingly, the railway would need to know where people were living in order to plan and project their next rail investment. We now have a Census Bureau completing regular surveys, however if we see further cuts to the Census, there very well may be a corporation that starts funding it.