777 Woodrow Avenue?

Thanks in advance for any insights y'all: I found an old [[1930's or 40's??) envelope addressed to a relative living at 777 Woodrow Avenue, Detroit [[but no zip code or stamp or postmark, obviously was never mailed...). Is there a resource online that shows the old 3 digit addresses and their coresponding current ones??

777 would have been prior to 1921. The third block of Woodrow north of McGraw, between Milford and Monroe Place, was numbered 726 to 812. Here is a listing of that block from 1922:


Attachment 26132

Near Detroit Rep Theater?

The post 1921 address in 6377 Woodrow.

Thanks for all your help!!