1940 Milwaukee City Directory
1940
Frank isn’t directly listed in this city directory, but I know he still lived at 2630 N Buffum St. His son, Frank E Zalewski, Jr, is listed in the directory. You can see the “2” after Frank Jr’s name, which means 2 people were living there. Interesting to notice, Frank’s apartment didn’t have a phone in it as is noted by the little bell icons.
Source: Wright's Directory of Milwaukee