I checked the 1890 Scranton and Carbondale is listed as being included (see attached) so it probably is included in other Scranton directories as well. Go to the Scranton directories; select the year you're looking for; go past the ads at the beginning and find the directory's title page (this page was the 19th image) to see if Carbondale is included. Caution: the A-Z listings could be all together, or it may be that the Scranton A-Z listings are in the front of the book, and Carbondale's listings may be listed separately in the back.