Do not look just for your ancestor’s name in that city directory. There may be a number of other items in that directory which could be helpful with your search.
Directories may include lists of churches, schools, ministers, or local officials. Some directories have additional lists of names sorted by residential address–helpful in finding neighbors. There may be additional information on local businesses, newspapers, schools, etc.
Always make certain you browse the entire directory. Do not just look for your relative’s name and quit.
And do not forget to copy down that list of abbreviations while you have easy access to it.