Recently I've been using 1890 era city directories to fill in some gaps during that time period in my research. Directories can augment what is found in census records. While directories do not mention every person living in the household, they can list widows (and who their deceased husbands were) and may indicate adult children living in the household and where they work.
Directories may also give more specific information regarding place of employment than the census. Census records frequent just list the type of work--a directory may name the employer specifically.