As I reviewed the Census for the various years, learning what information is added as each version of the Census progresses. Then running into 1890. What do you do to see where the family was in 1890. The households changed over time, where were they in 1890.
The first place, in a broader search, I remembered City Directories. Looking in the Baltimore City Directory, there is David R. Howard.
The address, 939 St Paul, is consistent the previous and following Census Record.
Will then look for the other family members in the same City Directory. This will also help see household members who were in the 1880 Census, but not in the 1900 Census.
This is a reminder to Search Broadly.