Work in the mills brought many immigrants to Rockville, particularly during the Civil War expansion period, 1860-1875, when many German immigrants arrived and new businesses catering to the German community opened along Village Street.
Today, most of the city has been designated as the Rockville Historic District."
And so I found an 1895 map of Rockville and located where Charles Pfunder and William Pfunder lived according to the census.
I am assuming now, that the mill they worked at would be the Springville Manufacturing Company. I know that they used to work in a fabric mill, and it is right across the street. A drawing of the mill is found on the map:
So, I also searched for a picture of the mill online and found this via: