This is my theory.....
The area is involved in leather production.
So..... let's look at page 3 of the sequence of census pages.
We see that some people are "Skin Dresser"..... an obsolete term for workman who shaved or pared leather.
On that page we also see a Farmer who also was a Skin Dresser.
I think we are looking at the initials F S D...... for Farmer & Skin Dresser.
Or perhaps a Fur Skin Dresser