1829, 1856, 1897, 1984 Otsego County Maps

The My Genealogyhound web site has this map from 1897 that seems to list all the post offices, railroads, and streams.

http://www.mygenealogyhound.com/maps/New-York-county-maps/NY-Otsego-Coun...

Links to other county maps can be found at the page listed below.

http://www.mygenealogyhound.com/maps/New-York-county-maps/New-York-count...

The Library of Congress link to the 1856 map is given below or use link at bottom of page.

https://www.loc.gov/item/2013593259/

The Wikipedia article for Otsego County is also linked below.