- Check the Encyclopedia of New York State, Olin Library Reference, F119 .E53 2005 ++
- Search the catalog for the county as a subject. e.g., Tioga County (N.Y) In the drop-down menu, select Subject Browse. Scroll through the subject-headings. Keep in mind that county histories might also discuss the towns within the county.
- Search the catalog for historical county atlases and directories
- ____ County (N.Y.) > Maps;
- ____ County (N.Y.) > Directories;
- Real property > New York (State) > ___ County > Maps
Finally, you might also contact/visit local history centers