The best listing of cemeteries in Oswego County I've found to date is on the Oswego County Tourism page. This page also provides an address and/or directions. Cemeteries are grouped by town which I have found extremely helpful. Also listed are the alternate names if applicable.
I believe all of the cemeteries in the county are now online at Find-A-Grave. There are 179 cemeteries listed so there must be several duplicates and many tiny family plots listed.
Oswego County GenWeb also has a listing organized by towns, however there are no addresses. Instead they provide the address and phone number for the Oswego County Historian. A list of links to cemetery transcriptions can be found here. Also check the GenWeb page for more information to help fill out your family history.
Also at GenWeb you can find a form to request a records search. Besides cemetery records you may request census and other records. There is a fee.
An incomplete, alphabetical listing of Oswego County Cemeteries can be found at e-Podunk. Clicking on a cemetery name will take you to a map.
Transcriptions of a few small cemeteries can be found on Internment.net.
New York Gravestones has just a few pictures each from a short list of Oswego County cemeteries.
Northern New York Historical Newspapers
Old Fulton History (Searchable papers from around the state.)
Oswego County Newspapers, LOC, Chronicling America
Oswego County Today
Syracuse Post Standard