The city of Savannah owns and operates five cemeteries: Colonial Park, Laurel Grove North, Laurel Grove South, Bonaventure, and Greenwich. An online database of the burials in those cemeteries is available from the city of Savannah.
You can search an individual cemetery or all five of the cemeteries at once. Clicking on a name in your hit list will reveal additional detailed information. Given the historic nature of the Savannah cemeteries, this is a treasure of information.