I am a retired Long Beach Public Library librarian who has written several books on Southern California history. Besides adding my own relatives, I'm slowly transferring obituary records from the library's website to Find-A-Grave. If you're looking for someone who died in Long Beach who is not yet in Find-A-Grave please check: www.lbpl.org. Look for the Long Beach History Index. You'll also find City Directories going back to 1899, high school yearbooks and historic photos by clicking on Digital Archives on the same library site.
IF you want to learn more about Long Beach cemeteries and where your relative MAY or MAY NOT be buried you might want to look at my book "Died in Long Beach - Cemetery Tales" available on Amazon and Barnes & Noble. It has stories of those buried in Long Beach cemeteries, discusses where they died, the mortuaries that handled their remains, and the monument makers who carved their tombstones. BUT what makes Long Beach's Sunnyside and the Municipal cemeteries different from all other cemeteries is the question of whether the bodies said to be there still remain. The "cemetery wars" of the 1920s erupted, with many bodies moved, but their removal not always noted. All this and more is discussed in the 316 page, well indexed and illustrated book.
WORTH NOTING: In entering burials in findagrave I have come across several duplicate names of people buried at Green Hills Memorial Park in Palos Verdes, however, only their names are added to the findagrave record with birth and death dates listed as "Unknown." I'm pretty sure that the bodies may have been been moved from Sunnyside or the Municipal Cemetery to Green Hills with the tombstones left behind. In any case, if I've taken a picture of a tombstone or found an obituary listing Sunnyside or the Municipal cemetery I've entered it under that cemetery.