I am informed that bone marrow can be found in the legs, but is that the only place as to where they are found?

Found in all bones: All bones, whether the long bones of the extremity or the relatively flat bones like the skull or pelvic bones, contain marrow. This component of bone is the soft, flexible connective tissue portion found within bone cavities. It serves as a component of the lymphatic system and functions primarily to produce blood cells and to store fat.