Several primary care organizations maintain a database of fellowship opportunities in a variety of disciplines that are available for primary care graduates. Fellowship programs are searchable by location, program type, community setting and duration. 

American Academy of Family Physicians (AAFP)  Fellowship Directory		American Osteopathic Association's (AOA)  Post Doctorial Training Directory
Academic Pediatric Association (APA)  General Pediatrics Fellowship Listing		Society of General Internal Medicine (SGIM)  Fellowship Training Directory