American Kennel Club - The Dog's Champion - American Kennel Club Dog Breeders - American Kennel Club https://www.apps.akc.org/apps/classi...ding_breed.cfm https://www.apps.akc.org/apps/classi...arch/index.cfm
The search results probably don't carry with the links I popped in above.... play with their site a bit.... 139 yorkie breeders were shown.... but they were all over the country even though I punched in 50 miles from a San Fran zip code.
There is a lot of info available from their site. Some prep stuff to learn before getting your pup, some care stuff... clunky access but decent stuff to read.