From the 2016 USRDS report (Volume 2, Chapter 2) which gives the numbers from 2014:"On December 31, 2014, there were 678,383 prevalent cases of ESRD; ... 63.1% of all prevalent ESRD cases were receiving hemodialysis therapy, 6.9% were being treated with peritoneal dialysis, and 29.6% had a functioning kidney transplant"<opens calculator> 200,801 ! ... wow I would have guessed 150,000 ... safe to say well over 200,000 people are walking around with a working kidney transplant
29.6% had a functioning kidney transplant