the population of saudi arabia as of july 2013 is estimated to be 26.9 million, including between 5.5 million and 10 million non-nationalized immigrants, though the saudi population has long proved difficult to accurately estimate due to saudi leaders' historical tendency to inflate census results. saudi population has grown rapidly since 1950 when it was estimated to be 3 million, and for many years had one of the highest birthrates in the world at around 3 percent a year.