This update is quite feeble, cause I've hardly been doing my research. Anyhow, I'll add what I've found. My running total from the last post was 45199. In the comments, Kev from Saigon Nezumi guesses around 3,000 Americans in HCMC -- until anyway says otherwise, thats what we'll stick with. I believe it was Henno who added that there are between 30-45 South Africans, so in the diplomatic nature of this whole enterprise, let's say 35. Speaking to Filipino friend Jerry, he reckons around 200, most in the entertainment industry.
Three new countries added takes the total to 48434. I want to now take into account a variable, which in turn means the accuracy will decrease somewhat, hopefully not spiralling into a shambolic waste of everybody's time. I'm happy with 35,000 for the Koreans, beacuse the embassy said that was estimated. Other figures used in the first post were only souls registered with their embassies, but it's hard to judge exactly what % of what countries may have more strays etc. Some think it's close to 50% of foreigners who don't register with their embassies. I'm gonna take a figure of 40%, to be conservative, excluding the figure for the Koreans. So, ready?
48,434 (running total) - 35,000 (the Koreans) = 13,434
40% of 13,434 = 5374 (estimated number of unregistered souls)
13,434 + 5374 = 18,808 (TFW's new estimate of non-Korean foreigners)
18,808 + 35,000 (the Koreans) = 53,808
So, my new running total is 53,808.
Still seems to be a shy total. More work required.