Here's what we can say:
* Limited official data: There are no recent, reliable statistics on the number of French speakers in Vietnam.
* Declining use: While French was widely used in government, education, and business during the colonial era, its use has drastically decreased over the years.
* Areas of higher concentration: Some regions like Ho Chi Minh City and Hanoi might have a higher concentration of French speakers due to historical reasons and continued cultural ties.
* Limited practical use: French is generally not widely used in daily life or for business purposes in Vietnam. English has become the dominant foreign language.
Therefore, it's safe to say that the number of French speakers in Vietnam is relatively low and has been declining for decades.