Column 12: Usual residence (location):
The usual location of residence is the district in which the person normally lives, meaning at least for 6 months, or else the district where the individual decides to stay if she has lived there for less than 6 months.
The usual location of residence is already marked on the first page of the questionnaire, so the column 12 is only for visitors for whom you mark the name of the district, if their usual location of residence is in Cameroon or the name of the country if the usual location of residence is outside of Cameroon.