There are numerous challenges to accurate population data, some national statistics agencies don’t release this openly, some do not have the resources to create accurate population information.
Kuna changamoto nyingi kupata taarifa sahihi za idadi ya watu, baadhi ya mashirika ya takwimu kitaifa hayatoi hizi taarifa kwa uwazi, baadhi hawana rasilimali za kukusanya taarifa sahihi.