New identity card applications made, produced and collected, per Kenyan county. Published in the Kenya National Bureau of Statistics' Economic Survey of 2017.
International visitor arrivals in Kenya & their purpose of visit
International visitor arrivals by purpose of visit for 2009-2016, including holiday and business visitors, visitors in transit and others. Published in the Kenya National Bureau of Statistics' Economic Survey of 2017.
Visitor arrivals & departures by continent of residence & mode of travel in Kenya
Number of reported visitor arrivals and departures by continent of residence and mode of travel, including travel by air, sea or other modes (2012-2016). Published in the Kenya National Bureau of Statistics' Economic Survey of 2017.
The Migrating for Work Research Consortium, a group of academics and government departments, provides a number of reports and fact sheets on labour migration in South Africa.
Nigeria's international migration profile, UNICEF data
Data on the legal instruments related to international migration, international migrant stock by age and gender and annual rates of natural increase. This PDF is for Nigeria's migration profile.
World Bank data on global migration and remittances. The bank's Migration and Remittances Factbook, most recently published in 2016,) provides data on immigration, emigration, skilled emigration, and remittance flows for 214 countries.