We are grateful to the Government of Sierra Leone, UNFPA, DFID, Irish Aid and UNDP for funding the 2015 population and housing census. Thanks to the National Electoral Commission (NEC) for providing vehicles to support the cartographic mapping. We thank the security forces for providing the required security during the entire enumeration process. Our gratitude to the media and to civil society for publicizing the census activities. We also thank the chiefs and other local authorities, as well as the entire people of Sierra Leone, for their cooperation.