With nearly 71 million refugees, internally displaced people (IDPs), and asylum-seekers as of 2018, forced displacement is a developing world crisis. However, evidence-based planning for IDPs is challenging because of a lack of data on their numbers, locations and socioeconomic characteristics. A new World Bank study aims to help close data gaps by using micro-level data to profile IDP populations and host communities in Nigeria, Somalia, South Sudan, and Sudan, as well as refugees in Ethiopia. The report — Informing Durable Solutions for Internal Displacement in Nigeria, Somalia, South Sudan, and Sudan — analyzes the demographic structure of IDPs and resident populations and draws on factors that trigger displacement. The study introduces socioeconomic profiles of displaced people and fills the data gaps by providing inputs for targeted program and policy interventions for long-lasting solutions to end displacement.