This book aims to show the importance of returning migrants in the economic and social development of their localities of origin. The aim of our research is to study the reasons for the return of immigrants and their modes of socio-economic integration in the Boli sub-prefecture. This was made possible by surveys carried out among the population and the village and administrative authorities of the aforementioned locality through a census based on the proximity method. The study identified the causes of return migration to Boli. Return migrants are important players in Boli's economic development. By showing their mode of insertion, this research indicates a development of economic activities and achievements of the returning migrant population in the Boli sub-prefecture.