Cotonou is one of African cities, considered today as the moving plate of the informal entrepreunariat. With the phenomenon of "Mamas-Benz", this city knows nowadays a "boom" of the feminine informal activities which show of the vitality and the dynamics of cities African entrepreunariales. Our contribution suggests analyzing from the point of view of the sociology, two neuralgic spaces of the entrepreunariat in Cotonou, namely: the Dantokpa market and the port(bearing) of Cotonou. Two places and two spaces which testify of the entrepreunariat of a city situated in the heart of western Africa. Economic and harbour city, Cotonou concentrates numerous commercial and harbour activities. Ler weight of the informal in the feminine activities, shows that more than somewhere else the inhabitants of Cotonou begin(undertake), exchange and create. This city also has a peculiarity, it is "zémidjans" (motorcycles-taxis) which show that the inhabitants of this city understood that you should not expect for everything from the Welfare state. "Zémidjans" is young graduates of the university for the greater part and who wanted to bypass the unemployment by the informal entrepreunariat which becomes in Benin a supplier of long-lasting(sustainable) employment(use) since the frost(gel) of the recruitments in the Central Administration. Cotonou is finally, a city which knows at present an unprecedented development of the micro-credits thanks to the formal and informal structures of the microcomputing finances.