This paper presents the first results of a prototypal statistical register on the city users and the daytime population on a territory. The data on the resident population is no longer sufficient to govern the present complexity of the territories, in particular for those attractive ones, for universities sites or those with an economic vocation. Incoming and outgoing flows, daily and periodic mobility, short and long migrations, etc. are a very anthropic pressure that requires services, produces consumption of energy and land. The local government must provide: transport, energy, housing for temporary residents, etc.. Population movements also affect the quality of the social frame both in the territories of departure and arrival. This information is strategic for the optimal sizing of the collective services and the quantification of the housing needs of the cities and their hinterlands, but also for prevention and intervention plans in the event of natural disasters. The questions we are trying to answer with this register are "How many are daily these people?, Who are they?, Where do they come from?"