International audienceIn social sciences, laws result from interrelationships between social facts that can be frequently observed. These laws are not universal as they can be in physical sciences. However, once observed and experimented, regular events can lead to the recognition of laws. This is what we propose to do, following the principles of Claude Bernard's experimental method, in order to deal with two demogeographic laws of politics : the law of number and the law of differential. Hence we will see how useful for political science population geography can be.Dans les sciences sociales, une loi peut se définir comme le constat de certaines régularités dans les interrelations entre les faits sociaux. Ces régularités observées, puis v...