This paper analyses the local determinants of the electronic participation to the “Grand débat”. First, we highlight the spatial heterogeneity of the participants using their zip code. Second, we use an econometric approach to assess the local determinants of the general participation and the participation on each of the four topics of the “Grand débat”. The results show that the median standard of living and the education level are the main determinants of the general participation, whereas some specific variables explain the participation of each of the four topics.