They haven't got all the French censuses available yet. The Aisne censuses on Ancestry go from 1794 to 1911 but the database titles in English and French don't reflect that. Haut Rhin 1866 only so far. Belfort 1836-1911. Doubs only 1906-1911 so far. In the years you want, there were French censuses in 1872, 1876 and 1881. FamilySearch has indexes to some of the 1876 census (link below).
https://www.familysearch.org/wiki/en/France_Census