Fairfax is a village in Hamilton County, Ohio, United States. It is a suburb of Cincinnati. The population was 1,768 at the 2020 census. Fairfax incorporated as a village in 1955 to head off annexation from neighboring Cincinnati but remained connected to Columbia Township after incorporating. On January 1, 2010, it withdrew from Columbia Towns…Fairfax is a village in Hamilton County, Ohio, United States. It is a suburb of Cincinnati. The population was 1,768 at the 2020 census. Fairfax incorporated as a village in 1955 to head off annexation from neighboring Cincinnati but remained connected to Columbia Township after incorporating. On January 1, 2010, it withdrew from Columbia Township by forming a paper township, due in part to city residents' low tax contribution compared to their influence on township elections.