The City of Fairfield located in Butler County, Hamilton County has a Census Class Code of C5 which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent.
This Incorporated Place has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.
The population of the City of Fairfield was 42,510 during the 2010 Census. There were 18,803 housing units on a land are of 20.9 square miles. The water area for the was reported to be 0.1 square miles. The population density was 2,030.2 people per square mile.
This boundary map for the City of Fairfield is based on information provided by the U.S. Census Bureau for the 2010 Census.