Fair Oaks is a unincorporated community in Sacramento County, California, United States. It is part of the Sacramento metropolitan area. For statistical purposes, the United States Census Bureau has defined Fair Oaks as a census-designated place. The population was 32,514 at the 2020 census, up from 30,912 at the 2010 census. The Fair Oaks zip code is 95628 and its area codes are 916 and 279. From Wikipedia