Washington County er navnet på 31 fylker i USA. Det er landets vanligste fylkesnavn.
Washington County (Alabama) Washington County (Arkansas) Washington County (Colorado) Washington County (Florida) Washington County (Georgia) Washington County (Idaho) Washington County (Illinois) Washington County (Indiana) Washington County (Iowa) Washington County (Kansas) Washington County (Kentucky) Washington County (Maryland) Washington County (Maine) Washington County (Minnesota) Washington County (Missouri) Washington County (Mississippi) Washington County (Nebraska) Washington County (New York) Washington County (Nord-Carolina) Washington County (Ohio) Washington County (Oklahoma) Washington County (Oregon) Washington County (Pennsylvania) Washington County (Rhode Island) Washington County (Tennessee) Washington County (Texas) Washington County (Utah) Washington County (Virginia) Washington County (Vermont) Washington County (Wisconsin) se også: Washington Parish