Duncan kan være: Byer i USA. Duncan (Alabama), i Tallapoosa County. Duncan (Arizona), i Greenlee County. Duncan (Arkansas), i Monroe County. Duncan (Colorado), i Saguache County. Duncan (Illinois), i Stark County. Duncan (Indiana), i Floyd County. Duncan (Iowa), i Hancock County. Duncan (Kentucky), i Casey County. Duncan (Kentucky), i Mercer County. Duncan (Mississippi), i Bolivar County. Duncan (Missouri), i Webster County. Duncan (Montana), i Flathead County. Duncan (Nebraska), i Platte County. Duncan (Nord-Carolina), i Harnett County. Duncan (Oklahoma), i Stephens County.
https://no.wikipedia.org/wiki/Duncan