Duncan is located in Hancock County, IA. The population is 104, making Duncan the 10th largest city in Hancock County.
There are 0 public schools in Duncan with an average Homefacts rating of NA. The total crime rate for Duncan is very low , and there are 0 registered sex offenders residing in the city. Unemployment in Duncan is low and the median home sales price is $0. Detailed and up-to-date Duncan property reports are available for any property address.
Cities near Duncan include Garfield Township, Britt Township and Liberty Township.