what county is calamus ia in
Calamus, Iowa. Homefacts City Report. Calamus is located in Clinton County, IA. The population is 389, making Calamus the 9th largest city in Clinton County. There are 1 public schools in Calamus with an average Homefacts rating of A. The total crime rate for Calamus is low, and there are 3 registered sex offenders residing in the city.