What are the Hiawatha, Kansas Zip Codes for 2020, 2019Primary Zip Codes for HiawathaZip CodePrimary CitySecondary City66434HiawathaHiawatha, Hamlin, Reserve, WillisCities sharing Zip Codes with HiawathaZip CodePrimary CitySecondary CityMore Information66434HiawathaReserve66434HiawathaWillis66434HiawathaHamlinAdvertisements