Airports 3,851 to 3,900
Grundy Center Municipal Airport
Fairchild Air Force Base
Marshfield Municipal Airport
Grundy County Memorial Hospital Heliport
Merrill Municipal Airport
St Mary's Hospital - Franciscan-Skemp Heliport
Greenfield Municipal Airport
McCall Municipal Airport
Houghton County Memorial Airport
MercyOne Cedar Falls Medical Center Heliport