505
- 50501 Fort Dodge
- 50510 Albert City
- 50511 Algona
- 50514 Armstrong
- 50515 Ayrshire
- 50516 Badger
- 50517 Bancroft
- 50518 Barnum
- 50519 Bode
- 50520 Bradgate
- 50521 Burnside
- 50522 Burt
- 50523 Callender
- 50524 Clare
- 50525 Clarion
- 50527 Curlew
- 50528 Cylinder
- 50529 Dakota City
- 50530 Dayton
- 50531 Dolliver
- 50532 Duncombe
- 50533 Eagle Grove
- 50535 Early
- 50536 Emmetsburg
- 50538 Farnhamville
- 50539 Fenton
- 50540 Fonda
- 50541 Gilmore City
- 50542 Goldfield
- 50543 Gowrie
- 50544 Harcourt
- 50545 Hardy
- 50546 Havelock
- 50548 Humboldt
- 50551 Jolley
- 50554 Laurens
- 50556 Ledyard
- 50557 Lehigh
- 50558 Livermore
- 50559 Lone Rock
- 50560 Lu Verne
- 50561 Lytton
- 50562 Mallard
- 50563 Manson
- 50565 Marathon
- 50566 Moorland
- 50567 Nemaha
- 50568 Newell
- 50569 Otho
- 50570 Ottosen
- 50571 Palmer
- 50573 Plover
- 50574 Pocahontas
- 50575 Pomeroy
- 50576 Rembrandt
- 50577 Renwick
- 50578 Ringsted
- 50579 Rockwell City
- 50581 Rolfe
- 50582 Rutland
- 50583 Sac City
- 50585 Sioux Rapids
- 50586 Somers
- 50588 Storm Lake
- 50590 Swea City
- 50591 Thor
- 50593 Varina
- 50594 Vincent
- 50595 Webster City
- 50597 West Bend
- 50598 Whittemore
- 50599 Woolstock