527
- 52701 Andover
- 52720 Atalissa
- 52721 Bennett
- 52722 Bettendorf
- 52726 Blue Grass
- 52727 Bryant
- 52728 Buffalo
- 52729 Calamus
- 52730 Camanche
- 52731 Charlotte
- 52732 Clinton
- 52737 Columbus City
- 52738 Columbus Junction
- 52739 Conesville
- 52742 De Witt
- 52745 Dixon
- 52746 Donahue
- 52747 Durant
- 52748 Eldridge
- 52749 Fruitland
- 52750 Goose Lake
- 52751 Grand Mound
- 52752 Grandview
- 52753 Le Claire
- 52754 Letts
- 52755 Lone Tree
- 52756 Long Grove
- 52757 Low Moor
- 52758 Mc Causland
- 52760 Moscow
- 52761 Muscatine
- 52765 New Liberty
- 52766 Nichols
- 52767 Pleasant Valley
- 52768 Princeton
- 52769 Stockton
- 52772 Tipton
- 52773 Walcott
- 52774 Welton
- 52776 West Liberty
- 52777 Wheatland
- 52778 Wilton