526
- 52601 Burlington
- 52619 Argyle
- 52620 Bonaparte
- 52621 Crawfordsville
- 52623 Danville
- 52624 Denmark
- 52625 Donnellson
- 52626 Farmington
- 52627 Fort Madison
- 52630 Hillsboro
- 52632 Keokuk
- 52635 Lockridge
- 52637 Mediapolis
- 52638 Middletown
- 52639 Montrose
- 52640 Morning Sun
- 52641 Mount Pleasant
- 52644 Mount Union
- 52645 New London
- 52646 Oakville
- 52647 Olds
- 52649 Salem
- 52650 Sperry
- 52651 Stockport
- 52653 Wapello
- 52654 Wayland
- 52655 West Burlington
- 52656 West Point
- 52657 Saint Paul
- 52658 Wever
- 52659 Winfield
- 52660 Yarmouth