508
- 50801 Creston
- 50830 Afton
- 50833 Bedford
- 50835 Benton
- 50836 Blockton
- 50837 Bridgewater
- 50839 Carbon
- 50840 Clearfield
- 50841 Corning
- 50842 Cromwell
- 50843 Cumberland
- 50845 Diagonal
- 50846 Fontanelle
- 50847 Grant
- 50848 Gravity
- 50849 Greenfield
- 50851 Lenox
- 50853 Massena
- 50854 Mount Ayr
- 50857 Nodaway
- 50858 Orient
- 50859 Prescott
- 50860 Redding
- 50861 Shannon City
- 50862 Sharpsburg
- 50863 Tingley
- 50864 Villisca