Cities:
Clear Lake,
Dougherty,
Mason City,
Meservey,
Nora Springs,
Plymouth,
Rock Falls,
Rockwell,
Swaledale,
Thornton,
Ventura
Townships:
Bath,
Clear Lake,
Dougherty,
Falls,
Geneseo,
Grant,
Grimes,
Lake,
Lime Creek,
Lincoln,
Mason,
Mount Vernon,
Owen,
Pleasant Valley,
Portland,
Union
ZIP Codes:
50401,
50428,
50433,
50434,
50444,
50449,
50457,
50458,
50464,
50467,
50468,
50469,
50475,
50477,
50479,
50482
Unified School Districts: