Population
Greater Than 6000

Clear Lake (7,834)
Mason City (27,505)

Population
Between 6000 and 1000

Population
Less than 1000

Dougherty (77)
Meservey (225)
Plymouth (416)
Rock Falls (156)
Rockwell (987)
Swaledale (168)
Thornton (361)
Ventura (723)