C
- Cairo
- Calamus
- Caldwells
- Calhoun
- California Junction
- Callender
- Calmar
- Calumet
- Camanche
- Cambria
- Cambridge
- Cameron
- Cameron
- Camp Dodge
- Canby
- Canfield
- Canton
- Cantril
- Carbon
- Carl
- Carlisle
- Carlton Mobile Home
- Carmel
- Carnarvon
- Carnes
- Carney
- Carney
- Carnforth
- Carpenter
- Carriage Place
- Carroll
- Carrolton
- Carrville
- Carson
- Cartersville
- Cascade
- Casey
- Casino Beach
- Cass
- Cassville
- Castalia
- Castana
- Cattese
- Cedar
- Cedar Bluff
- Cedar Falls
- Cedar Falls Junction
- Cedar Hills
- Cedar Rapids
- Cedar Valley
- Centerdale
- Center Junction
- Center Point
- Centerville
- Centerville
- Central City
- Central Heights
- Centralia
- Chapin
- Chariton
- Charles City
- Charleston
- Charlotte
- Charter Oak
- Chatauqua
- Chatsworth
- Chelsea
- Cheney
- Chequest
- Cherokee
- Chester
- Chickasaw
- Chillicothe
- Church
- Churchville
- Churdan
- Cincinnati
- Clara
- Clare
- Clarence
- Clarinda
- Clarion
- Clark
- Clarkdale
- Clarksville
- Clay
- Clay Mills
- Clayton
- Clayton Center
- Clearfield
- Clear Lake
- Cleghorn
- Clemons
- Clermont
- Cleves
- Cliffland
- Climax
- Climbing Hill
- Clinton
- Clinton Stock Yards
- Clio
- Clive
- Cloud
- Cloverdale
- Clucas
- Clutier
- Clyde
- Coal City
- Coal Creek
- Coal Valley
- Coalville
- Coatsville
- Coburg
- Coggon
- Coin
- Colesburg
- Colfax
- College Springs
- Collet
- Collins
- Colo
- Columbia
- Columbus City
- Columbus Jct
- Columbus Junction
- Colwell
- Commerce
- Communia
- Competine
- Conesville
- Confidence
- Congers Mobile Home
- Conover
- Conrad
- Conroy
- Consol
- Conway
- Cool
- Coon Rapids
- Cooper
- Coppock
- Coral Trailer Park
- Coralville
- Corley
- Cornelia
- Cornell
- Corning
- Correctionville
- Corwith
- Corydon
- Cosgrove
- Coster
- Cottage Hill
- Cotter
- Cottonville
- Cou Falls
- Coulter
- Council Bluffs
- Country Aire Mobile
- Country Villa Mobile Home Park
- Covington
- Crab Town
- Craig
- Cranston
- Crathorne
- Crawfordsville
- Creamery
- Crescent
- Cresco
- Cresent
- Creston
- Creswell
- Cricket
- Crisp
- Crocker
- Cromwell
- Croton
- Crystal Lake
- Cumberland
- Cumming
- Curlew
- Cushing
- Cylinder