- Cabin John
- Cable
- Cabool
- Cabot
- Cadillac
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- Cahokia
- Calabasas
- Caldwell
- Caledonia
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- Calgary
- Calhan
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- California
- California City
- Calistoga
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- Calumet City
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- Calvert City
- Calverton
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- Camden
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- Camilla
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- Canandaigua
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- Cape Canaveral
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- Capitola
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- Carbon
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- Carleton
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- Carlisle
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- Carlstadt
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- Carlyle
- Carmel
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- Carmel-by-the-Sea
- Carmi
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- Carpentersville
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- Carter Lake
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- Castle Hayne
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- Castle Rock
- Castleton-on-Hudson
- Castor
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- Cataula
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- Cathedral City
- Catlett
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- Catlin
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- Catoosa
- Cave City
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- Cavendish
- Cayce
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- Cecil
- Cecilia
- Cedar
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- Cedar City
- Cedar Crest
- Cedar Falls
- Cedar Grove
- Cedar Hill
- Cedar Hills
- Cedar Lake
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- Cedar Rapids
- Cedar Springs
- Cedarburg
- Cedaredge
- Cedarhurst
- Cedartown
- Cedarville
- Celebration
- Celestine
- Celina
- Cement City
- Centennial
- Center
- Center Harbor
- Center Line
- Center Moriches
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- Centerburg
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- Centerview
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- Central
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- Chapmanville
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- Charleroi
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- Charles Town
- Charleston
- Charlestown
- Charlevoix
- Charlotte
- Charlottesville
- Charlottetown
- Charter Township of Clinton
- Chaska
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- Chatham Township
- Chatham-Kent
- Chatsworth
- Chattanooga
- Chebanse
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- Cherry Log
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- Chickamauga
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- Chillicothe
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- Chino
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- Chiozzola
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- Chrisman
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- Christiansted
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- Church Hill
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- Churubusco
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- Circleville
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- Citra
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- Claude
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- Clay Center
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- Clearwater
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- Cleveland
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- Clifton
- Clifton Heights
- Clinton
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- Clive
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- Clovis
- Clute
- Clyde
- Clyde Hill
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- Coal City
- Coalmont
- Coatesville
- Coats
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- Coburg
- Cochrane
- Cockeysville
- Cocoa
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- Coconut Creek
- Cody
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- Coffeyville
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- Cohoes
- Colbert
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- Coldspring
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- Coleman
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- College Corner
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- Collierville
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- Colon
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- Colorado Springs
- Colstrip
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- Columbia City
- Columbia Heights
- Columbia Station
- Columbiana
- Columbus
- Columbus Grove
- Columbus Junction
- Colwich
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- Commerce
- Commerce Charter Township
- Commerce City
- Commercial Point
- Commiskey
- Compton
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- Concord
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- Conrad
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- Continental
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- Conway
- Conyers
- Cook
- Cookeville
- Cool Ridge
- Coolidge
- Coomera
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- Cooper City
- Cooper Landing
- Coopersburg
- Cooperstown
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- Coos Bay
- Copiague
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- Coquille
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- Coral Gables
- Coral Springs
- Coralville
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- Corbin
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- Cornelia
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- Corning
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- Corona
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- Corpus Christi
- Corry
- Corryton
- Corsicana
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- Cortez
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- Cortlandt
- Corunna
- Corvallis
- Cory
- Corydon
- Cosby
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- Cotopaxi
- Cottage Grove
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- Coudersport
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- Country Club
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- Countryside
- Courtenay
- Courtice
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- Covert
- Covina
- Covington
- Cowarts
- Coweta
- Coxs Creek
- Cozad
- Crafton
- Craigville
- Cranberry Township
- Cranbrook
- Cranbury Township
- Crandall
- Crane
- Crane Lake
- Cranford
- Cranston
- Crawford
- Crawfordsville
- Crawfordville
- Creal Springs
- Creede
- Crescent
- Crescent City
- Crescent Springs
- Cresco
- Cresskill
- Cresson
- Crest Hill
- Crested Butte
- Crestline
- Creston
- Crestview
- Crestview Hills
- Crestwood
- Crete
- Creve Coeur
- Cridersville
- Crittenden
- Crivitz
- Crocker
- Crockett
- Crofton
- Cromwell
- Crooksville
- Crosby
- Cross Lanes
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- Crossett
- Crossfield
- Crossville
- Croswell
- Crothersville
- Crowley
- Crown Point
- Crownsville
- Crozet
- Crum Lynne
- Crystal City
- Crystal Lake
- Crystal River
- Crystal Springs
- Cuba
- Cuba City
- Cudahy
- Cuddy
- Cudjoe Key
- Cullman
- Culpeper
- Culver
- Culver City
- Cumberland
- Cumberland City
- Cumming
- Cunningham
- Cupertino
- Curryville
- Curtice
- Cushing
- Custer
- Cutchogue
- Cutler
- Cutler Bay
- Cuyahoga Falls
- Cynthiana
- Cypress