| City Name | County | Zip Code |
| Cabin John | Montgomery | 20818 |
| California | Saint Mary's | 20619 |
| Callaway | Saint Mary's | 20620 |
| Calvert | Cecil | 21911 |
| Calverton | Prince George's | ***** |
| Cambridge | Dorchester | 21613 |
| Camp Springs | St Mary's | ***** |
| Canton | Baltimore | 21224 |
| Cape Loch Haven | Anne Arundel | 21037 |
| Cape Saint Claire | Anne Arundel | 21401 |
| Capital Heights | Prince George's | ***** |
| Cardiff | Harford | 21024 |
| Carney | Baltimore | 21234 |
| Carrollton | Carroll | 21157 |
| Carrolltowne | Carroll | 21784 |
| Carsins | Harford | 21001 |
| Cascade | Frederick | 21719 |
| Casselman | Garrett | 21536 |
| Castelton | Harford | 21034 |
| Catoctin | Frederick | 2 |
| Catonsville | Baltimore | 21228 |
| Cavetown | Washington | 21720 |
| Cayots Corner | Cecil | 21915 |
| Cecilton | Cecil | 21913 |
| Cedar Beach | Baltimore | 21221 |
| Centreville | Queen Anne's | 21617 |
| Chance | Somerset | ***** |
| Chaptico | Saint Mary's | 20621 |
| Charlestown | Cecil | 21914 |
| Charlotte Hall | Saint Mary's | 20622 |
| Chase | Baltimore | 21027 |
| Chelsea Beach | Anne Arundel | 21122 |
| Cheltenham | Prince George's | 20623 |
| Cherry Hill | Anne Arundel | 21225 |
| Chesapeake Beach | Calvert | 20732 |
| Chesapeake City | Cecil | 21915 |
| Chester | Queen Anne's | 21619 |
| Chestertown | Kent | 21620 |
| Chestnut Grove | Washington | 21756 |
| Cheverly | Prince George's | ***** |
| Chevy Chase | Montgomery | ***** |
| Chewsville | Washington | 21721 |
| Childs | Cecil | 21916 |
| Chillum | Prince George's | ***** |
| Church Creek | Dorchester | 21622 |
| Church Hill | Queen Anne's | ***** |
| Churchton | Anne Arundel | 20733 |
| Churchville | Harford | 21028 |
| Clairborne | Talbot | 21624 |
| Clarksburg | Montgomery | ***** |
| Clarksville | Allegany | 21532 |
| Clarksville | Howard | 21029 |
| Clear Spring | Washington | 21722 |
| Clements | Saint Mary's | 20624 |
| Clinton | Prince George's | ***** |
| Cobb Island | Charles | 20625 |
| Coctopsville | Baltimore | ***** |
| Coctopsville Hunt Valley | Baltimore | ***** |
| Colesville | Montgomery | ***** |
| College Park | Prince George's | ***** |
| Colora | Cecil | 21917 |
| Coltons Point | Saint Mary's | 20626 |
| Columbia | Howard | ***** |
| Compton | Saint Mary's | 20627 |
| Comus | Montgomery | 20842 |
| Conowingo | Cecil | 21918 |
| Cooksville | Howard | 21723 |
| Coopstown | Harford | 21050 |
| Copperville | Carroll | 21787 |
| Cordova | Talbot | 21625 |
| Corriganville | Allegany | 21524 |
| Cottage City | Prince George's | 20722 |
| Cowentown | Cecil | 21921 |
| Coxs Corner | Wicomico | 21865 |
| Carpo | Dorchester | 21626 |
| Creagerstown | Frederick | 21788 |
| Crellin | Garrett | 21550 |
| Cresaptown | Allegany | 21505 |
| Crisfield | Somerset | 21817 |
| Crocheron | Dorchester | 21627 |
| Crofton | Anne Arundel | 21114 |
| Croom | Prince George's | ***** |
| Crownsville | Anne Arundel | 21032 |
| Crumpton | Queen Anne's | 21628 |
| Cumberland | Allegany | ***** |
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