| Code | Name | Region |
|---|---|---|
| DECUL | Clausthal | NI |
| DECLV | Cleebronn | BW |
| DECLF | Carlsfeld | SN |
| DECMZ | Carmzow-wallmow | BB |
| DECFW | Carolinenhof Bei Waren | MV |
| DECAR | Carolinensiel | NI |
| DECRP | Carpin | MV |
| DECRG | Carzig/fichtenhohe | BB |
| DECKC | Casekirchen/molauer Land | ST |
| DECOW | Casekow | BB |
| DECSL | Casel/drebkau | BB |
| DECYN | Castell | BY |
| DECRL | Castrop-rauxel | NW |
| DECSD | Cattenstedt | ST |
| DECEF | Catterfeld | TH |
| DECVR | Cavertitz | SN |
| DECEL | Celle | NI |
| DECHA | Cham | BY |
| DECMA | Chamerau | BY |
| DECTB | Charlottenberg | RP |
| DECOQ | Charlottenthal Bei Krakow Am See | MV |
| DECHE | Chemnitz | SN |
| DECAN | Calden | HE |
| DELLB | Callbach | RP |
| DECGH | Callenberg Bei Hohenstein-ernstthal | SN |
| DECVS | Calveslage | NI |
| DECVO | Calvorde | ST |
| DECAL | Calw | BW |
| DECMS | Cambs | MV |
| DECGS | Camburg | TH |
| DECAI | Camin | MV |
| DECMH | Caminchen/neu Zauche | BB |
| DECMP | Cammer | BB |
| DECMN | Cammin Bei Neubrandenburg | MV |
| DECMR | Cammin Bei Rostock | MV |
| DECPO | Campow | MV |
| DECPL | Capelle | NW |
| DECPV | Cappel Bei Bremerhaven | NI |
| DECAP | Cappeln | NI |
| DECPU | Caputh/schwielowsee | BB |
| DECLW | Carlow | MV |
| DEZCG | Carlsberg | RP |
| DEBJZ | Butzen | BB |
| DEUZR | Butzer | BB |
| DEBUZ | Butzfleth | NI |
| DEBJO | Butzow | BB |
| DEBZO | Butzow | MV |
| DEBKJ | Butzow Bei Anklam | MV |
| DEBQX | Buxheim | BY |
| DEBXE | Buxheim, Unterallgau | BY |