| Code | Name | Region |
|---|---|---|
| DECBG | Cornberg | |
| DECOA | Cosa | ST |
| DECUO | Coschen/neissemunde | BB |
| DECOY | Cositz | ST |
| DECBD | Cossebaude | SN |
| DECOJ | Cossengrun/vogtlandisches Oberland | TH |
| DECWG | Coswig | SN |
| DECSW | Coswig | ST |
| DECOT | Cottbus | BB |
| DECTD | Cottendorf/ilmtal | TH |
| DECRH | Crailsheim | BW |
| DECRM | Cramberg | RP |
| DECRA | Cramme | NI |
| DECZE | Clenze | NI |
| DECGE | Clingen | TH |
| DECLO | Cloppenburg | NI |
| DECBB | Cobbel | ST |
| DECSF | Cobbelsdorf | ST |
| DECOB | Coburg | BY |
| DECOC | Cochem | RP |
| DECSO | Cochstedt | ST |
| DECOH | Coerheide | NW |
| DECOF | Coesfeld | NW |
| DECBE | Colbe | HE |
| DECQO | Colbitz | ST |
| DECOZ | Colditz | SN |
| DECOM | Collmen | SN |
| DECGM | Colmberg | BY |
| DECLM | Colmnitz | SN |
| DECMF | Colmnitz Bei Freital | SN |
| DECLR | Colnrade | NI |
| DECLP | Colpin | MV |
| DECMG | Chieming | BY |
| DECHI | Chiemsee | BY |
| DECOU | Chorau | ST |
| DECRN | Choren | SN |
| DECOI | Chorin | BB |
| DEA27 | Christanz | BY |
| DECRF | Christdorf | BB |
| DECST | Christes | TH |
| DECSH | Christiansholm | SH |
| DECSR | Christinendorf | BB |
| DECFK | Christinenfeld Bei Klutz | MV |
| DECTH | Christinenthal/holstein | SH |
| DECUD | Chursdorf Bei Schleiz | TH |
| DECUF | Chursdorf/penig | SN |
| DECHZ | Clarholz | NW |
| DECUS | Clausdorf/satow | MV |
| DEZCN | Clausen | RP |
| DECNZ | Claussnitz | SN |