rumänische Ortsnamen
| Clapa |
| Clit |
| Cloasterf |
| Clopotiva |
| Cluj Manastur |
| Cluj-Napoca |
| Coaja |
| Coasta (bei Dej) |
| Coasta (bei Bistrita) |
| Coasta Hentii |
| Coasta Viscului |
| Cobatesti |
| Cobles |
| Cobor |
| Cocesti |
| Cociu |
| Codlea |
| Codor |
| Cojocani |
| Cojocna |
| Coleseni |
| Colibi |
| Colibita |
| Colonia Getita |
| Colonia Talmaciu |
| Coltesti |
| Colun |
| Cana de Jos |
| Comana de Sus |
| Comandau |
| Comanesti |
| Comiat |
| Comlod |
| Comolau |
| Comori |
| Comsesti |
| Copacel |
| Copaceni |
| Copand |
| Coplean |
| Copru |
| Copsa Mare |
| Copsa Mica |
| Corbesti |
| Corbi |
| Corbu |
| Cordos |
| Cormaia |
| Cormenis |
| Corna |
| Cornatel |
| Corneni |
| Cornesti (bei Dej) |
| Cornesti (bei Turda) |
| Cornesti (bei Cluj-Napoca) |
| Cornesti (bei Tirgu Mures) |
| Cornesti (bei Tirnaveni) |
| Cornu |
| Coroesti |
| Coroi |
| Coroieni |
| Coroisinmartin |
| Cortesti |
| Corunca |
| Corund |
| Corusu |
| Corvinesti |
| Cosbuc |
| Coseni |
| Cosesti |
| Coslariu |
| Costeni (bei Tirgu Lapus) |
| Costeni (bei Cimpeni) |
| Cotormani |
| Covacipeter |
| Covasna |
| Coves |
| Covragiu |
| Cozia |
| Cozma |
| Cozmeni |
| Craciunel (bei Blaj) |
| Craciunel (bei Odorheiu Sec.) |
| Craciunelu de Sus |
| Craciunesti (bei Brad) |
| Craciunesti (bei Tirgu Mures) |
| Craguis |
| Craiesti (bei Tirnaveni) |
| Craiesti (beiTirgu Mures) |
| Craiesti (bei Turda) |
| Crainimat |
| Crairit |
| Craiva |
| Crasna |
| Cremenea (bei Intorsura Buzaului) |
| Cremenea (bei Dej) |
| Cretesti |
| Cricau |
| Crihalma |
| Cris (bei Brad) |
| Cris (bei Sighisoara) |
| Crisan |
| Criscior |
| Criseni (bei Sovata) |
| Criseni (bei Ludus) |
| Cristesti (bei Alba Iulia) |
| Cristesti (bei Tirgu Mures) |
| Cristestii Ciceului |
| Cristian (bei Sibiu) |
| Cristian (bei Brasov) |
| Cristolt |
| Cristoltel |
| Cristorel |
| Cristur |
| Cristur-Sieu |
| Cristuru Secuiesc |
| Crit |
| Criva |
| Crivadia |
| Crizbav |
| Cubleu |
| Cublesu Somesan |
| Cucerdea |
| Cuci |
| Cuciulata |
| Cucuis |
| Cucuta |
| Cufoaia |
| Cugir |
| Cuies |
| Cuiesd |
| Culdau |
| Culpiu |
| Cund |
| Cunta |
| Cupseni |
| Curciu |
| Curechiu |
| Curpeni |
| Curpenii Silvasului |
| Curteni |
| Curtuiusu Dejului |
| Cusma |
| Cusmed |
| Custelnic |
| Cut |
| Cutca |
| Cutis |
| Cutus |
| Cuzaplac |
| Cuzdrioara |
- |
deutsche Ortsnamen
| - |
| Klitz |
| Klosdorf |
| Glockendorf |
| Abtsdorf |
| Klausenburg |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Kiwern |
| - |
| Kosch |
| Zeiden |
| - |
| - |
| Salzgrub |
| - |
| - |
| Kolibitza |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Großkopisch |
| Klein-Kopisch |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Harbachdorf |
| - |
| - |
| - |
| - |
| - |
| Zeunen |
| - |
| - |
| Kruden |
| - |
| Martinsdorf |
| - |
| - |
| - |
| - |
| Nieder-Neudorf |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Käbisch |
| - |
| - |
| - |
| - |
| Kratschendorf |
| Krötschendorf |
| Krotschendorf |
| - |
| - |
| - |
| - |
| - |
| - |
| Baiersdorf |
| - |
| Königsbach |
| - |
| - |
| - |
| - |
| Krakau |
| Königsberg |
| - |
| Kreisch |
| - |
| - |
| - |
| - |
| - |
| - |
| Nieder-Kreuz |
| Großau |
| Neustadt |
| - |
| - |
| - |
| - |
| Kreuz |
| Szeklerkreuz |
| Deutsch-Kreuz |
| - |
| - |
| Krebsbach |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Kudschir |
| Kulyes |
| - |
| Goldau |
| - |
| Reußdorf |
| Zekeschdorf |
| - |
| Kirtsch |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| - |
| Kockt |
| - |
| - |
| - |
| - |
| - |
|
ungarische Ortsnamen
| - |
| Klic |
| Miklostelke |
| - |
| Kolozsmonostor |
| Kolozsvar |
| - |
| Gyulatelke |
| Sajokiskeresztur |
| - |
| - |
| Kobatfalva |
| - |
| Kobor |
| - |
| Szamoskocs |
| Feketehalom |
| Kodor |
| Mogoskozsokany |
| Kolozs |
| - |
| Szekas |
| Kolibica |
| - |
| - |
| Torockoszentgyörgy |
| Kellen |
| - |
| - |
| Kommando |
| Homorodkemenyfalva |
| Komjadpataka |
| Komlod |
| Komollo |
| Kincsasfö |
| Komjatszeg |
| - |
| Koppand |
| Maroskoppand |
| Kaplyon |
| Kapor |
| Nagykapus |
| Kiskapus |
| Szekelycsoka |
| Korb |
| Gyergyohollo |
| Kardos |
| - |
| Ködmönös |
| Szavaspatak |
| Hortobagyfalva |
| Szükerek |
| Magyarszarvaskend |
| Sinfalva |
| Solyomtelke |
| Somosd |
| Sövenyfalva |
| - |
| Kreßten |
| Korod |
| Karulyfalva |
| Korodszentmarton |
| - |
| Koronka |
| Korond |
| Nadaskorod |
| Szaszujfalu |
| Hordo |
| Szotor |
| - |
| Koslard |
| - |
| - |
| Kotormany |
| - |
| Kovaszna |
| Kövesd |
| - |
| - |
| Kozmatelke |
| Csikkozmas |
| Alsokaracsonyfalva |
| Karacsonyfalva |
| Felsökaracsonyfalva |
| Karacsonfalva |
| Nyaradkaracsonyfalva |
| Karagisen |
| Kiralyfalva |
| Mezökiralyfalva |
| Pusztaszentkiraly |
| Kiralynemeti |
| Kiralyret |
| Kiralypatak |
| - |
| - |
| Kemenye |
| - |
| Boroskrakko |
| Kiralyhalma |
| - |
| Keresd |
| Tehenfalva |
| Kristyor |
| Körispatak |
| Tothaza |
| - |
| Maroskeresztur |
| Csicsokeresztur |
| Keresztenysziget |
| Keresztenyfalva |
| Nagykeresztes |
| Kiskeresztes |
| Ördögkeresztur |
| Csernakeresztur |
| Betlenkeresztur |
| Szekelykeresztur |
| Szaszkeresztur |
| Krivapuszta |
| - |
| Krizba |
| Almasköblös |
| Magyarköblos |
| Romankocsard |
| Kutyfalu |
| - |
| - |
| - |
| Kohopataka |
| Kudzir |
| Kulyes |
| Szekelykövesd |
| Varkudu |
| Mezökölpeny |
| Kund |
| Konca |
| Kupsafalva |
| Körös |
| - |
| Kürpeny |
| Silvasului |
| Udvarfalva |
| Alsokörtvelyes |
| Kusma |
| Küsmöd |
| Csüdetelke |
| Kutfalva |
| Kötke |
| Kiskökenyes |
| Kutas |
| Közeplak |
| Közarvar |
|
