ISO 639:c

| cnw  |  |  | I/L |  |  | Chin, Ngawn |  |  |  |  |  |
| cnx  |  |  | I/H |  |  | Cornish, Middle |  |  | 中古康沃尔语 |  |  |
| coa  |  |  | I/L |  |  | Malay, Cocos Islands |  |  |  |  |  |
| cob  |  |  | I/E |  |  | Chicomuceltec |  |  |  |  |  |
| coc  |  |  | I/L |  | Kwikapa | Cocopa |  |  |  |  |  |
| cod  |  |  | I/L |  |  | Cocama-Cocamilla |  | cocama-cocamilla |  |  |  |
| coe  |  |  | I/L |  |  | Koreguaje |  |  |  |  |  |
| cof  |  |  | I/L |  |  | Colorado |  | colorado |  |  |  |
| cog  |  |  | I/L |  |  | Chong |  |  |  |  |  |
| coh  |  |  | I/L |  |  | Chonyi |  |  |  |  |  |
| coj  |  |  | I/E |  | Tipai | Cochimi |  | cochimí |  |  |  |
| cok  |  |  | I/L |  |  | Cora, Santa Teresa |  |  |  |  |  |
| col  |  |  | I/L |  |  | Columbia-Wenatchi |  |  |  |  |  |
| com  |  |  | I/L |  | nʉmʉ tekwapʉ̱ | Comanche | comanche |  | 科曼切语 |  |  |
| con  |  |  | I/L |  |  | Cofán |  | cofán |  |  |  |
| coo  |  |  | I/L |  | Saɬuɬtxʷ | Comox |  |  | 科莫克斯语 |  |  |
| cop  |  | cop | I/E |  | ⲙⲉⲧⲛ̀ⲣⲉⲙⲛ̀ⲭⲏⲙⲓ | Coptic | copte | copto | 科普特语 | коптский | Koptisch |
| coq  |  |  | I/E |  |  | Coquille | coquille |  |  |  |  |
| cor  | kw | cor | I/L | Indo-European | Kernewek | Cornish | cornique | córnico | 康沃尔语; 康瓦尔语 | корнский | Kornisch |
| cos  | co | cos | I/L | Indo-European | corsu | Corsican | corse | corso | 科西嘉语 | корсиканский | Korsisch |
| cot  |  |  | I/L |  |  | Caquinte |  |  |  |  |  |
| cou  |  |  | I/L |  |  | Wamey |  |  |  |  |  |
| cov  |  |  | I/L |  |  | Cao Miao | cao miao |  | 草苗语 |  |  |
| cow  |  |  | I/E |  |  | Cowlitz |  |  | 考利茨语 |  |  |
| cox  |  |  | I/L |  |  | Nanti |  |  |  |  |  |
| (coy)  |  |  | I/E |  |  | Coyaima |  |  |  |  |  |
| coz  |  |  | I/L |  |  | Chochotec |  | chocho |  |  |  |
| cpa  |  |  | I/L |  |  | Chinantec, Palantla |  |  |  |  |  |
| cpb  |  |  | I/L |  |  | Ashéninka, Ucayali-Yurúa |  |  |  |  |  |
| cpc  |  |  | I/L |  |  | Ajyíninka Apurucayali |  |  |  |  |  |
| cpg  |  |  | I/E |  |  | Greek (Cappadocian) |  |  | 卡帕多细亚希腊语 |  | Griechisch (?) |
| cpi  |  |  | I/L |  |  | Chinese Pidgin English |  |  |  |  |  |
| cpn  |  |  | I/L |  |  | Cherepon |  |  |  |  |  |
| cpo  |  |  | I/L |  |  | Kpeego |  |  |  |  |  |
|  |  | cpp | M/L |  |  | Portuguese-based creoles and pidgins |  |  |  |  |  |
| cps  |  |  | I/L |  |  | Capiznon |  |  |  |  |  |
| cpu  |  |  | I/L |  |  | Ashéninka, Pichis |  |  |  |  |  |
| cpx  |  |  | I/L | Chinese |  | Pu-Xian Chinese |  |  | 莆仙話 |  |  |
| cpy  |  |  | I/L |  |  | Ashéninka, South Ucayali |  |  |  |  |  |
| cqd  |  |  | I/L |  |  | Chuanqiandian Cluster Miao |  |  | 川黔滇苗话 |  |  |
| (cqu)  |  |  | I/L |  |  | Quechua, Chilean |  |  |  |  |  |
| cra  |  |  | I/L |  |  | Chara |  |  |  |  |  |
| crb  |  |  | I/E |  |  | Carib, Island |  |  |  |  |  |
| crc  |  |  | I/L |  |  | Lonwolwol |  |  |  |  |  |
| crd  |  |  | I/L |  |  | Coeur d'Alene |  |  |  |  |  |
| cre  | cr | cre | M/L | Cree | ᓀᐦᐃᔭᐤ (Nehiyāw) | Cree | cree | cree | 克里语 |  |  |
| crf  |  |  | I/E |  |  | Caramanta |  |  |  |  |  |
| crg  |  |  | I/L |  |  | Michif |  |  |  |  |  |
| crh  |  | crh | I/L |  | Къырым Татар | Crimean Tatar | tatar de Crimé | tártaro de Crimea | 克里米亚鞑靼语 | крымскотатарский | Krimtatarisch |
| cri  |  |  | I/L |  |  | Sãotomense |  |  |  |  |  |
| crj  |  |  | I/L | Cree |  | East Cree (Southern) |  |  |  |  |  |
| crk  |  |  | I/L | Cree |  | Cree (Plains) |  |  |  |  |  |
| crl  |  |  | I/L | Cree |  | East Cree (Northern) |  |  |  |  |  |
| crm  |  |  | I/L | Cree |  | Cree (Moose) |  |  |  |  |  |
| crn  |  |  | I/L |  |  | Cora, El Nayar |  |  |  |  |  |
| cro  |  |  | I/L |  |  | Crow | crow | crow | 克劳语 |  |  |
| crq  |  |  | I/L |  |  | Chorote, Iyo'wujwa |  |  |  |  |  |
| crr  |  |  | I/E |  |  | Carolina Algonquian |  |  |  |  |  |
| crs  |  |  | I/L |  |  | Seselwa Creole French |  |  |  |  |  |
| crt  |  |  | I/L |  |  | Chorote, Iyojwa'ja |  |  |  |  |  |
| (cru)  |  |  |  |  |  | Carútana |  |  |  |  |  |
| crv  |  |  | I/L |  |  | Chaura |  |  |  |  |  |
| crw  |  |  | I/L |  |  | Chrau |  |  |  |  |  |
| crx  |  |  | I/L |  | ᑕᗸᒡ | Carrier | carrier |  |  |  |  |
| cry  |  |  | I/L |  |  | Cori |  |  |  |  |  |
| crz  |  |  | I/E |  |  | Cruzeño |  |  |  |  |  |
| csa  |  |  | I/L |  |  | Chinantec, Chiltepec |  |  |  |  |  |
| csb  |  | csb | I/L |  | kaszëbsczi | Kashubian | cachoube | casubio | 卡舒比语 | кашубский | Kaschubisch |
| csc  |  |  | I/L |  |  | Catalan Sign Language |  |  | 加泰罗尼亚手语 |  | Katalonische Zeichensprache |
| csd  |  |  | I/L |  |  | Chiangmai Sign Language |  |  | 清迈手语 |  |  |
| cse  |  |  | I/L |  |  | Czech Sign Language |  |  | 捷克手语 |  | Tscechische Zeichensprache |
| csf  |  |  | I/L |  |  | Cuba Sign Language |  |  | 古巴手语 |  |  |
| csg  |  |  | I/L |  |  | Chilean Sign Language |  |  | 智利手语 |  | Chilenische Zeichensprache |
| csh  |  |  | I/L |  |  | Chin, Asho |  |  |  |  |  |
| csi  |  |  | I/E |  |  | Miwok, Coast |  | miwok costanoano |  |  |  |
| csj  |  |  | I/L |  |  | Songlai Chin |  |  |  |  |  |
| csk  |  |  | I/L |  |  | Jola-Kasa |  |  |  |  |  |
| csl  |  |  | I/L |  |  | Chinese Sign Language |  |  | 中国手语 |  | Chinesische Zeichensprache |
| csm  |  |  | I/L |  |  | Miwok, Central Sierra |  |  |  |  |  |
| csn  |  |  | I/L |  |  | Colombian Sign Language |  |  | 哥伦比亚手语 |  | Kolumbische Zeichensprache |
| cso  |  |  | I/L |  |  | Chinantec, Sochiapan |  |  |  |  |  |
| csq  |  |  | I/L |  |  | Croatia Sign Language |  |  | 克罗地亚手语 |  | Kroatische Zeichensprache |
| csr  |  |  | I/L |  |  | Costa Rican Sign Language |  |  | 哥斯达黎加手语 |  | Costa Ricanische Zeichensprache |
| css  |  |  | I/E |  |  | Ohlone (Southern) |  |  |  |  |  |
| cst  |  |  | I/L |  |  | Ohlone (Northern) |  |  |  |  |  |
| csv  |  |  | I/L |  |  | Sumtu Chin |  |  |  |  |  |
| csw  |  |  | I/L | Cree |  | Cree (Swampy) |  |  |  |  |  |
| csy  |  |  | I/L |  |  | Chin, Siyin |  |  |  |  |  |
| csz  |  |  | I/L |  |  | Coos |  | coos |  |  |  |
| cta  |  |  | I/L |  |  | Chatino, Tataltepec |  | chatino de Tataltepec |  |  |  |
| ctc  |  |  | I/E |  |  | Chetco |  |  |  |  |  |
| ctd  |  |  | I/L |  |  | Chin, Tedim |  |  |  |  |  |
| cte  |  |  | I/L |  |  | Chinantec, Tepinapa |  |  |  |  |  |
| ctg  |  |  | I/L |  |  | Chittagonian |  |  | 吉大港语 |  |  |
| cth  |  |  | I/L |  |  | Thaiphum Chin |  |  |  |  |  |
| (cti)  |  |  | I/L |  |  | Chol, Tila |  |  |  |  |  |
| ctl  |  |  | I/L |  |  | Chinantec, Tlacoatzintepec |  |  |  |  |  |
| ctm  |  |  | I/E |  |  | Chitimacha | chitimacha |  |  |  |  |
| ctn  |  |  | I/L |  |  | Chhintange |  |  |  |  |  |
| cto  |  |  | I/L |  |  | Emberá-Catío |  |  |  |  |  |
| ctp  |  |  | I/L |  |  | Chatino, Western Highland |  | chatino de la zona alta occidental |  |  |  |
| cts  |  |  | I/L |  |  | Bicolano, Northern Catanduanes |  |  |  |  |  |
| ctt  |  |  | I/L |  |  | Wayanad Chetti |  |  |  |  |  |
| ctu  |  |  | I/L |  |  | Chol, Tumbalá |  |  |  |  |  |
| ctz  |  |  | I/L |  |  | Chatino, Zacatepec |  | chatino de Zacatepec |  |  |  |
| cua  |  |  | I/L |  |  | Cua |  |  |  |  |  |
| cub  |  |  | I/L |  |  | Cubeo |  | cubeo |  |  |  |
| cuc  |  |  | I/L |  |  | Chinantec, Usila |  |  |  |  |  |
| cug  |  |  | I/L |  |  | Cung |  |  |  |  |  |
| cuh  |  |  | I/L |  |  | Chuka |  |  |  |  |  |
| cui  |  |  | I/L |  |  | Cuiba |  | cuiba |  |  |  |
| cuj  |  |  | I/L |  |  | Mashco Piro |  |  |  |  |  |
| cuk  |  |  | I/L |  |  | Kuna, San Blas |  |  |  |  |  |
| cul  |  |  | I/L |  |  | Culina |  |  |  |  |  |
| (cum)  |  |  |  | spurious language |  | Cumeral |  |  |  |  |  |
| (cun)  |  |  | I/L |  |  | Quiché, Cunén |  |  |  |  |  |
| cuo  |  |  | I/E |  |  | Cumanagoto |  | cumanagoto |  |  |  |
| cup  |  |  | I/E |  | Kuupangaxwichem | Cupeño | cupeno | cupeño |  |  |  |
| cuq  |  |  | I/L |  |  | Cun |  |  | 村语 |  |  |
| cur  |  |  | I/L |  |  | Chhulung |  |  |  |  |  |
| cut  |  |  | I/L |  |  | Cuicatec, Teutila |  |  |  |  |  |
| cuu  |  |  | I/L |  |  | Tai Ya |  |  | 傣雅语 |  |  |
| cuv  |  |  | I/L |  |  | Cuvok |  |  |  |  |  |
| cuw  |  |  | I/L |  |  | Chukwa |  |  |  |  |  |
| cux  |  |  | I/L |  |  | Cuicatec, Tepeuxila |  |  |  |  |  |
| cuy  |  |  | I/L | isolate |  | Cuitlatec |  |  |  |  |  |
| cvg  |  |  | I/L |  |  | Chug |  |  |  |  |  |
| cvn  |  |  | I/L |  |  | Chinantec, Valle Nacional |  |  |  |  |  |
| cwa  |  |  | I/L |  |  | Kabwa |  |  |  |  |  |
| cwb  |  |  | I/L |  |  | Maindo |  |  |  |  |  |
| cwd  |  |  | I/L | Cree |  | Cree (Woods) |  |  |  |  |  |
| cwe  |  |  | I/L |  |  | Kwere |  |  |  |  |  |
| cwg  |  |  | I/L |  |  | Chewong |  |  |  |  |  |
| cwt  |  |  | I/L |  |  | Kuwaataay |  |  |  |  |  |
| cya  |  |  | I/L |  |  | Chatino, Nopala |  | chatino de Nopala |  |  |  |
| cyb  |  |  | I/E |  |  | Cayubaba |  |  |  |  |  |
| cym  | cy | wel | I/L | Indo-European | Cymraeg | Welsh | gallois | galés | 威尔士语; 威尔斯语 | валлийский | Walisisch |
| cyo  |  |  | I/L |  |  | Cuyonon |  |  |  |  |  |
| czh  |  |  | I/L | Chinese | 徽州话 | Huizhou Chinese |  |  | 徽語 |  | chinesisch (Huizhou) |
| czk  |  |  | I/E |  |  | Knaanic |  |  | 迦南语; 犹太-斯拉夫语 |  |  |
| czn  |  |  | I/L |  |  | Chatino, Zenzontepec |  | chatino de Zenzontepec |  |  |  |
| czo  |  |  | I/L | Chinese |  | Min Zhong Chinese |  |  | 閩中話 |  | chinesisch (Min Zhong) |
| czt  |  |  | I/L |  |  | Chin, Zotung |  |  |  |  |  |