| 21451 | Clarence Seedorf | 16,183 | 5 | 381 |
| 21452 | Clarissa Ward | 23,838 | 5 | 304 |
| 21453 | Claudia Goldin | 123,196 | 5 | 35 |
| 21454 | Clerk of the United States House of Representatives | 17,824 | 5 | 381 |
| 21455 | Clint Black | 42,153 | 5 | 100 |
| 21456 | Cloud computing | 18,054 | 5 | 375 |
| 21457 | Cloud seeding in the United Arab Emirates | 57,680 | 5 | 47 |
| 21458 | Cody Longo | 25,111 | 5 | 290 |
| 21459 | Cody Martin (basketball) | 77,399 | 5 | 36 |
| 21460 | Coimbatore Lok Sabha constituency | 28,262 | 5 | 156 |
| 21461 | Cole Beasley | 70,704 | 5 | 75 |
| 21462 | Coleman Wong | 25,593 | 5 | 223 |
| 21463 | Colorectal cancer | 18,767 | 5 | 263 |
| 21464 | Colt Brennan | 15,618 | 5 | 330 |
| 21465 | Colugo | 58,718 | 5 | 61 |
| 21466 | Com | 39,316 | 5 | 117 |
| 21467 | Comedy Central Roast | 20,572 | 5 | 304 |
| 21468 | Communist Party of Nepal (Unified Marxist–Leninist) | 45,973 | 5 | 77 |
| 21469 | Complaint tablet to Ea-nasir | 19,999 | 5 | 276 |
| 21470 | Conchita Wurst | 44,323 | 5 | 99 |
| 21471 | Conjoined twins | 26,530 | 5 | 203 |
| 21472 | Conjuring Kannappan | 26,774 | 5 | 213 |
| 21473 | Connie Booth | 54,916 | 5 | 56 |
| 21474 | Constitution Day (India) | 79,269 | 5 | 26 |
| 21475 | Convergence (The Last of Us) | 52,260 | 5 | 56 |
| 21476 | Cop Universe | 15,871 | 5 | 410 |
| 21477 | Coronation of Elizabeth II | 89,502 | 5 | 56 |
| 21478 | Cory Michael Smith | 20,257 | 5 | 303 |
| 21479 | CoryxKenshin | 14,767 | 5 | 570 |
| 21480 | Costao | 20,882 | 5 | 223 |
| 21481 | Cotton Bowl Classic | 42,483 | 5 | 105 |
| 21482 | Cousins (Kanye West song) | 13,667 | 5 | 497 |
| 21483 | Cox–Zucker machine | 114,368 | 5 | 22 |
| 21484 | Craig Counsell | 61,093 | 5 | 47 |
| 21485 | Craig Jones (grappler) | 15,272 | 5 | 473 |
| 21486 | Crazy Train | 27,795 | 5 | 166 |
| 21487 | Creed (band) | 14,006 | 5 | 453 |
| 21488 | Cricket World Cup hosts | 59,963 | 5 | 106 |
| 21489 | Criminal Minds | 10,507 | 5 | 829 |
| 21490 | Criminal Record (TV series) | 13,718 | 5 | 616 |
| 21491 | Crispin Glover | 35,223 | 5 | 144 |
| 21492 | Croatia and the euro | 29,112 | 5 | 213 |
| 21493 | Crocus City Hall | 106,066 | 5 | 34 |
| 21494 | Crossroads (2002 film) | 17,423 | 5 | 528 |
| 21495 | Crown Jewels of the United Kingdom | 72,571 | 5 | 77 |
| 21496 | Crown Prince Reza | 16,515 | 5 | 364 |
| 21497 | Crunchyroll | 76,190 | 5 | 29 |
| 21498 | Crusades | 13,717 | 5 | 686 |
| 21499 | Cus D'Amato | 44,627 | 5 | 129 |
| 21500 | Cushing's syndrome | 37,143 | 5 | 97 |