| # | Nom | Elo | Total | Pays | Classement |
| 651. | calamity_ | 1641 | 60 | Beginner | |
| 652. | calin1509 | 1904 | 32 | Beginner | |
| 653. | caloubugs | 2174 | 394 | - | |
| 654. | calvin l dixon | 1813 | 17 | - | |
| 655. | calvinchess | 1690 | 7 | - | |
| 656. | camaleoncio1 | 2138 | 144 | Strong Amateur | |
| 657. | camelloco | 1946 | 37 | Beginner | |
| 658. | cammiefields | 2625 | 5433 | Grandmaster | |
| 659. | capablanca | 1681 | 7 | - | |
| 660. | capablanca63 | 2440 | 4604 | FIDE Master | |
| 661. | capablancayverde | 2417 | 594 |
|
- |
| 662. | capaeuwekhine | 1998 | 99 |
|
- |
| 663. | capivaradf | 1789 | 10 | - | |
| 664. | captcrasto | 1794 | 98 | Amateur | |
| 665. | caracolillo | 1914 | 320 | - | |
| 666. | carafizi | 1914 | 86 | - | |
| 667. | caramell | 1745 | 11 | - | |
| 668. | carellanos | 2401 | 432 | Strong Amateur | |
| 669. | carlfahrenheid | 2401 | 121980 | Internat. Master | |
| 670. | carlos a gomes | 1949 | 106 | Amateur | |
| 671. | carlos caudillo | 2155 | 119 | Amateur | |
| 672. | carlosant | 2700 | 0 |
|
World Champion |
| 673. | carlroyle123 | 1845 | 74 | Beginner | |
| 674. | carmar92024 | 1897 | 1558 |
|
Tactics Master |
| 675. | carnivor | 2466 | 456 |
|
Amateur |
| # | Nom | Elo | Total | Pays | Classement |
| 676. | carno | 2364 | 4330 | FIDE Master | |
| 677. | carolus | 2285 | 866 | - | |
| 678. | carolyn | 2341 | 372 | - | |
| 679. | carsensito12 | 2298 | 146 | - | |
| 680. | carstenh | 2312 | 29147 |
|
FIDE Master |
| 681. | caselli | 2500 | 167637 | Internat. Master | |
| 682. | casmir | 1603 | 1 | - | |
| 683. | casperov | 2104 | 52 | Beginner | |
| 684. | cassandre-apolline | 1919 | 43 | Beginner | |
| 685. | castle | 2338 | 557 | - | |
| 686. | cateye57 | 1849 | 83 | - | |
| 687. | catros | 1942 | 68 | Beginner | |
| 688. | cavbleu | 2456 | 4361 | FIDE Master | |
| 689. | cazpivarov | 2254 | 281 | Apprentice | |
| 690. | caïssa | 2265 | 2120 |
|
Top Player |
| 691. | cb69 | 2473 | 11826 | FIDE Master | |
| 692. | cb_64matrix | 2110 | 98 | Amateur | |
| 693. | cbrabe | 2223 | 4978 | FIDE Master | |
| 694. | cchess1 | 2396 | 3945 | - | |
| 695. | ccposton | 2376 | 2481 | Top Player | |
| 696. | cdanderson_11 | 1797 | 387 | - | |
| 697. | cebulon | 2348 | 2262 | Top Player | |
| 698. | cembalo | 1690 | 25 | - | |
| 699. | cergen | 2337 | 5226 | FIDE Master | |
| 700. | cerys50 | 2318 | 189 | - |