| labrats | A hangout for lab nerds! | 662,509 |
| statistics | statistics | 592,553 |
| linguistics | Linguistics | 354,776 |
| ufo | UFO | 354,463 |
| StrangeEarth | StrangeEarth | 346,995 |
| Dinosaurs | Dinosaurs: They Rock! | 313,880 |
| spaceflight | Spaceflight news and discussion | 290,906 |
| submarines | Run Silent, Run Deep | 276,508 |
| animalid | Animal Identification | 274,534 |
| Cryptozoology | Cryptozoology | 262,981 |
| energy | /r/Energy: News & Discussion | 233,563 |
| geology | Geology! Before the World. | 232,784 |
| SampleSize | /r/SampleSize: Where your opinions actually matter! | 231,447 |
| Jung | Carl Jung and Jungian Psychology, Theory, and Philosophy | 230,712 |
| Archaeology | Archaeology | 228,935 |
