| Rank | Board name and description | Posts | Members |
| 1 | Grass City Marijuana Growing and Smoking community | 12615795 | 478595 |
| 2 | Overgrow Forums - discontinued Marijuana growing discussion | 6016336 | 133844 |
| 3 | Behigh.org Russian psychedelic forum | 1410235 | 9957 |
| 4 | Garden's Cure Marijuana growing forums | 1380317 | 51792 |
| 5 | Yahooka - discontinued Marijuana growers & user community | 865039 | 7324 |
| 6 | Cannabis World Marijuana cultivation discussion forums | 807527 | 22812 |
| 7 | Weed Tracker Medical marijuana forums | 756683 | 83208 |