Dens generally cost between 2,000-7,500 Gems or 5-7 Diamonds. There are two underwater dens, the "Sunken Ship" den, and the "Lost Ruins" den. Dens are available in the Den Shop in Coral Canyons, while the underwater dens are available in Deep Blue; these can also be accessed by the Jammer, simply clicking the "Switch Den" icon when editing their Den.
The maximum number of items in one Den is 300 items for Members and 100 items for Non-Members. Members can have up to 16 Dens. You cannot delete the original "Small House" den, because its the only den available to Non-Members. It is impossible for a Jammer to have no den. Most dens have seasonal themes, such as the Gingerbread House and the Haunted House. Jammers are able to decorate their dens any way that they would like. Some dens are from the Diamond Shop, such as the Crystal Palace. These dens cost around 7 Diamonds each, and some of them are known for being the biggest dens. The Greely's Hideout Den and the Sky Kingdom Den are some of the bigger dens that cost 7 Diamonds , although, there was another bigger den only available in the Beta Testing.
- Small House
- Ol' Barn
- Enchanted Hollow
- Fantasy Castle
- Princess Castle
- Tree House
- Sunken Ship (water Den)
- Lost Ruins (Water Den)
- Water Park (Summer Only)
- Mushroom Hut (Summer Only)
- Snow Fort (Winter Only)
- Crystal Palace
- Sol Arcade Den
- Cosmo's Den
- Sky Kingdom
- Greely's Hideout
- Beach House
- Haunted House (formerly Night of the Phantoms)
- Epic Haunted Manor (Night of the Phantoms only)
- Gingerbread House (Jamaalidays Only)
- Bounce House Den
- Winter Palace (Winter Only)
- Friendship Cottage (Friendship Festival Only)
- Lucky Castle (Lucky Day Only)
- Spring Cottage (spring only)
- Peck's Den
- Pixel Place
- The Fantasy Castle is the most expensive den for gems, costing 7,500 Gems.
- If you had purchased a King of the Jungle Membership Card, you had the option to choose a free Castle Den or a National Geographic Kids Magazine Subscription.
- The Castle Den is used as the layout for the Trading Party, except with snow and a frozen moat, instead of the regular grass.
- While in "Preview Mode", you can't chat, use any actions or see other players. Yet you are able to type :dance:, :hop: (even though you won't get a little chat bar on the bottom) and you will dance, hop etc. This glitch isn't patched.
- The newest den is the Peck's Den, which is available in the Diamond Shop for 7 Diamonds.
- There used to be a den for Jammers during the Beta Stage, which included 3 floors, but it was soon removed after the Beta Stage was over. It was thought that the den was the Small House den, but in the Beta Stage. (You are able to see what it looked like at the Beta Party, as this party features that den).
- There are miniature versions of "real" dens available for pets, such as the Pet Fantasy Castle Den, the Pet Castle Den, the Pet Haunted House Den, and the Pet Princess den.
- Dens can be reached by clicking the house icon on the World Map.
- Currently, the biggest den is The Sky Kingdom.
- The Diamond Shop dens are actually the most expensive dens, if you convert the cost of the diamonds into gems ,
- There are dens that have never been seen before on the GIF that is the heading of the Epic Den Challenges. It is rumored that these dens may soon be released.
- Diamond Shop dens can be obtained in den shops, but they still must be bought with diamonds.
- Other than the small den, the most least expensive den is the Volcano Den