WAAAAHHH! There are only four villagers left.

[The Cat]

You need to plant lots of flowers if you want other animals to move to your town.

[Fishmael]

16? Is that counting Nook/Copper etc?

[SuperMarioBro#1]

You must have scared them away, popping up in a hole next to them, pretending to erase their data! J/K! Well, don't know what to tell ya buddy, don't know what ta tell ya!

[The Cat]

Originally posted by Marth:
i thought 5 was the min and 15 was the max

I don't think so. I saw a picture in the Animal Crossing Player's Guide and it showed a town with only three villagers.

[A Genius]

Check the wishing well. It will give you hints on how to improve your town.

-A Genius (WELL TELL HOW TOWN CAN IMPROVES)