According to AppData, CityVille now has 16.8 million daily active users, compared to FarmVille’s 16.4 million. Looking at monthly active users, CityVille is also ahead with 61.7 million users, while FarmVille trails behind quite a bit with 56.8 million users.

Zynga also holds two more places in the top five with FrontierVille andTexas HoldEm Poker: put those four apps together (we’ll disregard the fact that many of those users overlap for a second) and you have a very impressive number: 184 million active users across four games. The only non-Zynga app in the top 5 list is Phrases, which at one point threatened to take the top place but is now overshadowed by both CityVille and FarmVille.

CityVille’s future success wasn’t hard to predict after an amazingly good start at the beginning of December, but it’s still impressive to see Zynga amassing tens of millions of users in a matter of days, proving that all thatventure capital that went into the company isn’t there by accident.