Las Vegas, Nashville and Orlando were the top three searched for cities on MapQuest in 2013. The results are a compilation of destinations searched for on both MapQuest's website and its recently updated-and critically acclaimed-iPhone and Android apps. [Full disclosure: AOL owns both MapQuest and Gadling.]
Texas was the only state with two cities in MapQuest's top 10 list: Houston was eighth and Dallas was ninth. Feel free to criticize these travelers for not going to Austin instead in the comments.
Here are MapQuest's top 10 most-searched for destinations of 2013: