Google Maps has reportedly taken a lead from MapQuest as top mapping site in the US. MapQuest’s January unique visitors were 41.5 million and Google’s 42.2 million. However, comScore still shows that MapQuest sessions are longer than Google Maps:

According to the January comScore report, on MapQuest, there are 89% more pages viewed per visitor per month than on Google Maps, and visitors spent 57% more minutes (14.4 compared to 9.2 minutes) on MapQuest versus Google Maps.