Wasilla is a city in Matanuska-Susitna Borough, United States and the sixth-largest city in Alaska. It is located on the northern point of Cook Inlet in the Matanuska-Susitna Valley of the southcentral part of the state. The city's population was 7,831 at the 2010 census. Estimates in 2013 put the population at roughly 8,621. Wasilla is the largest city in the borough and a part of the Anchorage metropolitan area, which had an estimated population of 396,142 in 2013.