Gilbert is a town in Maricopa County, Arizona, USA. Gilbert was the fastest-growing incorporated place of over 100,000 people in the United States from 1990 to 2000, as well as in the 2002, 2003, and 2004 Census estimates. As of the 2000 census, the town had a total population of 109,697, but as of July, 2004, a Census estimate put the fast-growing suburb's population at just over 156,000, a growth of more than 46,000 people or 42% over the four-year period. In April 2005, the Town was estimated to have a population of 165,685. Although it is large and growing rapidly, Gilbert is still incorporated as a town rather than as a city; it has the highest population of any area incorporated as a town in the United States (and the second largest in North America, after Markham, Ontario, Canada), and as of the 2000 census was the only town with more than 100,000 people. Gilbert was also the fastest-growing place among all cities and towns in Arizona of any size from 1990 and 2000.