Irvine is the country's largest and best-known planned community. It is a planned city, mainly developed by the Irvine Company since the 1960s. Formally incorporated in 1971, the 46-square mile city has a population of 199,755 (as of 2006). So if you are interested in a well planned city, then Irvine is place for you.Irvine is currently has plans to annex an undeveloped area to the north, and has already annexed the former El Toro Marine Corps Air Station, most of which is to be made into a park called the Orange County Great Park.