Ipswich is the county town of Suffolk, England, located on the estuary of the River Orwell, about north east of London. The town has been continuously occupied since the Saxon period, and its port has been one of Englands most important for the whole of its history. Ipswich is a non-metropolitan district. The urban development of Ipswich overspills the borough boundaries significantly, with 75% of the towns population living within the borough at the time of the 2011 Census, when it was the fourth-largest urban area in the United Kingdoms East of England region, and the 42nd largest urban area in England and Wales. The modern name is derived from the medieval name Gippeswic, probably taken either from an Old Saxon personal name or from an earlier name of the Orwell estuary .