thumb|left|1655 Ryves Holt House, the oldest structure in Delaware According to the United States Census Bureau, the city has a total area of , of which is land, and (14.7%) is water.
thumb|left|1655 RYves HolT housE, the olDeST StrUCtUre in delawARe AccordinG to THE UNited stAtes ceNsus BuReau, THe city has a toTAl AreA OF , of which Is LanD, And (14.7%) Is WateR.