Wow, I live in a city with no real disaster to ever happen. Wilmington has never had a big fire, or a big flood, or a significant tornado, or anything like that. There have been hurricanes that have passed over this area: Floyd in 1999, Henri and Isabel in 2003, Irene in 2011, and Sandy in 2012. These caused floods, but nothing like the flooding from Katrina in New Orleans, Harvey in Houston, and others.
The state of Delaware has not had too many bad storms either. Sandy's eye passed over Ocean City, Maryland, a quarter-mile or half-mile south of Fenwick Island, so we were less than a mile away from our first hurricane technically making landfall on Delaware back then. ("Landfall" is considered when the eye of the storm comes over land.)
The worst disaster in state history is the noreaster of 1962. Noreasters, as many on the East Coast know, are basically winter hurricanes. You get the same cyclonic activity, and the same precipitation and winds in many cases. Most times the precipitation is snow. This storm in 1962 was considered one of the worst storms of the 20th century, right up there with the worst hurricanes.
Rehoboth Beach took a huge beating from the storm, and most of the buildings on the coast were destroyed. 7 of the 40 casualties from the storm took place in Delaware.
There's lots of pictures from the storm here.