Middletown is located 3 miles (5 km) north of the Three Mile Island Nuclear Power Plant. The Unit #2 reactor at the Three Mile Island Nuclear Power Plant suffered a partial meltdown in 1979, causing then-Governor Richard "Dick" Thornburgh to order the evacuation of pregnant women and pre-school children from the area. Within days, 140,000 people had left the area. President Jimmy Carter visited Middletown's Community Building to calm the nerves of anxious residents.