15.5% of the population. There were 5,084 households, out of which 31.7% had children under the age of 18 living with them, 50.8% were married couples living together, 9.3% had a female householder with no husband present, and 36.5% were non-families. 31.0% of all households were made up of individuals, and 13.2% had someone living alone who was 65 years of age or older. The average household size was 2.40 and the average family size was 3.03. In the city, the population was spread out, with 25.0% under the age of 18, 8.7% from 18 to 24, 29.6% from 25 to 44, 20.4% from 45 to 64, and 16.3% who were 65 years of age or older. The median age was 37 years. For every 100 females, there were 95.4 males. For every 100 females age 18 and over, there were 93.0 males. The median income for a household in the city was $62,563 and the median income for a family was $54,987. Males had a median income of $44,071 versus $25,206 for females. The per capita income for the city was $22,256. About 5.0% of families and 6.6% of the population were below the poverty line, including 7.2% of those under age 18 and 6.7% of those age 65 or over. Industries The Allen Paper Car Wheel Works were based on East North Street in Morris, which supplied the Pullman Palace Car Company in Chicago from 1867 to 1890 with composite wheels for their railway carriages. By the 1920s, the paper mill had become one of the largest employers in Morris, producing cardboard boxes of various shapes, sizes, and colors that were shipped throughout the US. The Lyondell Chemical Company is located about from the city center. The plant, located just off U.S. Route 6 heading eastbound away from Morris, employs many Morris residents. In addition to the chemical plant, three nuclear power plants are located within a radius of the center of Morris. The closest nuclear plant is only away, called the Dresden Nuclear Power Station. The LaSalle Nuclear Station is away, and Braidwood Generating Station is about away. All of the stations are owned by Exelon Corp. Among the stations, Dresden Generating Station generates energy for Chicago and surrounding areas. Telephone switching history In early 1960, the world's first electronic switching system was installed at the Morris central office. The system was a milestone in telephone switching