average family size was 2.89. In the village, the population was spread out, with 23.3% under the age of 18, 7.5% from 18 to 24, 28.9% from 25 to 44, 23.6% from 45 to 64, and 16.8% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 101.4 males. For every 100 females age 18 and over, there were 94.6 males. The median income for a household in the village was $33,828, and the median income for a family was $40,652. Males had a median income of $31,694 versus $20,156 for females. The per capita income for the village was $16,160. About 10.3% of families and 13.0% of the population were below the poverty line, including 20.8% of those under age 18 and 4.6% of those age 65 or over. Underground gas plume Numerous oil refineries have occupied the area for many years. An estimated 4 million gallons of gasoline have seeped into the ground under Hartford. The village filed suit on July 21, 2008, against multiple parties over the underground gas plume. Chemetco, Inc The copper smelter Chemetco operated nearby for around 30 years, ending in 2001. The corporation was found guilty of Clean Water Act offenses after its sustained pollution of Long Lake, a tributary of the Mississippi River, over a ten-year period. This ended following the detection by EPA inspectors of a secret hazardous waste pipe in September 1996. The location, just south of Hartford near the community of Mitchell, was listed as a Superfund priority cleanup site March 4, 2010. Notable people Hartford is the birthplace of actor Clint Walker, known for the television series Cheyenne and for the movies The Ten Commandments and The Dirty Dozen. See also Hartford Castle References External links "Chemetco: One polluter, three perspectives" - Original case study of the sustained criminal pollution of Long Lake by Chemetco Villages in Madison County, Illinois Villages in Illinois Illinois populated places on the Mississippi River