|Area||0.30 sq mi (1 km2)|
|- land||0.30 sq mi (1 km2)|
|- water||0.00 sq mi (0 km2)|
|Density||296.9 / sq mi (115 / km2)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Muddy, Illinois|
Muddy is a small incorporated village located in the Harrisburg Township in Saline County, Illinois, United States. The population was 68 at the 2010 census. Muddy was built as a coal mining village to house miners working in O'gara #12 mine located on the north bank of the Saline River. Its sister city of Harrisburg is located on the south bank.
Muddy, until 2002, held the smallest post office in the United States. A larger building adjacent to the former post office was constructed to better serve its citizens. The old post office remains, and the sign now reads "OLD MUDDY POST OFFICE".
Muddy is located at (37.764086, -88.514469).
According to the 2010 census, the village has a total area of 0.30 square miles (0.78 km2), all land.
As of the census of 2010, there were 68 people, 34 households, and 21 families residing in the village. The population density was 296.9 people per square mile (115.8/km²). There were 39 housing units at an average density of 148.5 per square mile (57.9/km²). The racial makeup of the village was 88.46% White, 5.13% African American, 2.56% Native American, 3.85% from other races. Hispanic or Latino of any race were 3.85% of the population.
There were 34 households out of which 38.2% had children under the age of 18 living with them, 44.1% were married couples living together, 8.8% had a female householder with no husband present, and 38.2% were non-families. 38.2% of all households were made up of individuals and 8.8% had someone living alone who was 65 years of age or older. The average household size was 2.29 and the average family size was 2.95.
In the village the population was spread out with 24.4% under the age of 18, 17.9% from 18 to 24, 17.9% from 25 to 44, 26.9% from 45 to 64, and 12.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 110.8 males. For every 100 females age 18 and over, there were 90.3 males.
The median income for a household in the village was $24,375, and the median income for a family was $28,750. Males had a median income of $28,750 versus $28,250 for females. The per capita income for the village was $13,384. There were no families and 7.7% of the population living below the poverty line, including no under eighteens and none of those over 64.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- Story of The Church of St. Iosaph in Muddy, Illinois at stbasilthegreat.org
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.