Carmi is a city in White County, Illinois, along the Little Wabash River. The population was 5,240 at the 2010 census. It is the county seat of White County.
As of the census of 2010, there were 5,240 people, 2,290 households, and 1,477 families residing in the city. The population density was 2,187.7 people per square mile (844.1/km²). There were 2,667 housing units at an average density of 1,076.1 per square mile (415.2/km²). The racial makeup of the city was 98.30% White, 0.48% African American, 0.35% Native American, 0.24% Asian, 0.06% from other races, and 0.57% from two or more races. Hispanic or Latino of any race were 0.65% of the population.
There were 2,390 households out of which 23.8% had children under the age of 18 living with them, 49.7% were married couples living together, 9.2% had a female householder with no husband present, and 38.2% were non-families. 35.3% of all households were made up of individuals and 20.3% had someone living alone who was 65 years of age or older. The average household size was 2.16 and the average family size was 2.78.