The village of Coal Valley is located in both Rock Island County and Henry County in the U.S. state of Illinois. The population was 3,743 at the 2010 census, up from 3,606 in 2000. It is mostly residential, housing families who work in or out of the greater Quad Cities Area and is considered a suburb. The students of the Rock Island County part of Coal Valley attend the Moline School District number 40, and in the Henry County portion, Orion Community Unit School District 223
Coal Valley is located at 41°26′23″N 90°27′21″W / 41.43972°N 90.45583°W / 41.43972; -90.45583 (41.439788, -90.455939).
According to the 2010 census, Coal Valley has a total area of 2.76 square miles (7.15 km), all land.
As of the census of 2000, there were 3,606 people, 1,373 households, and 1,059 families residing in the village. The population density was 1,260.5 people per square mile (486.8/km²). There were 1,444 housing units at an average density of 504.7 per square mile (194.9/km²). The racial makeup of the village was 97.06% White, 0.69% African American, 0.03% Native American, 0.42% Asian, 0.58% from other races, and 1.22% from two or more races. Hispanic or Latino of any race were 3.00% of the population.
There were 1,373 households out of which 33.8% had children under the age of 18 living with them, 64.6% were married couples living together, 9.0% had a female householder with no husband present, and 22.8% were non-families. 18.2% of all households were made up of individuals and 6.6% had someone living alone who was 65 years of age or older. The average household size was 2.63 and the average family size was 2.97.
In the village, the population was spread out with 24.8% under the age of 18, 9.1% from 18 to 24, 29.1% from 25 to 44, 27.4% from 45 to 64, and 9.6% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 99.3 males. For every 100 females age 18 and over, there were 96.7 males.
The median income for a household in the village was $49,228, and the median income for a family was $56,114. Males had a median income of $40,801 versus $23,529 for females. The per capita income for the village was $20,996. About 6.7% of families and 7.4% of the population were below the poverty line, including 10.6% of those under age 18 and 15.0% of those age 65 or over.