Coyne Center is a census-designated place (CDP) in Rock Island County, Illinois, United States. The population was 827 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 1.8 square miles (4.7 km), all land.
As of the census of 2000, there were 906 people, 352 households, and 290 families residing in the CDP. The population density was 505.4 people per square mile (195.4/km²). There were 356 housing units at an average density of 198.6/sq mi (76.8/km²). The racial makeup of the CDP was 98.68% White, 0.77% African American, 0.11% Asian, 0.22% from other races, and 0.22% from two or more races. Hispanic or Latino of any race were 0.88% of the population.
There were 352 households out of which 28.1% had children under the age of 18 living with them, 71.3% were married couples living together, 6.8% had a female householder with no husband present, and 17.6% were non-families. 12.5% of all households were made up of individuals and 4.8% had someone living alone who was 65 years of age or older. The average household size was 2.57 and the average family size was 2.80.
In the CDP, the population was spread out with 20.8% under the age of 18, 5.4% from 18 to 24, 25.1% from 25 to 44, 33.1% from 45 to 64, and 15.7% who were 65 years of age or older. The median age was 44 years. For every 100 females, there were 99.6 males. For every 100 females age 18 and over, there were 97.8 males.
The median income for a household in the CDP was $50,000, and the median income for a family was $47,422. Males had a median income of $30,909 versus $23,750 for females. The per capita income for the CDP was $19,093. About 3.1% of families and 4.3% of the population were below the poverty line, including 6.6% of those under age 18 and 1.3% of those age 65 or over.