Avon is a village in Fulton County, Illinois, United States. The population was 799 at the 2010 census, down from 915 at the 2000 census.
Avon is located in northwestern Fulton County at 40°39′44″N 90°26′8″W / 40.66222°N 90.43556°W / 40.66222; -90.43556 (40.662254, -90.435485). A small portion of the village extends west into Warren County. Illinois Route 41 passes through the village, leading north 21 miles (34 km) to Galesburg and southwest 10 miles (16 km) to Bushnell.
According to the 2010 census, Avon has a total area of 0.45 square miles (1.17 km), all land.
As of the census of 2000, there were 915 people, 375 households, and 260 families residing in the village. The population density was 2,065.3 people per square mile (802.9/km²). There were 403 housing units at an average density of 909.6 per square mile (353.6/km²). The racial makeup of the village was 98.80% White, 0.11% Native American, 0.11% Asian, 0.66% from other races, and 0.33% from two or more races. Hispanic or Latino of any race were 0.77% of the population.
There were 375 households out of which 29.1% had children under the age of 18 living with them, 52.3% were married couples living together, 12.5% had a female householder with no husband present, and 30.4% were non-families. 26.7% of all households were made up of individuals and 15.2% had someone living alone who was 65 years of age or older. The average household size was 2.44 and the average family size was 2.93.
In the village, the population was spread out with 24.0% under the age of 18, 8.3% from 18 to 24, 25.0% from 25 to 44, 21.9% from 45 to 64, and 20.8% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 93.9 males. For every 100 females age 18 and over, there were 86.3 males.
The median income for a household in the village was $33,417, and the median income for a family was $38,819. Males had a median income of $30,167 versus $21,429 for females. The per capita income for the village was $16,257. About 9.9% of families and 11.7% of the population were below the poverty line, including 16.7% of those under age 18 and 10.8% of those age 65 or over.