Alvin is a village in South Ross Township, Vermilion County, Illinois, United States. It is part of the Danville, Illinois Metropolitan Statistical Area. The population was 316 at the 2000 census. The U.S. Post Office uses the name Alvin, however the village is also known by the alternate spelling Alvan (for example, by the U.S. Census Bureau).
Alvan is located on County Road 3 about 2 miles north of Bismarck, Illinois. The coordinates are 40°18′34″N 87°36′25″W / 40.30944°N 87.60694°W / 40.30944; -87.60694 (40.309494, -87.606887).
According to the 2010 census, Alvin has a total area of 0.79 square miles (2.05 km), all land.
As of the census of 2000, there were 316 people, 106 households, and 85 families residing in the village. The population density was 397.2 people per square mile (152.5/km²). There were 115 housing units at an average density of 144.6 per square mile (55.5/km²). The racial makeup of the village was 97.78% White, 1.58% Native American, 0.32% Asian, and 0.32% from two or more races. Hispanic or Latino of any race were 0.63% of the population.
There were 106 households out of which 49.1% had children under the age of 18 living with them, 59.4% were married couples living together, 14.2% had a female householder with no husband present, and 19.8% were non-families. 19.8% of all households were made up of individuals and 8.5% had someone living alone who was 65 years of age or older. The average household size was 2.98 and the average family size was 3.35.
In the village, the population was spread out with 34.5% under the age of 18, 7.6% from 18 to 24, 29.7% from 25 to 44, 19.6% from 45 to 64, and 8.5% who were 65 years of age or older. The median age was 30 years. For every 100 females, there were 92.7 males. For every 100 females age 18 and over, there were 89.9 males.
The median income for a household in the village was $36,000, and the median income for a family was $38,333. Males had a median income of $30,278 versus $18,194 for females. The per capita income for the village was $13,773. About 7.0% of families and 8.2% of the population were below the poverty line, including 8.2% of those under age 18 and 31.6% of those age 65 or over.