U.S. Route 50 bypasses the village to the north, leading east 14 miles (23 km) to Carlyle, the county seat, and west 16 miles (26 km) to Interstate 64 near O'Fallon. Downtown St. Louis is 35 miles (56 km) west of Aviston.
According to the 2021 census gazetteer files, Aviston has a total area of 1.60 square miles (4.14 km2), all land.[5]
As of the 2020 census[7] there were 2,340 people, 739 households, and 515 families residing in the village. The population density was 1,462.50 inhabitants per square mile (564.67/km2). There were 863 housing units at an average density of 539.38 per square mile (208.26/km2). The racial makeup of the village was 94.36% White, 0.34% African American, 0.47% Native American, 0.51% Asian, 0.04% Pacific Islander, 0.73% from other races, and 3.55% from two or more races. Hispanic or Latino of any race were 2.52% of the population.
There were 739 households, out of which 36.4% had children under the age of 18 living with them, 59.00% were married couples living together, 7.17% had a female householder with no husband present, and 30.31% were non-families. 23.95% of all households were made up of individuals, and 9.61% had someone living alone who was 65 years of age or older. The average household size was 3.37 and the average family size was 2.82.
The village's age distribution consisted of 26.9% under the age of 18, 7.1% from 18 to 24, 29.4% from 25 to 44, 24.1% from 45 to 64, and 12.5% who were 65 years of age or older. The median age was 35.2 years. For every 100 females, there were 99.0 males. For every 100 females age 18 and over, there were 97.6 males.
The median income for a household in the village was $81,198, and the median income for a family was $108,304. Males had a median income of $50,833 versus $40,852 for females. The per capita income for the village was $36,182. About 3.9% of families and 3.0% of the population were below the poverty line, including 2.9% of those under age 18 and 4.2% of those age 65 or over.
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