Auburn Flag

Auburn

County:
Sangamon County
County Seat:
No
Area (mi²):
4.124
State:
Illinois

Auburn is a city located in Sangamon County, Illinois. Auburn has a 2025 population of 4,376. Auburn is currently declining at a rate of -0.77% annually and its population has decreased by -3.72% since the most recent census, which recorded a population of 4,545 in 2020.

The average household income in Auburn is $97,026 with a poverty rate of 6.65%.The median age in Auburn is 36 years: 33.2 years for males, and 38.2 years for females.

4.4K
Total Population
1,061
Density (mi²)
-34 -0.77%
Growth

Auburn Population

Auburn Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Auburn includes 97.43% White, and smaller percentages for Two or more races and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White4,24597.43%
Two or more races1122.57%

Auburn Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Auburn's average per capita income is $50,066. Household income levels show a median of $79,475. The poverty rate stands at 6.65%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$119,704-
Families$113,514$122,620
Households$79,475$97,026
Non Families$41,944$48,985

$50,066

Average Income

$79,475

Median Household Income

6.65%

Poverty Rate

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)