Marion Flag

Marion

County Seat:
Yes
Area (mi²):
14.403
State:
Illinois

Marion is a city located in Williamson County, Illinois. Marion has a 2026 population of 17,116. It is also the county seat of Williamson County. Marion is currently growing at a rate of 0.28% annually and its population has increased by 1.69% since the most recent census, which recorded a population of 16,831 in 2020.

The median household income in Marion is $56,912 with a poverty rate of 13.34%. The median age in Marion is 42.2 years: 40.6 years for males, and 43.6 years for females. For every 100 females there are 91.1 males.

17.1K
Total Population
1,188
Density (mi²)
48 0.28%
Growth

Marion Population

Marion Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202617,116480.28%
202517,068470.28%
202417,0211630.97%
202316,8581620.97%
202216,696-40-0.24%
202116,736-95-0.56%
202016,831-17-0.1%
201917,510-82-0.47%
201817,592170.1%
201717,575-75-0.42%
201617,650490.28%
201517,601-134-0.76%
201417,735-9-0.05%
201317,7444002.31%
201217,344140.08%
201117,330990.57%
201017,231380.22%
200016,0351,49010.24%
199014,5455143.66%
198014,0312,30719.68%
197011,7244503.99%
196011,2748157.79%
195010,4591,20813.06%
19409,2512182.41%
19309,033-549-5.73%
19209,5822,48935.09%
19107,0934,583182.59%
19002,51000%

Median Age

Overall: 42.2 years
Female: 43.6 years
Male: 40.6 years

Marion Adults

There are 13,299 adults, (3,963 of whom are seniors) in Marion.

Sex Ratio

Female: 8,810 (52.3%)
Male: 8,026 (47.7%)

Demographics

The racial composition of Marion includes 85.65% White, 8.27% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White14,42085.65%
Black or African American1,3928.27%
Two or more races5323.16%
Asian4632.75%
Other race160.1%
Native American130.08%
Race
Population ↓
Percentage (of total)
White1951.16%
Two or more races1330.79%
Asian650.39%
Black or African American470.28%
Other race100.06%
Race
Population ↓
Percentage (of total)
White14,22584.49%
Black or African American1,3457.99%
Two or more races3992.37%
Asian3982.36%
Native American130.08%
Other race60.04%

Marion Marital Status

Economics and Income Statistics

Marion 's average per capita income is $48,672. Household income levels show a median of $56,912. The poverty rate stands at 13.34%.

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$109,238-
Families$84,311$103,622
Households$56,912$79,224
Non Families$34,592$49,665

$48,672

Average Income

$56,912

Median Household Income

13.34%

Poverty Rate

Nearby Cities

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)