St. Clair County, Illinois

30 cities & places have their primary county here.

Population: 254,777
Median household income: $70,178
Median home value: $168,800

St. Clair County is a county in Illinois with a population of 254,777. 30 cities and places have their primary county here. At $70,178, its median household income sits below Illinois's $81,702.

Between 2019 and 2023, St. Clair County's population declined 2.9% from 262,338 to 254,777, while its median household income rose 27.2% from $55,179 to $70,178.

30.7% of adults 25 and older hold a bachelor's degree or higher. Owners occupy 67.8% of the area's occupied homes.

Demographics

ACS 2019–2023

Population: 254,777
Median age: 39.5 yrs
Median household income: $70,178
Median home value: $168,800
Median gross rent: $1,032
Housing units: 115,348
Homeownership rate: 67.8%
Bachelor's degree or higher: 30.7%
Unemployment rate: 5.7%

Trends

ACS 5-year · 2019–2023

Population

262,338254,777

Median household income

$55,179$70,178

Median home value

$128,000$168,800

Median gross rent

$861$1,032

Year	Population	Median household income	Median home value	Median gross rent
2019	262,338	$55,179	$128,000	$861
2020	261,186	$57,473	$134,800	$881
2021	258,597	$63,017	$140,600	$923
2022	256,791	$68,915	$158,500	$1,002
2023	254,777	$70,178	$168,800	$1,032

Each year is a US Census Bureau ACS 5-year estimate ending that year.

Age distribution

Under 55.8%

5 to 1717.4%

18 to 248.1%

25 to 3412.8%

35 to 4413.2%

45 to 5412.1%

55 to 6413.7%

65 to 7410.3%

75 and over6.5%

	Count	Share
Under 5	14,893	5.8%
5 to 17	44,434	17.4%
18 to 24	20,717	8.1%
25 to 34	32,536	12.8%
35 to 44	33,726	13.2%
45 to 54	30,725	12.1%
55 to 64	35,022	13.7%
65 to 74	26,276	10.3%
75 and over	16,448	6.5%

Race & ethnicity

	Count	Share
White (non-Hispanic)	151,513	59.5%
Black or African American	70,841	27.8%
American Indian & Alaska Native	571	0.2%
Asian	3,931	1.5%
Native Hawaiian & Pacific Islander	51	0.0%
Some other race	1,276	0.5%
Two or more races	13,994	5.5%
Hispanic or Latino (any race)	12,600	4.9%

Educational attainment (age 25+)

No high school diploma7.3%

High school graduate27.0%

Some college or associate's35.0%

Bachelor's degree17.6%

Graduate or professional degree13.2%

	Count	Share
No high school diploma	12,677	7.3%
High school graduate	47,198	27.0%
Some college or associate's	61,139	35.0%
Bachelor's degree	30,694	17.6%
Graduate or professional degree	23,025	13.2%

Commute to work

Mean travel time to work: 25 min

Drove alone76.9%

Carpooled7.7%

Public transit1.9%

Walked1.5%

Bicycle0.1%

Worked from home10.9%

Other means1.0%

How workers get to work

	Count	Share
Drove alone	91,200	76.9%
Carpooled	9,081	7.7%
Public transit	2,245	1.9%
Walked	1,825	1.5%
Bicycle	156	0.1%
Worked from home	12,866	10.9%
Other means	1,161	1.0%

Travel time

	Count	Share
Under 15 min	28,616	27.1%
15 to 29 min	41,279	39.1%
30 to 44 min	22,434	21.2%
45 to 59 min	8,110	7.7%
60+ min	5,229	4.9%

Households

Average household size: 2.47
Poverty rate: 13.6% (33,836 of 249,619)

	Count	Share
Family households	64,241	63.4%
Nonfamily households	37,032	36.6%

Housing

Median year structure built: 1975

Occupancy

	Count	Share
Occupied	101,273	87.8%
Vacant	14,075	12.2%

Tenure (of occupied units)

	Count	Share
Owner-occupied	68,653	67.8%
Renter-occupied	32,620	32.2%

1-unit, detached71.4%

1-unit, attached4.7%

2 to 4 units8.0%

5 to 19 units8.2%

20 or more units3.2%

Mobile home & other4.6%

Units in structure

	Count	Share
1-unit, detached	82,309	71.4%
1-unit, attached	5,426	4.7%
2 to 4 units	9,183	8.0%
5 to 19 units	9,435	8.2%
20 or more units	3,675	3.2%
Mobile home & other	5,320	4.6%

Geography

County GEOID: 17163
State: Illinois
Land area: 658 sq mi
Water area: 16 sq mi
Center point: 38.4702, -89.9285

Compare with nearby counties

Other counties in Illinois

101