St. Clair County, Illinois's estimated 2024 population is 249,771 with a growth rate of -0.5% in the past year according to the most recent United States census data. St. Clair County, Illinois is the 9th largest county in Illinois. The 2010 population was 270,368 and has seen a growth of -7.62% since that time.
Year | Population | Growth | Growth Rate |
|---|---|---|---|
| 2029 | 243,536 | -1,247 | -0.51% |
| 2028 | 244,783 | -1,247 | -0.51% |
| 2027 | 246,030 | -1,247 | -0.5% |
| 2026 | 247,277 | -1,247 | -0.5% |
| 2025 | 248,524 | -1,247 | -0.5% |
| 2024 | 249,771 | -1,247 | -0.5% |
| 2023 | 251,018 | -1,247 | -0.49% |
| 2022 | 252,265 | -2,693 | -1.06% |
| 2021 | 254,958 | -1,886 | -0.73% |
| 2020 | 256,844 | -3,045 | -1.17% |
| 2019 | 259,889 | -1,742 | -0.67% |
| 2018 | 261,631 | -1,250 | -0.48% |
| 2017 | 262,881 | -601 | -0.23% |
| 2016 | 263,482 | -1,526 | -0.58% |
| 2015 | 265,008 | -1,053 | -0.4% |
| 2014 | 266,061 | -873 | -0.33% |
| 2013 | 266,934 | -1,814 | -0.67% |
| 2012 | 268,748 | -1,349 | -0.5% |
| 2011 | 270,097 | -271 | -0.1% |
| 2010 | 270,368 | 0 | 0% |
| 1990 | 262,852 | -4,679 | -1.75% |
| 1980 | 267,531 | -17,645 | -6.19% |
| 1970 | 285,176 | 22,667 | 8.63% |
| 1960 | 262,509 | 56,514 | 27.43% |
| 1950 | 205,995 | 39,096 | 23.42% |
| 1940 | 166,899 | 9,124 | 5.78% |
| 1930 | 157,775 | 21,255 | 15.57% |
| 1920 | 136,520 | 16,650 | 13.89% |
| 1910 | 119,870 | 33,185 | 38.28% |
| 1900 | 86,685 | 20,114 | 30.21% |
| 1890 | 66,571 | 4,765 | 7.71% |
| 1880 | 61,806 | 10,738 | 21.03% |
| 1870 | 51,068 | 13,374 | 35.48% |
| 1860 | 37,694 | 17,514 | 86.79% |
| 1850 | 20,180 | 6,549 | 48.04% |
| 1840 | 13,631 | 6,553 | 92.58% |
| 1830 | 7,078 | 1,825 | 34.74% |
| 1820 | 5,253 | 246 | 4.91% |
| 1810 | 5,007 | 3,652 | 269.52% |
| 1800 | 1,355 | -242,181 | -99.44% |
White
Black or African American
Two or more races
Other race
Asian
Native American
Native Hawaiian or Pacific Islander
Household Type | Count | Average Size | Owner | Renter |
|---|---|---|---|---|
| All | 100,701 | 2.51 | 67.9 | 32.1 |
| Married | 44,817 | 3.14 | 85.3 | 14.7 |
| Non Family | 36,488 | 1.17 | 55.1 | 44.9 |
| Female | 14,915 | 3.62 | 47.7 | 52.3 |
| Male | 4,481 | 3.34 | 65.7 | 34.3 |
3.17
Average Family Size
2.51
Average Household Size
67.9%
Rate of Home Ownership
Married
Male
Female
NonFamily
owner
renter
Male
Female
Less Than 9th Grade
9th to 12th Grade
High School Graduate
Some College
Associates Degree
Bachelors Degree
Graduate Degree
High School Graduation Rate
Bachelors Rate
The highest rate of high school graduation is among islander people with a rate of 100%.
The highest rate of bachelors degrees is among asian people with a rate of 54.26%.
All
Male
Female
$46,245
Average Earnings
$56,116
Average Male
$38,295
Average Female
Only English
Spanish
Other Indo-European Languages
Asian and Pacific Island Languages
Other Languages
95.05% of St. Clair County, Illinois residents speak only English, while 4.95% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.45% of the population.
rate
13.8%
Overall Poverty Rate
12.17%
Male Poverty Rate
15.33%
Female Poverty Rate
The race most likely to be in poverty in St. Clair County, Illinois is Black, with 26.54% below the poverty level.
The race least likely to be in poverty in St. Clair County, Illinois is White, with 7.44% below the poverty level.
The poverty rate among those that worked full-time for the past 12 months was 2.04%. Among those working part-time, it was 16.35%, and for those that did not work, the poverty rate was 21.49%.
Married
Widowed
Divorced
Separated
NeverMarried
45.7%
Overall Marriage Rate
48.1%
Male Marriage Rate
43.4%
Female Marriage Rate
male
female
The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.
Married
Widowed
Divorced
Separated
NeverMarried
Less Than 9th Grade
High School Graduate
Some College
Bachelors or Greater
6.81%
Veteran Poverty Rate
24.59%
Veteran Disability Rate
LaborForceParticipation
64.2%
Labor Force Participation
58.9%
Employment Rate
5.7%
Unemployment Rate
LaborForceParticipation
LaborForceParticipation
Europe
Asia
Africa
Oceania
Latin America
North America
Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.
Europe
Asia
Africa
Oceania
Latin America
North America
57.65%
Born in St. Clair County, Illinois
96.83%
Native Born
3.17%
Foreign Born
1.31%
Non Citizen
1.86%
Naturalized
96.83% of St. Clair County, Illinois residents were born in the United States, with 57.65% having been born in Illinois. 1.31% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.