St. Clair County Population

1830–2026

160.67K

2026 projection

0.2% since 2020 (increase)

050K100K150K200K1850190019502000

Source: U.S. Census Bureau decennial counts and annual estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for St. Clair County. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
2026160,668+1820.11%
2025160,486+1820.11%
2024160,304+250.02%
2023160,279+3930.25%
2022159,886-3820.24%
2021160,268-1180.07%
2020160,386+1,0470.66%
2019159,339+1530.10%
2018159,186+560.04%
2017159,130-3470.22%

Showing 10 of 34 years.

St. Clair County Demographics

44.5median age

Median age

Female45.5 yrs
Male43.4 yrs

Adults

127,743
32,649 seniors (65+) · 26% of adults95,094 other adults

Sex

Female 49.9% · 79,977Male 50.1% · 80,244

Population by age

MaleFemale85+ years, male: 1,39985+ years, female: 2,23080–84 years, male: 1,66080–84 years, female: 1,92575–79 years, male: 2,42275–79 years, female: 2,98270–74 years, male: 4,46270–74 years, female: 4,30765–69 years, male: 5,36965–69 years, female: 5,89360–64 years, male: 6,39960–64 years, female: 6,25355–59 years, male: 6,35155–59 years, female: 6,43850–54 years, male: 5,63450–54 years, female: 5,64245–49 years, male: 4,89545–49 years, female: 4,83840–44 years, male: 4,64540–44 years, female: 4,51335–39 years, male: 4,34335–39 years, female: 4,71330–34 years, male: 4,60930–34 years, female: 4,41625–29 years, male: 4,90825–29 years, female: 4,39420–24 years, male: 4,53320–24 years, female: 4,15315–19 years, male: 5,21415–19 years, female: 4,58710–14 years, male: 5,14310–14 years, female: 4,6905–9 years, male: 4,2995–9 years, female: 4,2100–4 years, male: 3,9590–4 years, female: 3,79385+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–42K2K4K4K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 1,602 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

St. Clair County Income

$71,270median household income

Median household income

$71,270

Half of households earn more, half earn less

Median earnings

$47,476

Typical yearly pay for a worker 25 or older.

Poverty rate

11.3%

About 1 in 9 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

St. Clair County Marital Status

52% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married52%53%52%
Never married28%31%25%
Divorced12%12%13%
Widowed6%3%10%
Separated<1%<1%1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

8 sources, all from the U.S. Census Bureau

Population

American Community Survey, 2024 5-year