St. Clair County Population

1800–2026

250.04K

2026 projection

2.7% since 2020 (decrease)

050K100K150K200K250K300K18001850190019502000

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.
2026250,041-6670.27%
2025250,708-6670.27%
2024251,375-8570.34%
2023252,232-5980.24%
2022252,830-2,3640.93%
2021255,194-1,8630.72%
2020257,057-2,8321.09%
2019259,889-1,7420.67%
2018261,631-1,2500.48%
2017262,881-6010.23%

Showing 10 of 37 years.

St. Clair County Demographics

39.9median age

Median age

Female40.9 yrs
Male38.6 yrs

Adults

195,281
44,007 seniors (65+) · 23% of adults151,274 other adults

Sex

Female 51.5% · 130,583Male 48.5% · 123,111

Population by age

MaleFemale85+ years, male: 1,93785+ years, female: 3,29180–84 years, male: 1,97280–84 years, female: 2,79675–79 years, male: 2,92375–79 years, female: 4,05770–74 years, male: 5,81570–74 years, female: 6,74265–69 years, male: 6,78865–69 years, female: 7,68660–64 years, male: 8,76760–64 years, female: 9,33055–59 years, male: 7,74955–59 years, female: 8,40550–54 years, male: 7,29950–54 years, female: 8,10045–49 years, male: 7,19545–49 years, female: 7,71440–44 years, male: 8,77040–44 years, female: 9,10335–39 years, male: 7,55135–39 years, female: 8,53330–34 years, male: 7,90430–34 years, female: 8,58325–29 years, male: 7,81525–29 years, female: 7,82020–24 years, male: 7,46920–24 years, female: 7,07815–19 years, male: 8,49115–19 years, female: 8,04410–14 years, male: 8,91210–14 years, female: 8,6245–9 years, male: 8,4085–9 years, female: 7,6020–4 years, male: 7,3460–4 years, female: 7,07585+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45K5K

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 2,537 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

$73,854median household income

Median household income

$73,854

Half of households earn more, half earn less

Median earnings

$50,612

Typical yearly pay for a worker 25 or older.

Poverty rate

13.6%

About 1 in 7 residents

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

St. Clair County Marital Status

46% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married46%48%44%
Never married35%37%32%
Divorced11%10%12%
Widowed6%3%9%
Separated2%2%3%

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