Demographics of St. Clair County, Alabama

St. Clair County, Alabama had 98,206 people on July 1, 2025, by the Census Bureau’s estimate: +6,503 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

St. Clair County, in four figures

98,206
Population: July 1, 2025, Vintage 2025 estimate.; +7.1%
Change since July 2020: +6,503 people.; 41.2 ±0.5
Median age: ACS 2020–⁠2024.; $77,463 ±$4,349
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

St. Clair County, Alabama's population grew 7.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of St. Clair County, Alabama's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

St. Clair County, Alabama's population grew 7.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of St. Clair County, Alabama's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	91,703	100.0	100.0
2021	92,898	101.3	100.2
2022	93,914	102.4	100.7
2023	95,578	104.2	101.6
2024	97,046	105.8	102.5
2025	98,206	107.1	103.1

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Population of St. Clair County, Alabama on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	91,703	+199	−29	0	+216
2021	92,898	+1,195	−357	+8	+1,569
2022	93,914	+1,016	−260	+23	+1,229
2023	95,578	+1,664	−108	+30	+1,709
2024	97,046	+1,468	−90	+64	+1,473
2025	98,206	+1,160	−96	+11	+1,247

Age, 2020–2024

The median age is 41.2 ±0.5: for men 38.9 ±0.8 and for women 42.5 ±0.4. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in St. Clair County by age, ACS 2020–2024
Age	People	Share	Alabama	United States
Under 5	5,137 ±132	5.5% ±0.1	5.8% ±<0.1	5.6% ±<0.1
5 to 17	15,803 ±707	16.8% ±0.8	16.5% ±0.1	16.3% ±<0.1
18 to 24	6,919 ±460	7.3% ±0.5	9.5% ±0.1	9.1% ±<0.1
25 to 44	24,756 ±779	26.3% ±0.8	25.3% ±0.1	26.9% ±<0.1
45 to 64	24,719 ±826	26.3% ±0.9	25.2% ±0.1	24.8% ±<0.1
65 and over	16,832 ±845	17.9% ±0.9	17.8% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $77,463 ±$4,349, and income per person $34,786 ±$1,274, in 2024 dollars. The median is $63,999 ±$399 in Alabama and $80,734 ±$166 in the United States.

Households by income

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Households in St. Clair County by income, ACS 2020–2024
Household income	Households	Share	Alabama	United States
Under $25,000	4,612 ±583	13.1% ±1.7	19.7% ±0.3	14.6% ±<0.1
$25,000 to $49,999	6,209 ±680	17.7% ±1.9	20.3% ±0.3	16.7% ±<0.1
$50,000 to $74,999	6,161 ±595	17.5% ±1.7	16.7% ±0.2	15.5% ±<0.1
$75,000 to $99,999	5,378 ±662	15.3% ±1.9	12.7% ±0.2	12.6% ±<0.1
$100,000 to $149,999	7,897 ±768	22.5% ±2.2	15.5% ±0.2	17.5% ±<0.1
$150,000 to $199,999	2,787 ±406	7.9% ±1.2	7.4% ±0.2	9.6% ±<0.1
$200,000 or more	2,063 ±388	5.9% ±1.1	7.8% ±0.1	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in St. Clair County by age, ACS 2020–2024
Age	Below poverty	Rate	Alabama	United States
All ages	10,452 ±1,277	11.4% ±1.4	15.6% ±0.2	12.5% ±0.1
Under 18	3,310 ±536	15.9% ±2.5	21.3% ±0.4	16.1% ±0.1
18 to 59	5,144 ±781	10.5% ±1.6	14.7% ±0.2	11.6% ±0.1
60 and over	1,998 ±341	8.9% ±1.5	12.4% ±0.2	11.0% ±<0.1

Housing, 2020–2024

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Housing in St. Clair County, ACS 2020–2024
Measure	St. Clair County	Alabama	United States
Housing units	39,247 ±52	2,337,265 ±430	143,775,355 ±10,234
Occupied	89.5% ±1.3	85.5% ±0.3	89.9% ±0.1
Vacant	10.5% ±1.2	14.5% ±0.3	10.1% ±0.1
Owner occupied	82.6% ±1.6	70.2% ±0.4	65.2% ±0.3
Renter occupied	17.4% ±1.9	29.8% ±0.3	34.8% ±0.1
Median home value	$226,300 ±$6,451	$209,900 ±$1,076	$332,700 ±$236
Median gross rent	$1,084 ±$66	$1,007 ±$8	$1,413 ±$2
Median year built	1998 ±1	1986 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in St. Clair County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Alabama	United States
Hispanic or Latino	2,805 ±0	3.0% ±<0.1	5.6% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	78,235 ±183	83.1% ±0.2	63.4% ±<0.1	57.4% ±<0.1
Black alone, not Hispanic	9,458 ±492	10.0% ±0.5	25.6% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	537 ±206	0.6% ±0.2	1.4% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	294 ±89	0.3% ±0.1	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 184	0% to 0.2%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	56 to 454	0.1% to 0.5%	0.4% ±<0.1	0.6% ±<0.1
Two or more races, not Hispanic	2,497 ±562	2.7% ±0.6	3.3% ±0.1	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in St. Clair County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Alabama	United States
Born in the state	71,760 ±1,464	76.2% ±1.6	67.5% ±0.2	57.3% ±<0.1
Born in another state	20,191 ±1,496	21.4% ±1.6	27.6% ±0.2	26.9% ±<0.1
Born a citizen outside the states	604 ±247	0.6% ±0.3	1.0% ±<0.1	1.7% ±<0.1
Born abroad	1,611 ±365	1.7% ±0.4	4.0% ±0.1	14.1% ±<0.1
Naturalized citizens	891 ±273	0.9% ±0.3	1.6% ±0.1	7.4% ±<0.1
Not citizens	720 ±260	0.8% ±0.3	2.4% ±0.1	6.8% ±<0.1

St. Clair County among the counties of Alabama

15th of 67 by population, July 2025. Every one is listed on the Alabama page.

Counties of Alabama near St. Clair County in population, July 2025
County	July 2025	Change since 2020
Limestone County	122,928	+18.0%
Calhoun County	115,834	−0.3%
Houston County	110,318	+2.8%
Etowah County	103,886	+0.4%
Marshall County	103,537	+6.0%
St. Clair County	98,206	+7.1%
Lauderdale County	97,135	+3.3%
Cullman County	94,009	+6.7%
Elmore County	91,577	+4.2%
Talladega County	81,603	+0.3%
DeKalb County	74,085	+3.4%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026