St. Clair County, Alabama

County in AL, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

94,166

Source: U.S. Census Bureau American Community Survey (ACS) 2020-2024 5-Year Estimates

Median Age

41.2

years ∙ half population younger than 41.2, half older

Diversity Index

29.8%

chance two random people differ in race and ethnicity

Nativity

1.7%

foreign-born population

98.3%Native

1.7% Foreign-born

Geographic Context

Location, size, and surroundings

About

St. Clair County is a county in Alabama, United States.

Location

County in AL, US

Co-ordinates

DEC33.719491° N, 86.311327° W

DMS33° 43′ 10.17″ N, 86° 18′ 40.78″ W

Population Density & area

149.1/sq mi (57.56/km²)

Total Area

653.3 sq mi (1,692.2 km²)

Land Area

631.6 sq mi (1,635.9 km²) · 96.7%

Water Area

21.7 sq mi (56.3 km²) · 3.3%

Demographics & Living

Who lives here, how households are formed, and community composition

Population Composition

Key characteristics of the population

Sex Distribution

49.5% male

Male 49.5%

Female 50.5%

males per 100 females

St. Clair County 98

Alabama 94.4

United States 98

Nativity

1.7%

foreign-born population

98.3%Native

1.7% Foreign-born

% Foreign-born

St. Clair County 1.7%

Alabama 4%

United States 14.1%

Age Distribution

How the population is spread across age groups

Median Age

41.2

years ∙ half population younger than 41.2, half older

St. Clair County

41.2

Alabama

39.3

United States

38.9

Dependency ratio

dependents per 100 working-age adults

St. Clair County 67

Alabama 66.7

United States 64.4

AGE DISTRIBUTION

Distribution of age group

Median age

	St. Clair County	Alabama	United States
Age Group
Children (Under 18)	22.2%	22.2%	22%
Working age (18-64)	59.9%	60%	60.8%
Senior (65+)	17.9%	17.8%	17.2%
Dependency ratio
Total dependency ratio	67	66.7	64.4
Child dependency ratio	37.1	37.1	36.1
Old-age dependency ratio	29.8	29.6	28.3

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

83.1%

Black

10%

Asian

0.6%

Hispanic

Other

3.3%

Note: White, Black, and Asian refer to individuals belonging to a single race and not of Hispanic origin. Hispanics may be of any race.

Diversity Index

29.8%

chance two random people differ in race and ethnicity

St. Clair County 29.8%

Alabama 52.8%

United States 61.4%

Note: The Diversity Index (DI), based on the Blau Index, measures the probability that two randomly selected individuals differ in race and ethnicity. Values range from 0 (no diversity) to 1 (high diversity) and are shown as percentages.

RACIAL & ETHNIC COMPOSITION

Race & Ethnicity

Percentage of St. Clair County population

	St. Clair County	Alabama	United States
Hispanic or Latino	3%	5.6%	19.3%
Mexican	1.1%	3.2%	11.3%
Puerto Rican	0.6%	0.5%	1.8%
Cuban	0.2%	0.2%	0.8%
Other Hispanic / Latino	1.1%	1.7%	5.5%
Not Hispanic or Latino	97%	94.4%	80.7%
One race	94.3%	91.1%	76.4%
White	83.1%	63.4%	57.4%
Black or African American	10%	25.6%	11.9%
American Indian and Alaska Native	0.3%	0.3%	0.5%
Asian	0.6%	1.4%	5.9%
Native Hawaiian and Other Pacific Islander	0.1%	0%	0.2%
Some Other Race	0.3%	0.4%	0.6%
Two or more races (Multiracial)	2.7%	3.3%	4.3%

Household & Families Composition

Household size, type, and family structure

Household structure

72.3% family

Family 72.3%

Non family 27.7%

% family households

St. Clair County 72.3%

Alabama 64.5%

United States 64.2%

Average household size

2.63

persons per household

St. Clair County

2.63

Alabama

2.48

United States

2.53

Household & Family COMPOSITION

Households

Percentage of St. Clair County population

	St. Clair County	Alabama	United States
Total households	35,107	1,997,247	129,227,496
Average houshold size	2.63	2.48	2.53
Family households	25,382	1,287,290	82,990,528
Average family size	3.1	3.11	3.14
Married couple family	19,371	920,332	60,637,388
Other families	6,011	366,958	22,353,140
Male householder	1,315	87,023	6,572,819
Female householder	4,696	279,935	15,780,321
Non-family households	9,725	709,957	46,236,968
One-person households	8,494	615,375	37,140,836
Male householder	3,899	273,110	16,871,444
Senior (65+) living alone	1,415	84,581	5,225,110
Female householder	4,595	342,265	20,269,392
Senior (65+) living alone	2,777	170,988	10,089,070
Other living arrangements	1,231	94,582	9,096,132

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

39,247

housing units

St. Clair County 39,247

Alabama 2,337,265

United States 143,775,355

Occupancy status

89.5% occupied

Occupied 89.5%

Vacant 10.5%

vacancy rate

St. Clair County 10.5%

Alabama 14.5%

United States 10.1%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

72.8%

Single family houses

72.8%

Apartments in multi-unit structures

4.8%

Mobile homes

22.1%

Boat, RV, van, etc

0.4%

Median Year Built

1999

Half of houses were built before 1999, and half after.

Historic ∙ 1939 or earlier

1.4%

Postwar & mid-century ∙ 1940 - 1969

Late 20th century ∙ 1970 - 1999

42.9%

Modern ∙ 2000 or later

46.7%

Note: Median year built reflects occupied units only; distribution includes all units.

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	St. Clair County	Alabama	United States
Rooms per unit
Median rooms	6.1	5.9	5.5
1–3 rooms	3.8%	8.4%	15.1%
4–6 rooms	55.5%	54.5%	51.6%
7+ rooms	40.6%	36.9%	33.4%
Bedrooms
No bedroom / studio	0.7%	1.5%	2.9%
1 bedroom	2.1%	6.3%	10.9%
2 bedrooms	17.9%	21.6%	25%
3 bedrooms	53.9%	48.3%	38.7%
4+ bedrooms	25.4%	22.4%	22.4%
At a glance
Median year built	1999	1987	1981
Total housing units	39,247	2,337,265	143,775,355

Occupancy Profile

Who is inside and how they use it

Homeownership

82.6% owners

Renter-occupied 17.4%

Owner-occupied 82.6%

homeownership rate

St. Clair County 82.6%

Alabama 70.2%

United States 65.2%

Average household size

2.63

Owner-occupied

2.6

Renter-occupied

owner-occupied average size

St. Clair County 2.63

Alabama 2.57

United States 2.64

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	St. Clair County	Alabama	United States
Total occupied units	35,107	1,997,247	129,227,496
Year moved in
2020 or later	23.3%	23.9%	24.8%
2010 to 2019	39.7%	38.3%	39.6%
2000 to 2009	19.6%	16.7%	16.4%
1999 or earlier	17.4%	21.1%	19.1%
Occupants per room
1.00 or fewer	98.1%	98.3%	96.6%
1.01 to 1.50	1.7%	1.2%	2.2%
1.51 or more	0.2%	0.5%	1.2%
Vehicles availability
No vehicles	3%	5.4%	8.4%
1 vehicle	24.6%	31.6%	33.1%
2 vehicles	40.5%	36.6%	36.6%
3 or more vehicles	31.9%	26.4%	21.9%
House heating fuel used
Gas	30.2%	31%	51.4%
Electricity	68.4%	67.4%	41.3%
Solar	0%	0%	0.3%
Fuel oil, kerosene etc	0%	0.1%	3.9%
All other fuels	0.9%	0.8%	2%
No fuel used	0.4%	0.7%	1.2%
Selected characteristics
Lacking complete plumbing	0.3%	0.4%	0.4%
Lacking complete kitchen	0.7%	0.7%	0.8%
No telephone service available	0.9%	1%	0.9%

Housing Value

What owner-occupied units are worth

Median home value

$226,300

owner-occupied units

Median value(USD)

St. Clair County

$226,300

Alabama

$209,900

United States

$332,700

Housing Cost Burden

22.2%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

22.2%

Owners without a mortgage

10.3%

Renters

42.5%

Note: Households spending 30% or more of their income on housing costs are considered cost-burdened.

Financial characteristics

Property value and housing costs

Tenure, crowding, and utilities

	St. Clair County	Alabama	United States
Property value
Median Value	$226,300	$209,900	$332,700
Under $100,000	18.4%	22.3%	11.4%
$100,000 - $200,000	22.3%	25.2%	15.8%
$200,000 - $300,000	29.4%	21.7%	17.8%
$300,000 - $500,000	22.6%	20.8%	26.9%
$500,000 - $1,000,000	6.9%	8.3%	20.9%
$1,000,000 and more	0.4%	1.7%	7.1%
Owner-occupied households
With a mortgage	58.1%	54.1%	60.6%
Without a mortgage	41.9%	45.9%	39.4%
Median monthly owner costs
With a mortgage	$1,516	$1,433	$1,963
Without a mortgage	$443	$447	$638
Gross rent
Median rent	$1,084	$1,007	$1,413

Education Profile

How educated is the community and how education pays off

Adults with a college degree

21.4%

of adults 25+ with a bachelor's degree or higher

St. Clair County 21.4%

Alabama 28.4%

United States 35.7%

Adults without a high school diploma

12.2%

of adults (25+) without a high school diploma

St. Clair County 12.2%

Alabama 11.4%

United States 10.4%

School Enrollment

Who is enrolled in school and at what level

School enrollment

20,476

population (age 3+) enrolled in school

Nursery / Preschool

5.5%

K–12

77.7%

College / Undergraduate

14.2%

Graduate / Professional

2.7%

College-going rate (18-24 yr olds)

30.6%

of 18-24-year-olds in college or graduate school

St. Clair County

30.6%

Alabama

42.5%

United States

40.9%

Enrollment & school type

Enrollment levels, college-going rate, and public vs private school split

Population 3+ currently enrolled in a school

	St. Clair County	Alabama	United States
Total enrolled (age 3+)	20,476	1,213,681	80,089,790
Nursery / preschool	5.5%	5.9%	5.7%
K–12	77.7%	67.7%	67.6%
Kindergarten	5.3%	5.1%	5%
Elementary: Grades 1–4	21.5%	19.8%	19.8%
Elementary: Grades 5–8	25%	21.1%	21%
High School: Grades 9–12	25.8%	21.7%	21.7%
College or graduate school	16.8%	26.4%	26.7%
College, undergraduate	14.2%	21.4%	21%
Graduate, professional school	2.7%	5%	5.8%
College-going rate · 18-24 yr olds	30.6%	42.5%	40.9%
School type
Public school	83.5%	83.6%	82%
Private school	16.5%	16.4%	18%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

66,307

population 25 years and over

Total adults (25+)

Less than 9th grade

4.1%

9th-12th, no diploma

8.1%

HS graduate

34%

Some college no degree

23.1%

Associates degree

9.3%

Bachelors degree

14.4%

Graduate or professional degree

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

61.8% · 38.2%

9th-12th, no diploma

53.8% · 46.2%

HS graduate

50.5% · 49.5%

Some college no degree

49.7% · 50.3%

Associates degree

41.4% · 58.6%

Bachelors degree

44.5% · 55.5%

Graduate or professional degree

37.6% · 62.4%

Educational Attainment Overview

Distribution and key education attainment rates for adults (25+)

Highest credential completed · adults 25+

	St. Clair County	Alabama	United States
Population (25+)	66,307	3,473,706	230,807,303
Less than 9th grade	4.1%	3.6%	4.7%
9th–12th, no diploma	8.1%	7.8%	5.7%
High school diploma or GED	34%	30.3%	26%
Some college, no degree	23.1%	20.8%	19.1%
Associate's degree	9.3%	9.1%	8.8%
Bachelor's degree or higher	21.4%	28.4%	35.7%
Bachelor's degree	14.4%	17.3%	21.6%
Graduate or professional	7%	11.1%	14.1%
High School or higher	87.8%	88.6%	89.6%

Earnings by education level

percentage as applicable

Median Earnings

$50,509

Median earnings for adults 25+, by level

Less than HS graduate

$31,986

HS graduate

$43,963

Some college or associates

$50,792

Bachelors degree

$61,801

Graduate or professional degree

$75,294

Poverty Rate

3.4%

for ages 25+, with bachelors degree or higher

Less than HS graduate

20.1%

HS graduate

12.9%

Some college or associates

5.9%

Bachelors degree or higher

3.4%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	St. Clair County	Alabama	United States
Median earnings
Population 25+, with earnings	$50,509	$46,831	$52,696
Less than high school graduate	$31,986	$30,696	$32,485
High school graduate (includes equivalency)	$43,963	$37,156	$40,153
Some college or associate's degree	$50,792	$43,231	$47,260
Bachelor's degree	$61,801	$61,115	$70,044
Graduate or professional degree	$75,294	$75,030	$90,720
Poverty rates
Less than high school graduate	20.1%	28.8%	24.2%
High school graduate (includes equivalency)	12.9%	16.1%	14.4%
Some college or associate's degree	5.9%	11.4%	9.8%
Bachelor's degree or higher	3.4%	4.7%	4.5%

Insights for St. Clair County, by topic

Income By year By race By age By gender

Population By year By race By age By gender

About Neilsberg Research

Neilsberg Research team are data scientists with expertise in processing, analysis and visualization of big data helping small businesses make right decisions.

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