Clinton County, Iowa

County in IA, US

By Neilsberg Research

Last updated May 1, 2026

Key Indicators

A quick look at key numbers

Population

46,268

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

Median Age

42.4

years ∙ half population younger than 42.4, half older

Diversity Index

20.4%

chance two random people differ in race and ethnicity

Nativity

foreign-born population

98%Native

2% Foreign-born

Geographic Context

Location, size, and surroundings

About

Clinton County is a county in Iowa, United States.

Location

County in IA, US

Co-ordinates

DEC41.898073° N, 90.534243° W

DMS41° 53′ 53.06″ N, 90° 32′ 03.27″ W

Population Density & area

66.57/sq mi (25.71/km²)

Total Area

710.2 sq mi (1,839.3 km²)

Land Area

695 sq mi (1,799.9 km²) · 97.9%

Water Area

15.2 sq mi (39.4 km²) · 2.1%

Demographics & Living

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

Population Composition

Key characteristics of the population

Sex Distribution

49.3% male

Male 49.3%

Female 50.7%

males per 100 females

Clinton County 97.4

Iowa 100.6

United States 98

Nativity

foreign-born population

98%Native

2% Foreign-born

% Foreign-born

Clinton County 2%

Iowa 5.9%

United States 14.1%

Age Distribution

How the population is spread across age groups

Median Age

42.4

years ∙ half population younger than 42.4, half older

Clinton County

42.4

Iowa

38.6

United States

38.9

Dependency ratio

75.9

dependents per 100 working-age adults

Clinton County 75.9

Iowa 69.6

United States 64.4

AGE DISTRIBUTION

Distribution of age group

Median age

	Clinton County	Iowa	United States
Age Group
Children (Under 18)	22.9%	22.9%	22%
Working age (18-64)	56.8%	59%	60.8%
Senior (65+)	20.3%	18.1%	17.2%
Dependency ratio
Total dependency ratio	75.9	69.6	64.4
Child dependency ratio	40.2	38.8	36.1
Old-age dependency ratio	35.6	30.7	28.3

Racial & Ethnic Composition

Racial and ethnic makeup and how it compares

Race & Ethnicity

White

89%

Black

3.1%

Asian

0.7%

Hispanic

3.6%

Other

3.6%

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

20.4%

chance two random people differ in race and ethnicity

Clinton County 20.4%

Iowa 31.4%

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 Clinton County population

	Clinton County	Iowa	United States
Hispanic or Latino	3.6%	7.3%	19.3%
Mexican	2%	5%	11.3%
Puerto Rican	0.6%	0.3%	1.8%
Cuban	0.1%	0.1%	0.8%
Other Hispanic / Latino	1%	1.8%	5.5%
Not Hispanic or Latino	96.4%	92.7%	80.7%
One race	93%	89.2%	76.4%
White	89%	82.3%	57.4%
Black or African American	3.1%	3.8%	11.9%
American Indian and Alaska Native	0.1%	0.2%	0.5%
Asian	0.7%	2.5%	5.9%
Native Hawaiian and Other Pacific Islander	0%	0.2%	0.2%
Some Other Race	0.1%	0.3%	0.6%
Two or more races (Multiracial)	3.4%	3.5%	4.3%

Household & Families Composition

Household size, type, and family structure

Household structure

62% family

Family 62%

Non family 38%

% family households

Clinton County 62%

Iowa 61.6%

United States 64.2%

Average household size

2.34

persons per household

Clinton County

2.34

Iowa

2.36

United States

2.53

Household & Family COMPOSITION

Households

Percentage of Clinton County population

	Clinton County	Iowa	United States
Total households	19,506	1,315,707	129,227,496
Average houshold size	2.34	2.36	2.53
Family households	12,088	809,836	82,990,528
Average family size	2.92	2.98	3.14
Married couple family	9,156	635,347	60,637,388
Other families	2,932	174,489	22,353,140
Male householder	1,105	56,457	6,572,819
Female householder	1,827	118,032	15,780,321
Non-family households	7,418	505,871	46,236,968
One-person households	6,228	406,436	37,140,836
Male householder	2,881	193,582	16,871,444
Senior (65+) living alone	1,053	58,028	5,225,110
Female householder	3,347	212,854	20,269,392
Senior (65+) living alone	1,803	111,645	10,089,070
Other living arrangements	1,190	99,435	9,096,132

Housing Profile

Housing stock, ownership, rentals, and cost burdens

Total housing units

21,581

housing units

Clinton County 21,581

Iowa 1,437,699

United States 143,775,355

Occupancy status

90.4% occupied

Occupied 90.4%

Vacant 9.6%

vacancy rate

Clinton County 9.6%

Iowa 8.5%

United States 10.1%

Housing Characteristics

How the housing supply is structured and used

Types of Housing unit

81.2%

Single family houses

81.2%

Apartments in multi-unit structures

17.2%

Mobile homes

1.7%

Boat, RV, van, etc

Median Year Built

1960

Half of houses were built before 1960, and half after.

Historic ∙ 1939 or earlier

36%

Postwar & mid-century ∙ 1940 - 1969

26.9%

Late 20th century ∙ 1970 - 1999

25.1%

Modern ∙ 2000 or later

11.9%

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

Housing Characteristics

Units, rooms & bedrooms

Physical characteristics of housing units

	Clinton County	Iowa	United States
Rooms per unit
Median rooms	6	5.9	5.5
1–3 rooms	10.8%	11.8%	15.1%
4–6 rooms	48.6%	47.4%	51.6%
7+ rooms	40.6%	40.7%	33.4%
Bedrooms
No bedroom / studio	1.6%	1.7%	2.9%
1 bedroom	10%	9.2%	10.9%
2 bedrooms	26.3%	27%	25%
3 bedrooms	41.1%	37.3%	38.7%
4+ bedrooms	21.1%	24.7%	22.4%
At a glance
Median year built	1960	1972	1981
Total housing units	21,581	1,437,699	143,775,355

Occupancy Profile

Who is inside and how they use it

Homeownership

74.5% owners

Renter-occupied 25.5%

Owner-occupied 74.5%

homeownership rate

Clinton County 74.5%

Iowa 71.7%

United States 65.2%

Average household size

2.44

Owner-occupied

2.03

Renter-occupied

owner-occupied average size

Clinton County 2.44

Iowa 2.5

United States 2.64

Housing Characteristics

Occupied unit characteristics

Tenure, crowding, and utilities

	Clinton County	Iowa	United States
Total occupied units	19,506	1,315,707	129,227,496
Year moved in
2020 or later	23.5%	24.3%	24.8%
2010 to 2019	35.1%	38.7%	39.6%
2000 to 2009	17.4%	16.4%	16.4%
1999 or earlier	24.1%	20.7%	19.1%
Occupants per room
1.00 or fewer	99.4%	98.4%	96.6%
1.01 to 1.50	0.5%	1.1%	2.2%
1.51 or more	0%	0.5%	1.2%
Vehicles availability
No vehicles	7.2%	5.4%	8.4%
1 vehicle	30.7%	30.5%	33.1%
2 vehicles	33.7%	37.8%	36.6%
3 or more vehicles	28.4%	26.3%	21.9%
House heating fuel used
Gas	80.1%	72.8%	51.4%
Electricity	16.5%	24.4%	41.3%
Solar	0%	0.1%	0.3%
Fuel oil, kerosene etc	0.6%	0.3%	3.9%
All other fuels	2.1%	1.8%	2%
No fuel used	0.7%	0.6%	1.2%
Selected characteristics
Lacking complete plumbing	0.4%	0.3%	0.4%
Lacking complete kitchen	0.6%	0.8%	0.8%
No telephone service available	1.5%	0.8%	0.9%

Housing Value

What owner-occupied units are worth

Median home value

$160,600

owner-occupied units

Median value(USD)

Clinton County

$160,600

Iowa

$208,000

United States

$332,700

Housing Cost Burden

19.7%

of homeowners with a mortgage are cost-burdened

% Cost-Burdened Households

Owners with a mortgage

19.7%

Owners without a mortgage

10.9%

Renters

47.6%

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

	Clinton County	Iowa	United States
Property value
Median Value	$160,600	$208,000	$332,700
Under $100,000	26.4%	17.8%	11.4%
$100,000 - $200,000	36.3%	30%	15.8%
$200,000 - $300,000	19.8%	23.1%	17.8%
$300,000 - $500,000	13.6%	21.3%	26.9%
$500,000 - $1,000,000	3.3%	6.8%	20.9%
$1,000,000 and more	0.6%	1.1%	7.1%
Owner-occupied households
With a mortgage	57.8%	59.4%	60.6%
Without a mortgage	42.2%	40.6%	39.4%
Median monthly owner costs
With a mortgage	$1,334	$1,533	$1,963
Without a mortgage	$593	$616	$638
Gross rent
Median rent	$850	$972	$1,413

Education Profile

How educated is the community and how education pays off

Adults with a college degree

22.4%

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

Clinton County 22.4%

Iowa 31.4%

United States 35.7%

Adults without a high school diploma

6.6%

of adults (25+) without a high school diploma

Clinton County 6.6%

Iowa 6.7%

United States 10.4%

School Enrollment

Who is enrolled in school and at what level

School enrollment

9,772

population (age 3+) enrolled in school

Nursery / Preschool

4.6%

K–12

82.9%

College / Undergraduate

9.9%

Graduate / Professional

2.5%

College-going rate (18-24 yr olds)

21.6%

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

Clinton County

21.6%

Iowa

42.3%

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

	Clinton County	Iowa	United States
Total enrolled (age 3+)	9,772	784,322	80,089,790
Nursery / preschool	4.6%	6.2%	5.7%
K–12	82.9%	68.4%	67.6%
Kindergarten	6.9%	5.2%	5%
Elementary: Grades 1–4	24.4%	20.3%	19.8%
Elementary: Grades 5–8	26.6%	21.3%	21%
High School: Grades 9–12	25%	21.6%	21.7%
College or graduate school	12.5%	25.4%	26.7%
College, undergraduate	9.9%	20.8%	21%
Graduate, professional school	2.5%	4.6%	5.8%
College-going rate · 18-24 yr olds	21.6%	42.3%	40.9%
School type
Public school	90%	84.4%	82%
Private school	10%	15.6%	18%

Education Attainment by Level & Gender

What is the highest level of education completed among adults

Education attainment

32,266

population 25 years and over

Total adults (25+)

Less than 9th grade

1.3%

9th-12th, no diploma

5.3%

HS graduate

35.7%

Some college no degree

22.1%

Associates degree

13.1%

Bachelors degree

15.4%

Graduate or professional degree

Attainment by gender

Male vs Female

Adults (25+) · Share within each education level

% male · % female

Less than 9th grade

50.9% · 49.1%

9th-12th, no diploma

56% · 44%

HS graduate

52.2% · 47.8%

Some college no degree

47.7% · 52.3%

Associates degree

49.7% · 50.3%

Bachelors degree

41.5% · 58.5%

Graduate or professional degree

41.5% · 58.5%

Educational Attainment Overview

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

Highest credential completed · adults 25+

	Clinton County	Iowa	United States
Population (25+)	32,266	2,154,149	230,807,303
Less than 9th grade	1.3%	2.7%	4.7%
9th–12th, no diploma	5.3%	4%	5.7%
High school diploma or GED	35.7%	30%	26%
Some college, no degree	22.1%	19.7%	19.1%
Associate's degree	13.1%	12.1%	8.8%
Bachelor's degree or higher	22.4%	31.4%	35.7%
Bachelor's degree	15.4%	20.9%	21.6%
Graduate or professional	7%	10.5%	14.1%
High School or higher	93.3%	93.3%	89.6%

Earnings by education level

percentage as applicable

Median Earnings

$48,894

Median earnings for adults 25+, by level

Less than HS graduate

$33,750

HS graduate

$41,854

Some college or associates

$49,443

Bachelors degree

$52,648

Graduate or professional degree

$81,262

Poverty Rate

3.9%

for ages 25+, with bachelors degree or higher

Less than HS graduate

36.9%

HS graduate

14.1%

Some college or associates

Bachelors degree or higher

3.9%

Outcomes by Education Level

Earnings and poverty rates across education levels (25+)

Adults 25+

	Clinton County	Iowa	United States
Median earnings
Population 25+, with earnings	$48,894	$51,106	$52,696
Less than high school graduate	$33,750	$35,996	$32,485
High school graduate (includes equivalency)	$41,854	$41,528	$40,153
Some college or associate's degree	$49,443	$47,635	$47,260
Bachelor's degree	$52,648	$62,744	$70,044
Graduate or professional degree	$81,262	$80,022	$90,720
Poverty rates
Less than high school graduate	36.9%	21.5%	24.2%
High school graduate (includes equivalency)	14.1%	12.4%	14.4%
Some college or associate's degree	9%	8.1%	9.8%
Bachelor's degree or higher	3.9%	3.8%	4.5%

Insights for Clinton 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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