O'Brien County, Iowa Population 2021

O'Brien County, Iowa's estimated population is 13,663 with a growth rate of -0.33% in the past year according to the most recent United States census data. O'Brien County, Iowa is the 57th largest county inIowa. The 2010 Population was 14,408 and has seen a growth of -5.17% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Annual Growth Rate
202113,663-45-0.33%
202013,708-45-0.33%
201913,753-45-0.33%
201813,798240.17%
201713,774-152-1.09%
201613,9260.00%
201513,926-116-0.83%
201414,042-3-0.02%
201314,045-111-0.78%
201214,156-62-0.44%
201114,218-190-1.32%
201014,408-1,036-6.71%
199015,444-1,528-9.00%
198016,972-550-3.14%
197017,522-1,318-7.00%
196018,840-130-0.69%
195018,970-323-1.67%
194019,2938844.80%
193018,409-642-3.37%
192019,0511,78910.36%
191017,2622771.63%
190016,9853,92530.05%
189013,0608,905214.32%
18804,1553,440481.12%
18707157078837.50%
186080.00%
2021 Growth Rate
-0.33% (-45)
County Website
State
Founded
1851
County Seat
2010 Population
14,408
Growth Since 2010
-5.17% (-745)
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O'Brien County, Iowa Population Growth

Population by Race

Race Population Percentage
White13,25095.77%
Black or African American1751.26%
Two or More Races1401.01%
Asian1320.95%
Some Other Race1030.74%
American Indian and Alaska Native310.22%
Native Hawaiian and Other Pacific Islander40.03%
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O'Brien County, Iowa Population by Race

O'Brien County, Iowa Population Pyramid $2021

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O'Brien County, Iowa Median Age

41.9


Total

40.9


Male

43.4


Female

O'Brien County, Iowa Adults

There are 10,556 adults, (2,836 of whom are seniors) in O'Brien County, Iowa.

O'Brien County, Iowa Age Dependency

79.2

Age Dependency Ratio

36.7

Old Age Dependency Ratio

42.5

Child Dependency Ratio

O'Brien County, Iowa Sex Ratio

Female

6,990

50.52%

Male

6,845

49.48%

O'Brien County, Iowa Population by Age

O'Brien County, Iowa Renter vs Owner Occupied by Household Type

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O'Brien County, Iowa Household Types

Type Owner Renter
Female50.3%49.7%
Non Family50.4%49.6%
All71.7%28.3%
Male76.8%23.2%
Married90.8%9.2%

71.7%

Rate of Home Ownership

O'Brien County, Iowa Households and Families

Type Count Average Size Owned
All6,1692.1871.7
Married3,1332.8590.8
Non Family2,5191.1850.4
Female3403.1150.3
Male1772.7176.8

2.79

Average Family Size

2.18

Average Household Size

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O'Brien County, Iowa Households by Type

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Education Attained Count Percentage
Less Than 9th Grade2602.71%
9th to 12th Grade4925.14%
High School Graduate3,82339.91%
Some College1,88119.64%
Associates Degree1,32413.82%
Bachelors Degree1,35214.12%
Graduate Degree4464.66%
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O'Brien County, Iowa Educational Attainment by Sex (over 25)

O'Brien County, Iowa Educational Attainment by Race

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Race Total High School Bachelors
White9,0158,3101,728
Hispanic34430717
Asian999614
Black939338
Other Race57413
2+ Races5147
Native American24202
Islander333

The highest rate of high school graduation is among black people with a rate of 100.00%.

The highest rate of bachelors degrees is among islander people with a rate of 100.00%.

O'Brien County, Iowa Educational Attainment by Race

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Name Average Male Female
Overall$37,742$46,550$25,244
Less Than 9th Grade$27,228$35,625$16,250
High School Graduate$30,713$41,536$20,394
Some College$37,089$46,188$27,215
Bachelors Degree$50,379$63,011$40,682
Graduate Degree$75,750$78,261$63,173

$37,742

Average Earnings

$46,550

Average Male

$25,244

Average Female

O'Brien County, Iowa Earnings by Educational Attainment

O'Brien County, Iowa Language by Age

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O'Brien County, Iowa Language

94.71% of O'Brien County, Iowa residents speak only English, while 5.29% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 3.96% of the population.

O'Brien County, Iowa Language

O'Brien County, Iowa Poverty by Race

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Name Total In Poverty Poverty Rate
White12,5021,26710.13%
Hispanic6619314.07%
Asian1325340.15%
Black1612414.91%
Other911617.58%
Native311548.39%
Multiple12897.03%

10.67%

Overall Poverty Rate

9.33%

Male Poverty Rate

12.00%

Female Poverty Rate

Poverty in O'Brien County, Iowa

The race most likely to be in poverty in O'Brien County, Iowa is Native, with 48.39% below the poverty level.

The race least likely to be in poverty in O'Brien County, Iowa is Multiple, with 7.03% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.49%. Among those working part-time, it was 17.22%, and for those that did not work, the poverty rate was 15.30%.

O'Brien County, Iowa Poverty

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Name Poverty
Less Than 9th Grade16.41%
High School11.78%
Some College6.05%
Bachelors or Greater3.62%

O'Brien County, Iowa Poverty Rate by Education

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Rate Poverty
Female Unemployed15.94%
Male Unemployed10.00%
Female Employed8.43%
Male Employed7.00%

O'Brien County, Iowa Poverty Rate by Employment Status and Sex

O'Brien County, Iowa Income by Household Type

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Name Median Mean
Households$53,703$67,826
Families$72,361$85,180
Married Families$79,390-
Non Families$31,362$39,785
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Income by Household Type

O'Brien County, Iowa Marital Status

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Marriage Rates

57.3%

Overall Marriage Rate

59.6%

Male Marriage Rate

55.0%

Female Marriage Rate

O'Brien County, Iowa Married by Age and Sex

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O'Brien County, Iowa Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

O'Brien County, Iowa Marital Status by Race

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O'Brien County, Iowa Marital Status

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924

Number of Veterans

873

Male Veterans

51

Female Veterans

War Veterans
Vietnam353
Korea147
Second Gulf War94
First Gulf War89
World War II77

O'Brien County, Iowa Veterans by War

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Age Group Veterans
75+314
65 to 74308
35 to 54152
55 to 6486
18 to 3464

O'Brien County, Iowa Veterans by Age

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Name Veterans % of Total
White8768.58%
Hispanic4813.33%
2+ Races2850.91%
Black1212.63%
Islander375.00%
Native American312.50%
Other Race23.08%

O'Brien County, Iowa Veterans by Race

O'Brien County, Iowa Veterans by Education

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0.44%

Veteran Poverty Rate

33.08%

Veteran Disability Rate

O'Brien County, Iowa Veterans by Education

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67.2%

Labor Force Participation

65.9%

Employment Rate

1.9%

Unemployment Rate

O'Brien County, Iowa Employment by Age

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O'Brien County, Iowa Employment by Race

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O'Brien County, Iowa Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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76.91%

Born in O'Brien County, Iowa

96.86%

Native Born

3.14%

Foreign Born

1.19%

Non Citizen

1.94%

Naturalized

Place of Birth

96.86% of O'Brien County, Iowa residents were born in the United States, with 76.91% having been born in Iowa. 1.19% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

O'Brien County, Iowa Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources