Polk County, Iowa Population 2021

Polk County, Iowa's estimated population is 498,817 with a growth rate of 0.88% in the past year according to the most recent United States census data. Polk County, Iowa is the null largest county in Iowa. The 2010 Population was 432,352 and has seen a growth of 15.37% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
2021498,8174,3280.88%
2020494,4894,3280.88%
2019490,1614,3280.89%
2018485,8335,3461.11%
2017480,4876,2101.31%
2016474,2776,9731.49%
2015467,3046,4061.39%
2014460,8988,2411.82%
2013452,6577,9861.80%
2012444,6715,9341.35%
2011438,7376,3851.48%
2010432,352105,21232.16%
1990327,14023,9707.91%
1980303,17017,0695.97%
1970286,10119,7867.43%
1960266,31540,30517.83%
1950226,01030,17515.41%
1940195,83522,99813.31%
1930172,83718,80812.21%
1920154,02943,59139.47%
1910110,43827,81433.66%
190082,62417,21426.32%
189065,41023,01554.29%
188042,39514,53852.19%
187027,85716,232139.63%
186011,6257,112157.59%
18504,5130.00%
2021 Growth Rate
0.88%
County Website
State
Founded
1846
County Seat
2010 Population
432,352
Growth Since 2010
15.37%
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Polk County, Iowa Population Growth

Population by Race

Race Population Percentage
White402,98784.02%
Black or African American32,5186.78%
Asian21,9094.57%
Two or More Races13,7742.87%
Some Other Race6,4561.35%
American Indian and Alaska Native1,5300.32%
Native Hawaiian and Other Pacific Islander4380.09%
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Polk County, Iowa Population By Race

Polk County, Iowa Population Pyramid 2021

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Polk County, Iowa Median Age

35.5


Total

34.7


Male

36.3


Female

Polk County, Iowa Adults

There are 359,784 adults, (61,222 of whom are seniors) in Polk County, Iowa.

Polk County, Iowa Age Dependency

60.6

Age Dependency Ratio

20.5

Old Age Dependency Ratio

40.1

Child Dependency Ratio

Polk County, Iowa Sex Ratio

Mujer

243,269

50.72%

Masculino

236,343

49.28%

Polk County, Iowa Population by Age

Polk County, Iowa Renter vs Owner Occupied by Household Type

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Polk County, Iowa Household Types

Type Owner Renter
Married85.5%14.5%
All67.1%32.9%
Masculino63.9%36.1%
Non Family50.4%49.6%
Mujer48.5%51.5%

67.1%

Rate of Home Ownership

Polk County, Iowa Households and Families

Type Count Average Size Owned
All187,7982.5167.1
Married87,2853.1885.5
Non Family70,3511.350.4
Mujer21,5543.3948.5
Masculino8,6083.2963.9

3.13

Average Family Size

2.51

Average Household Size

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Polk County, Iowa Households by Type

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Education Attained Count Percentage
Less Than 9th Grade11,9423.75%
9th to 12th Grade15,0254.72%
High School Graduate77,80224.46%
Some College64,94220.42%
Associates Degree31,5729.93%
Bachelors Degree81,07925.49%
Graduate Degree35,67011.22%
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Polk County, Iowa Educational Attainment by Sex (over 25)

Polk County, Iowa Educational Attainment by Race

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Race Total High School Bachelors
White263,331251,067105,187
Hispanic18,94811,6112,276
Black17,98115,1433,478
Asian13,8689,7464,428
2+ Races3,9763,4201,313
Other Race3,4261,796289
Native American860674153
Islander276212103

The highest rate of high school graduation is among white people with a rate of 95.34%.

The highest rate of bachelors degrees is among white people with a rate of 39.94%.

Polk County, Iowa Educational Attainment by Race

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Name Average Masculino Mujer
Overall$44,147$51,492$37,320
Less Than 9th Grade$27,165$31,801$21,821
High School Graduate$33,048$39,916$25,390
Some College$39,524$46,166$32,373
Bachelors Degree$57,984$67,151$48,813
Graduate Degree$72,242$84,158$65,120

$44,147

Average Earnings

$51,492

Average Male

$37,320

Average Female

Polk County, Iowa Earnings by Educational Attainment

Polk County, Iowa Language by Age

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Polk County, Iowa Language

86.71% of Polk County, Iowa residents speak only English, while 13.29% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 5.72% of the population.

Polk County, Iowa Language

Polk County, Iowa Poverty by Race

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Name Total In Poverty Poverty Rate
White366,26026,8017.32%
Black31,5298,53327.06%
Hispanic39,5188,35821.15%
Multiple13,4253,38625.22%
Asian21,7582,55411.74%
Other6,4051,31820.58%
Native1,44620514.18%
Islander43816136.76%

10.40%

Overall Poverty Rate

9.54%

Male Poverty Rate

11.23%

Female Poverty Rate

Poverty in Polk County, Iowa

The race most likely to be in poverty in Polk County, Iowa is Islander, with 36.76% below the poverty level.

The race least likely to be in poverty in Polk County, Iowa is White, with 7.32% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.09%. Among those working part-time, it was 16.13%, and for those that did not work, the poverty rate was 18.87%.

Polk County, Iowa Poverty

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Name Poverty
Less Than 9th Grade21.44%
High School11.25%
Some College8.05%
Bachelors or Greater2.81%

Polk County, Iowa Poverty Rate by Education

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Name Poverty
Female Unemployed41.49%
Male Unemployed22.24%
Female Employed6.48%
Male Employed4.20%

Polk County, Iowa Poverty Rate by Employment Status and Sex

Polk County, Iowa Income by Household Type

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Name Median Mean
Households$67,637$88,311
Families$83,465$105,443
Married Families$99,958$122,487
Non Families$43,234$55,507
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Income by Household Type

Polk County, Iowa Marital Status

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Marriage Rates

48.9%

Overall Marriage Rate

50.5%

Male Marriage Rate

47.3%

Female Marriage Rate

Polk County, Iowa Married by Age and Sex

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Polk 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.

Polk County, Iowa Marital Status by Race

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Polk County, Iowa Marital Status

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23,447

Number of Veterans

22,000

Male Veterans

1,447

Female Veterans

War Veterans
Vietnam7,870
Second Gulf War4,665
First Gulf War4,470
Korea1,824
World War II976

Polk County, Iowa Veterans by War

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Age Group Veterans
35 to 545,870
65 to 745,649
75+5,349
55 to 644,141
18 to 342,438

Polk County, Iowa Veterans by Age

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Name Veterans % of Total
White22,0137.09%
Black7603.54%
Hispanic5702.41%
Asian2281.42%
2+ Races1773.07%
Native American13512.15%
Other Race1002.30%
Islander3412.32%

Polk County, Iowa Veterans by Race

Polk County, Iowa Veterans by Education

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6.49%

Veteran Poverty Rate

28.12%

Veteran Disability Rate

Polk County, Iowa Veterans by Education

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72.2%

Labor Force Participation

69%

Employment Rate

4.2%

Unemployment Rate

Polk County, Iowa Employment by Age

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Polk County, Iowa Employment by Race

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Polk 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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68.68%

Born in Polk County, Iowa

90.95%

Native Born

9.05%

Foreign Born

5.22%

Non Citizen

3.83%

Naturalized

Place of Birth

90.95% of Polk County, Iowa residents were born in the United States, with 68.68% having been born in Iowa. 5.22% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Polk 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