Polk County, Iowa Population 2020

Polk County, Iowa's estimated population is 481,086 with a growth rate of 1.37% in the past year according to the most recent United States census data. Polk County, Iowa is the largest county in Iowa.

Year Population Growth Growth Rate
2018487,2046,1181.27%
2017481,0866,5071.37%
2016474,5797,0531.51%
2015467,5266,5491.42%
2014460,9778,2901.83%
2013452,6878,0111.80%
2012444,6765,9551.36%
2011438,7216,3591.47%
2010432,362105,22232.16%
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%

How Many People Live in Polk County, Iowa?

481,086

Population by Race

Race Population Percentage
White399,97984.34%
Black or African American31,0766.55%
Asian21,5084.53%
Two or More Races13,6112.87%
Some Other Race6,3121.33%
American Indian and Alaska Native1,3650.29%
Native Hawaiian and Other Pacific Islander4230.09%

Polk County, Iowa Population Pyramid 2020

Polk County, Iowa Median Age

35.3


Total

34.5


Male

36.2


Female

Polk County, Iowa Adults

There are 355,177 adults, (58,939 of whom are seniors) in Polk County, Iowa.

Polk County, Iowa Age Dependency

60.1

Age Dependency Ratio

19.9

Old Age Dependency Ratio

40.2

Child Dependency Ratio

Polk County, Iowa Sex Ratio

Female

240,675

50.75%

Male

233,599

49.25%

Polk County, Iowa Households and Families

Polk County, Iowa Renter vs Owner Occupied by Household Type

Polk County, Iowa Household Types

Type Owner Renter
Married85.6%14.4%
All67.2%32.8%
Male60.5%39.5%
Non Family50.3%49.7%
Female47.6%52.4%

67.2%

Rate of Home Ownership

Type Count Average Size Owned
All183,7532.5367.2
Married87,0173.1985.6
Non Family68,1001.3250.3
Female20,5173.4447.6
Male8,1193.3460.5

3.15

Average Family Size

2.53

Average Household Size

7.5%

Unmarried (Opposite Sex)

0.4%

Unmarried (Same Sex)

Polk County, Iowa Education

Education Attained Count Percentage
Less Than 9th Grade11,3283.61%
9th to 12th Grade15,3254.89%
High School Graduate77,89024.85%
Some College63,90420.39%
Associates Degree31,92010.18%
Bachelors Degree77,51924.73%
Graduate Degree35,59011.35%

Polk County, Iowa Educational Attainment by Race

Name Total High School Bachelors
White260,625248,117101,832
Hispanic18,40211,1642,205
Black17,18814,3633,151
Asian13,5559,8164,837
Multiple Races3,7253,2821,065
Other Race3,4431,812307
Native American754584115
Islander29117989

The highest rate of high school graduation is among white people with a rate of 95.20%.

The highest rate of bachelors degrees is among white people with a rate of 39.07%.

Name Average Male Female
Overall$42,312$50,227$36,264
Less Than High School$26,850$30,931$21,508
High School Grad$31,942$39,622$24,278
Some College$38,400$45,264$31,784
Bachelors Degree$56,280$66,033$47,940
Graduate Degree$70,626$81,992$64,488

$42,312

Average Earnings

$50,227

Average Male

$36,264

Average Female

Polk County, Iowa Language

Polk County, Iowa Language by Age

Polk County, Iowa Language

87.08% of Polk County, Iowa residents speak only English, while 12.92% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 5.60% of the population.

Polk County, Iowa Poverty

Polk County, Iowa Poverty by Race

Name Total In Poverty Poverty Rate
White363,41628,0527.72%
Hispanic38,4699,08423.61%
Black30,1088,51128.27%
Multiple13,2383,43525.95%
Asian21,3552,91613.65%
Other6,2511,44323.08%
Native1,27427521.59%
Islander42313531.91%

11.12%

Overall Poverty Rate

9.79%

Male Poverty Rate

12.40%

Female Poverty Rate

Poverty in Polk County, Iowa

The race most likely to be in poverty in Polk County, Iowa is Islander, with 31.91% below the poverty level.

The race least likely to be in poverty in Polk County, Iowa is White, with 7.72% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.40%. Among those working part-time, it was 16.93%, and for those that did not work, the poverty rate was 19.21%.

Name Poverty
Less Than High School21.98%
High School12.15%
Some College8.10%
Bachelors or Greater3.06%
Name Poverty
Female Unemployed42.47%
Male Unemployed19.97%
Female Employed7.01%
Male Employed4.62%

Polk County, Iowa Income

Polk County, Iowa Income by Household Type

Name Median Mean
Households$66,044$86,637
Families$81,965$103,116
Married Families$97,728$119,722
Non Families$41,595$54,859

Polk County, Iowa Marital Status

Polk County, Iowa Marital Status

Marriage Rates

49.4%

Overall Marriage Rate

50.9%

Male Marriage Rate

47.9%

Female Marriage Rate

Polk County, Iowa Married by Age and Sex

Polk County, Iowa Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 45-54.

Polk County, Iowa Marital Status by Race

Polk County, Iowa Veterans

23,452

Number of Veterans

21,883

Male Veterans

1,569

Female Veterans

War Veterans
Vietnam7,925
First Gulf War4,540
Second Gulf War4,346
Korea2,104
World War II1,131

Polk County, Iowa Veterans by Race

Name Veterans % of Total
White21,9577.15%
Black9864.78%
Hispanic5722.49%
Asian1871.17%
2 or More1102.06%
Other932.14%
Indian868.75%
Hawaiian3311.34%

Polk County, Iowa Veterans by Education

5.06%

Veteran Poverty Rate

27.05%

Veteran Disability Rate

Polk County, Iowa Employment Status

72.3%

Labor Force Participation

69.1%

Employment Rate

4.3%

Unemployment Rate

Polk County, Iowa Place of Birth

Origin of Non Citizens

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

Origin of Naturalized Citizens

68.68%

Born in Iowa

91.03%

Native Born

8.97%

Foreign Born

5.20%

Non Citizen

Place of Birth

91.03% of Polk County, Iowa residents were born in the United States, with 68.68% having been born in Iowa. 5.20% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Population of Cities in Polk County, Iowa

City 2010 Census 2016 Estimated Growth Growth Rate
Des Moines 204190215472112825.53%
West Des Moines 5670364560785713.86%
Ankeny45582586271304528.62%
Urbandale 394594301835599.02%
Johnston1726621114384822.29%
Altoona1454617938339223.32%
Clive 1541217546213413.85%
Grimes 825511909365444.26%
Norwalk 898110590160917.92%
Pleasant Hill8788975096210.95%
Bondurant38605796193650.16%
Windsor Heights486049831232.53%
Polk City34184428101029.55%
Carlisle 389142493589.20%
Mitchellville 225424051516.70%
Granger 1244140215812.70%
Elkhart68378310014.64%
Runnells507523163.16%
Alleman432455235.32%
Sheldahl 31932120.63%
  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