SeaTac, Washington Population 2021

28,890
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SeaTac is a city located in Washington. With a 2020 population of 28,890, it is the 40th largest city in Washington and the 1338th largest city in the United States. SeaTac is currently declining at a rate of -0.27% annually but its population has increased by 7.36% since the most recent census, which recorded a population of 26,909 in 2010. SeaTac reached it's highest population of 29,292 in 2017. Spanning over 10 miles, SeaTac has a population density of 2,871 people per square mile.

The average household income in SeaTac is $79,315 with a poverty rate of 12.95%. The median rental costs in recent years comes to $1,286 per month, and the median house value is $321,300. The median age in SeaTac is 35.3 years, 34.4 years for males, and 36.5 years for females. For every 100 females there are 110.4 males.

SeaTac Demographics

According to the most recent ACS, the racial composition of SeaTac was:

  • White: 38.22%
  • Black or African American: 24.86%
  • Asian: 14.06%
  • Other race: 9.52%
  • Two or more races: 7.73%
  • Native Hawaiian or Pacific Islander: 4.76%
  • Native American: 0.85%
The current population of SeaTac, Washington is 28,890, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 29,121.The last official US Census in 2010 recorded the population at 26,909.

SeaTac, Washington Population 2021

Population by Race

Race Population Percentage
White11,09138.22%
Black or African American7,21324.86%
Asian4,08114.06%
Some Other Race2,7629.52%
Two or More Races2,2437.73%
Native Hawaiian and Other Pacific Islander1,3824.76%
American Indian and Alaska Native2470.85%
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SeaTac Population by Race

SeaTac Population Pyramid 2021

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SeaTac Median Age

35.3


Total

34.4


Male

36.5


Female

SeaTac Adults

There are 22,206 adults, (3,480 of whom are seniors) in SeaTac.

SeaTac Age Dependency

55

Age Dependency Ratio

18.6

Old Age Dependency Ratio

36.4

Child Dependency Ratio

SeaTac Sex Ratio

Female

13,790

47.52%

Male

15,229

52.48%

SeaTac Population by Age

SeaTac Renter vs Owner Occupied by Household Type

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SeaTac Household Types

Type Owner Renter
Married63.7%36.3%
All48.8%51.2%
Male44.6%55.4%
Non Family37%63%
Female34.4%65.6%

48.8%

Rate of Home Ownership

SeaTac Households and Families

Type Count Average Size Owned
All9,7472.8748.8
Married4,1653.7963.7
Non Family3,4621.3737
Female1,2733.4934.4
Male8473.5744.6

3.54

Average Family Size

2.87

Average Household Size

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SeaTac Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1,6738.43%
9th to 12th Grade1,2386.24%
High School Graduate5,23326.36%
Some College5,16025.99%
Associates Degree2,08410.50%
Bachelors Degree3,42717.26%
Graduate Degree1,0355.21%
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SeaTac Educational Attainment by Sex (over 25)

SeaTac Educational Attainment by Race

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Name Total High School Bachelors
White7,5947,2271,862
Black4,6723,989916
Asian3,0732,458978
Hispanic2,7371,588331
Other Race1,49984782
Multiple Races1,031914338
Islander77377348
Native American18513244

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

The highest rate of bachelors degrees is among multiple races people with a rate of 32.78%.

SeaTac Educational Attainment by Race

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Name Average Male Female
Overall$35,601$38,482$30,763
Less Than High School$27,768$35,763$24,604
High School Grad$31,253$34,412$29,395
Some College$36,169$39,195$30,555
Bachelors Degree$45,213$48,614$42,976
Graduate Degree$47,326$42,794$48,710

$35,601

Average Earnings

$38,482

Average Male

$30,763

Average Female

SeaTac Earnings by Educational Attainment

SeaTac Language by Age

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SeaTac Language

49.62% of SeaTac residents speak only English, while 50.38% speak other languages. The non-English language spoken by the largest group is Other languages, which is spoken by 15.19% of the population.

SeaTac Language

SeaTac Poverty by Race

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Name Total In Poverty Poverty Rate
Black7,0991,35919.14%
Hispanic4,86287217.94%
White8,9097848.80%
Other2,74366824.35%
Asian3,96741110.36%
Multiple2,17521910.07%
Islander1,382503.62%

12.95%

Overall Poverty Rate

11.85%

Male Poverty Rate

14.13%

Female Poverty Rate

Poverty in SeaTac

The race most likely to be in poverty in SeaTac is Other, with 24.35% below the poverty level.

The race least likely to be in poverty in SeaTac is Islander, with 3.62% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.37%. Among those working part-time, it was 15.94%, and for those that did not work, the poverty rate was 20.39%.

SeaTac Poverty

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Name Poverty
Less Than High School25.10%
High School10.52%
Some College9.24%
Bachelors or Greater4.05%

SeaTac Poverty Rate by Education

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Name Poverty
Male Unemployed22.08%
Female Unemployed15.57%
Male Employed7.46%
Female Employed7.04%

SeaTac Poverty Rate by Employment Status and Sex

SeaTac Income by Household Type

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Name Median Mean
Households$63,009$79,315
Families$80,004$85,934
Married Families$86,479-
Non Families$44,167$58,280
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Income by Household Type

SeaTac Marital Status

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Marriage Rates

43.6%

Overall Marriage Rate

43.1%

Male Marriage Rate

44.2%

Female Marriage Rate

SeaTac Married by Age and Sex

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SeaTac 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 35-44.

SeaTac Marital Status by Race

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SeaTac Marital Status

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1,307

Number of Veterans

1,182

Male Veterans

125

Female Veterans

War Veterans
Vietnam414
First Gulf War264
Second Gulf War236
Korea106
World War II36

SeaTac Veterans by War

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Age Group Veterans
35 to 54331
65 to 74328
55 to 64278
75+256
18 to 34114

SeaTac Veterans by Age

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Name Veterans % of Total
White8709.33%
Black1783.34%
2 or More12710.02%
Asian641.86%
Other281.59%
Hawaiian252.98%
Hispanic240.76%
Indian156.67%

SeaTac Veterans by Race

SeaTac Veterans by Education

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6.05%

Veteran Poverty Rate

25.36%

Veteran Disability Rate

SeaTac Veterans by Education

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70.4%

Labor Force Participation

66.1%

Employment Rate

6%

Unemployment Rate

SeaTac Employment by Age

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SeaTac Employment by Race

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SeaTac 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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37.07%

Born in Washington

61.28%

Native Born

38.72%

Foreign Born

18.98%

Non Citizen

19.74%

Naturalized

Place of Birth

61.28% of SeaTac residents were born in the United States, with 37.07% having been born in Washington. 18.98% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Africa.

SeaTac Place of Birth

Year Population Growth Annual Growth Rate
202128,890-77-0.27%
202028,967-77-0.27%
201929,044-77-0.26%
201829,121-171-0.58%
201729,2921560.54%
201629,1366232.18%
201528,5131700.60%
201428,3432070.74%
201328,1361770.63%
201227,9594111.49%
201127,5485502.04%
201026,9981,5020.57%
200025,4962,6961.12%
199022,8000.00%

SeaTac Population by Year