Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

South Prairie, WA Population, Income & Demographics 2026

CSASeattle-Tacoma MSASeattle-Tacoma-Bellevue#40/77 Income

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

309

Median Agei

38.5

Race & Ethnicityi

White

77.3%239

Hispanic/Latino

11.7%36

Two or More

6.8%21

Asian

2.6%8

Native Hawaiian/Pacific Islander

1.6%5

Educational Attainment (Age 25+)i

GED/Alternative

6.7%15

High School Diploma

20%45

Some College (<1 yr)

8.4%19

Some College (1+ yr)

28%63

Associate's Degree

10.7%24

Bachelor's Degree

13.3%30

Master's Degree

3.6%8

HS or Higher

90.7%

BA or Higher

16.9%

Graduate+

3.6%

Housingi

Median Home Valuei

$444,000

Median Renti

—

Tenure

Owner-Occupied

92.9%105

Renter-Occupied

7.1%8

Total Units

121

Homeownership

92.9%

Vacancy Rate

6.6%

Home Values

Under $50K

7.6%8

$150K–$200K

5.7%6

$200K–$300K

2.9%3

$300K–$500K

56.2%59

$500K–$1M

26.7%28

$1M+

1%1

Rent Distribution

$1,000–$1,250

Year Built

2020 or later

4.1%5

2000–2009

12.4%15

1990–1999

10.7%13

1980–1989

19.8%24

1970–1979

5%6

1960–1969

6.6%8

1950–1959

5%6

1939 or earlier

36.4%44

Heating Fuel

Electricity

57.5%65

Wood

28.3%32

Utility Gas

7.1%8

Bottled/LP Gas

4.4%5

Fuel Oil

2.7%3

Economyi

Median Household Incomei

$117,250

Mean Household Incomei

$123,146

Per Capita Incomei

$45,532

Poverty Ratei

2.9%

Unemploymenti

8.2%

Labor Forcei

158

Household Income Distribution

Under $10K

2.7%3

$30K–$35K

1.8%2

$35K–$40K

4.4%5

$40K–$45K

2.7%3

$45K–$50K

5.3%6

$50K–$60K

0.9%1

$75K–$100K

19.5%22

$100K–$125K

18.6%21

$125K–$150K

15.9%18

$150K–$200K

18.6%21

$200K+

9.7%11

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Foreign-Born Populationi

Foreign-Borni

154.9%

By Region

Top Countries

Mexico

Korea

Philippines

Germany

Commute & Transportationi

Workersi

142

Avg. Commutei

36.8 min

How People Get to Work

Travel Time to Work

Workforce

Total Employed

145

Occupations

Industries

Social Characteristicsi

Marital Status (15+)i

Veteransi

34(14.6% of civilian adults)

Health Insurancei

97.4%Insured

2.6%Uninsured