Interbay, Seattle, WA demographics:
population, income, and more

Total population
8,568
1.2% year-over-year change
Median household income
$152,170/yr
0.9% year-over-year change
Housing units
4,855
2.9% year-over-year change

Interbay population

How many people live in Interbay

Interbay is home to 8,568 residents, according to the most recent Census data. Gender-wise, 49.2% of Interbay locals are male, and 50.8% are female.

Total population
8,568
1.2% year-over-year change
Gender ratio
Male
49.2%
4,213
Female
50.8%
4,355
Value Percent YoY change
Male 4,213 49.2% 1.1%
Female 4,355 50.8% 1.3%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Interbay is 37, with the population distributed as follows: about 11.3% are children under 15, then 12.1% are in the 15 to 24 age group. Adults between 25 and 44 make up 44.3% of the population, while another 19.1% fall into the 45 to 64 bracket. Finally, around 13.2% are 65 or older.

Median age
37
Age breakdown
Under 15
11.3%
15 to 24
12.1%
25 to 44
44.3%
45 to 64
19.1%
Over 65
13.2%
Value Percent YoY change
Under 15 970 11.3% -1.7%
15 to 24 1,035 12.1% -1.2%
25 to 44 3,793 44.3% 2.1%
45 to 64 1,640 19.1% 0.0%
Over 65 1,130 13.2% 4.7%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Interbay, 82.6% of the population are US-born citizens, while 8.6% have gained naturalized citizenship. At the same time, 8.8% of residents are non-citizens. As for race, 69.4% of locals are Caucasian, 2.4% are African American and 13.6% have Asian roots. Another 0.3% are Indigenous American, 0.1% are Pacific Islanders, while 3.1% identify as another race. There’s also a share of 11.1% that includes residents with two or more races.

Citizenship
U.S.-born citizens
82.6%
Non-U.S.-born citizens
8.6%
Non-citizens
8.8%
Value Percent YoY change
U.S.-born citizens 7,075 82.6% -0.4%
Non-U.S.-born citizens 739 8.6% 3.1%
Non-citizens 754 8.8% 16.0%
Racial breakdown
White
69.4%
Black or African American
2.4%
American Indian and Alaska Native
0.3%
Asian
13.6%
Native Hawaiian and other Pacific Islander
0.1%
Two or more races
11.1%
Other
3.1%
Value Percent
White 5,950 69.4%
Black or African American 207 2.4%
American Indian and Alaska Native 26 0.3%
Asian 1,162 13.6%
Native Hawaiian and other Pacific Islander 9 0.1%
Two or more races 949 11.1%
Other 264 3.1%

Households in Interbay

A peek inside Interbay households

Interbay has 4,394 households, with an average of 2 members in each. Of these, 36.7% are families, while the remaining 63.3% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
4,394
2.3% year-over-year change
Average people per household
2
Non-family households
2,780
Family households
1,614
Value Percent YoY change
Non-family households 2,780 63.3% 2.7%
Family households 1,614 36.7% 1.4%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Interbay

The housing landscape of Interbay

Interbay's housing consists of 4,855 units, with 29% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 4.9% and offer a more compact, shared living style.

Housing units
4,855
2.9% year-over-year change
Housing types
Value Percent
1 unit, detached 1,407 29%
1 unit, attached 238 4.9%
2 units 88 1.8%
3 or 4 units 257 5.3%
5 to 9 units 394 8.1%
10 to 19 units 579 11.9%
20 to 49 units 834 17.2%
50 or more units 1,050 21.6%
Boat, RV, van, etc. 8 0.2%
Homes built since 2020
70
100.0% year-over-year change

The age of buildings in Interbay

In Interbay, the median construction year is 1964. About 24.7% of homes were built before the 1940s, with another 7.7% going up by 1949. Most development happened in the second half of the 20th century. Then, 9.5% of homes were added from 2000 to 2009, 13.6% between 2010 and 2019, and 1.4% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 1,197 24.7% -1.6%
Built between 1940 and 1949 374 7.7% 9.0%
Built between 1950 and 1959 479 9.9% 6.9%
Built between 1960 and 1969 523 10.8% -0.4%
Built between 1970 and 1979 420 8.6% 3.2%
Built between 1980 and 1989 361 7.4% 5.2%
Built between 1990 and 1999 310 6.4% 6.5%
Built between 2000 and 2009 462 9.5% -11.5%
Built between 2010 and 2019 658 13.6% 11.7%
Built in 2020 or later 70 1.4% 100.0%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Interbay occupancy rates

Out of the 4,394 occupied housing units in Interbay, 42.8% are owner-occupied, while 57.2% are lived in by tenants. Meanwhile, 9.5% of all homes on the local market sit vacant.

Occupied housing units
4,394
2.3% year-over-year change
Occupancy breakdown
Renter occupied
2,514
Owner occupied
1,880
Value Percent YoY
change
Renter occupied 2,514 57.2% 3.7%
Owner occupied 1,880 42.8% 0.4%
Unoccupied housing units
9.5%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Interbay housing costs

Housing costs in Interbay come to a median of $2,544 per month, while tenants specifically pay a median gross rent of $2,260.

Median housing costs per month
$2,544/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Interbay
$2,260/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Interbay

Interbay education at a glance

About 9.2% of the population in Interbay went to high school, while 14.4% pursued college studies. Another 6.7% earned an associate degree and 41% hold a bachelor’s. Meanwhile, 28.1% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 49 0.7% -2.0%
High school diploma 687 9.2% 4.4%
College diploma 1,075 14.4% -7.8%
Associate degree 497 6.7% 4.4%
Bachelor's degree 3,057 41% 1.0%
Graduate degree 2,098 28.1% 6.2%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Interbay

How much people earn in Interbay

The average annual household income in Interbay was $199,112 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +5.6% change from the previous year. At the same time, the median income stood at $152,170, reflecting a +0.9% shift over the same period.

Average household income in Interbay
$199,112/year
5.7% year-over-year change
Median household income in Interbay
$152,170/year
0.9% year-over-year change

Interbay income by age

In Interbay, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $177,040. Those with someone between 45 and 64 in charge, often well established professionally, earn $165,308 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $97,784, while those led by someone over 65, many of whom may be retired, have about $89,926 in earnings. Overall, 94.1% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $97,784 2.5%
25 - 44 $177,040 3.8%
45 - 64 $165,308 5.1%
Over 65 $89,926 -1.5%
Above poverty level
7,621
Below poverty level
478
Value Percent YoY
change
Above poverty level 7,621 94.1% 2.2%
Below poverty level 478 5.9% -10.5%

Employment in Interbay

Workforce and job types in Interbay

93.7% of the working population are employed in professional or administrative positions, while 6.3% are in hands-on or service-based jobs. Also, 7.9% run their own businesses, 73.8% are employed by private companies, and 8.3% work in the public sector.

Workforce demographics

White collar
5,170
Blue collar
349
Value Percent YoY change
White collar 5,170 93.7% 1.1%
Blue collar 349 6.3% 4.2%
Employer type
Self employees
7.9%
Private companies
73.8%
Governmental workers
8.3%
Not for profit companies
9.9%
Value Percent YoY change
Self employees 437 7.9% 2.8%
Private companies 4,074 73.8% 3.0%
Governmental workers 460 8.3% -3.6%
Not for profit companies 548 9.9% -7.4%

Transportation in Interbay

How people get around in Interbay

Commuting methods vary: 68.3% of residents travel by personal vehicle and 11.6% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 2,353 68.3% 5.7%
Taxicab 6 0.2% -64.7%
Bus or trolleybus 519 15.1% -24.6%
Ferryboat 3 0.1% -70.0%
Motorcycle 5 0.2% N/A
Bicycle 157 4.6% 34.2%
Walk 400 11.6% -8.7%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Interbay by zipcode?

Zipcode Population Number of households Median income Average income
98119 26,879 14,249 $123,551 $186,811
98199 22,468 10,052 $180,789 $232,202

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FAQs about Interbay demographics 

What is the total population of Interbay?

Interbay has a total population of 8,568 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +1.2% compared to a year ago.

What is the gender ratio in Interbay?

The gender ratio in Interbay is as follows:
  • 49.2% males (4,213 residents)
  • 50.8% females (4,355 residents)

What is the median age in Interbay?

The median age in Interbay is 37.

What is the age distribution of the population in Interbay?

The age distribution in Interbay is as follows:
  • Under 15: 11.3% (970 residents)
  • Ages 15-24: 12.1% (1,035 residents)
  • Ages 25-44: 44.3% (3,793 residents)
  • Ages 45-64: 19.1% (1,640 residents)
  • Over 65: 13.2% (1,130 residents)

What is the racial and ethnic makeup of Interbay?

The racial and ethnic makeup of Interbay is as follows:
  • White: 69.4% (5,950 residents)
  • Black or African American: 2.4% (207 residents)
  • American Indian and Alaska Native: 0.3% (26 residents)
  • Asian: 13.6% (1,162 residents)
  • Native Hawaiian and Other Pacific Islander: 0.1% (9 residents)
  • Two or More Races: 11.1% (949 residents)
  • Other: 3.1% (264 residents)

What percentage of the population in Interbay are U.S.-born citizens?

U.S.-born citizens represent 82.6% of the population in Interbay.

How many housing units are there in Interbay?

There are 4,855 housing units in Interbay, reflecting a +2.9% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Interbay and what is the average household size?

Interbay has a total of 4,394 households, with an average of 2 people in each.

What is the median household income in Interbay?

Interbay has a median household income of $152,170, representing a +0.9% shift from the previous year, according to the U.S. Census Bureau.

What is the job market overview for Interbay?

Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 93.7% (5,170 residents)
  • Blue-collar workers: 6.3% (349 residents)

Places of employment:
  • Self-employed: 7.9% (437 residents)
  • Private companies: 73.8% (4,074 residents)
  • Governmental workers: 8.3% (460 residents)
  • Not-for-profit companies: 9.9% (548 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025