98166 ZIP Code, Seattle, WA
98166 is a ZIP code in Seattle, Washington in King County. It covers 5.8 square miles of land. The closest ZIP codes are 98148, 98158 and 98146. 22,082 people live here in 8,961 households. At about 3,823 people per square mile it has suburban density, and owners and renters are mixed (68% own). Median household income is $114,969, above the Washington median of $98,141.
Quick facts
- Mailing city: Seattle, WA
- County: King County
- Land area: 5.8 sq mi
- Population: 22,082
- Median household income: $114,969
- Carrier routes: 16 (9,699 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 22,082 |
| Households | 8,961 |
| Median household income | $114,969 |
| Income per person | $66,945 |
| Median age | 43.6 |
| Homeowners | 67.9% |
| Median home value | $824,400 |
| Median rent | $1,782 |
| Bachelor's degree or higher | 46.9% |
| Average commute (minutes) | 28.5 |
| Households with kids under 18 | 26.6% |
| Moved in the past year | 10.2% |
| Below the poverty line | 10.1% |
| Broadband internet | 94.0% |
| Speak a non-English language at home | 17.2% |
Household income
| % of households | Value |
|---|---|
| <$10K | 2.6% |
| $10–15K | 4.5% |
| $15–25K | 2.1% |
| $25–35K | 4.8% |
| $35–50K | 6.6% |
| $50–75K | 10.1% |
| $75–100K | 12.1% |
| $100–150K | 16.8% |
| $150–200K | 13.2% |
| $200K+ | 27.1% |
Age
| % of all residents | Value |
|---|---|
| <10 | 10.8% |
| 10–19 | 9.8% |
| 20–24 | 3.5% |
| 25–34 | 11.0% |
| 35–44 | 16.9% |
| 45–54 | 12.1% |
| 55–64 | 15.3% |
| 65–74 | 12.0% |
| 75+ | 8.5% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 40.4% |
| Owned outright | 22.0% |
| Rented | 29.0% |
| Vacant | 8.7% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 66.7% |
| Townhome | 2.5% |
| 2–4 units | 4.3% |
| 5–19 units | 13.4% |
| 20+ units | 12.9% |
| Mobile / other | 0.1% |
Businesses in 98166
740 business establishments with 6,025 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 131
- Professional, Scientific, and Technical Services: 97
- Construction: 82
- Accommodation and Food Services: 82
- Other Services (except Public Administration): 76
- Retail Trade: 67
- Real Estate and Rental and Leasing: 47
- Finance and Insurance: 33
EDDM carrier routes
98166 has 16 USPS carrier routes with 9,699 residential and 697 business mailboxes. Open the EDDM route map.
Carrier routes in 98166
98166 has 16 USPS carrier routes (16 city (C)) with 9,699 residential and 697 business mailboxes. Routes range from 428 homes (C075) to 1,105 homes (C034); the median route has 534 homes. The Census counted 8,961 households in 98166 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 0 |
| 250–499 | 4 |
| 500–749 | 10 |
| 750–999 | 1 |
| 1,000–1,499 | 1 |
| 1,500+ | 0 |
Best routes in 98166 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C015 — USPS business mailboxes 208, 491 homes
- Route C034 — USPS business mailboxes 119, 1,105 homes
- Route C025 — USPS business mailboxes 118, 733 homes
- Route C005 — USPS business mailboxes 77, 854 homes
- Route C032 — USPS business mailboxes 61, 615 homes
Select these 5 routes on the route map
Every carrier route in 98166
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C005 | City | 854 | 77 | $162,765 | — | — | — |
| C015 | City | 491 | 208 | $72,173 | — | — | — |
| C016 | City | 649 | 47 | $169,149 | — | — | — |
| C024 | City | 510 | 7 | $75,746 | — | — | — |
| C025 | City | 733 | 118 | $162,765 | — | — | — |
| C026 | City | 534 | 1 | $167,339 | — | — | — |
| C032 | City | 615 | 61 | $108,816 | — | — | — |
| C034 | City | 1,105 | 119 | $72,173 | — | — | — |
| C035 | City | 532 | 16 | $167,553 | — | — | — |
| C036 | City | 517 | 0 | $167,339 | — | — | — |
| C044 | City | 486 | 2 | $121,755 | — | — | — |
| C045 | City | 655 | 14 | $169,149 | — | — | — |
| C054 | City | 533 | 1 | $121,755 | — | — | — |
| C064 | City | 483 | 0 | $121,755 | — | — | — |
| C075 | City | 428 | 24 | $167,339 | — | — | — |
| C084 | City | 574 | 2 | $141,980 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 98166 on the EDDM route map.
How route demographics are estimated
Mailbox counts come from USPS; demographics are estimates
The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).
How a route gets its figures: the block-group length-share method
We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.
Margins of error
Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.
Different years
USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.
Why some routes show identical figures
Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.
Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Nearby ZIP codes
- 98148 — Burien city, WA (1.3 mi)
- 98158 — SeaTac city, WA (2.1 mi)
- 98146 — Burien city, WA (3.4 mi)
- 98168 — Tukwila city, WA (3.6 mi)
- 98188 — Tukwila city, WA (3.8 mi)
- 98198 — Des Moines city, WA (4.5 mi)
- 98178 — Bryn Mawr-Skyway CDP, WA (6 mi)
- 98032 — Kent city, WA (6.1 mi)
Areas that include 98166
- Seattle, WA ZIP codes — 38 ZIP codes
- Burien, WA ZIP codes — 4 ZIP codes
- Normandy Park, WA ZIP codes — 1 ZIP code
- King County ZIP codes — 88 ZIP codes
- Washington ZIP code data
Where it ranks
- No. 9 of 78: highest median age in King County
- No. 4 of 33: highest share of owner-occupied homes in Seattle, WA
- No. 2 of 33: highest median age in Seattle, WA
Mail every home in 98166
Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.
Seattle EDDM mailing
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 98166, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 98166 in?
- 98166 is a Seattle, WA mailing address. By land area, 59% lies inside Burien and 41% lies inside Normandy Park.
- What county is 98166 in?
- 98166 is in King County.
- What is the population of 98166?
- About 22,082 people (±1,234), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 22,152.
- What is the median household income in 98166?
- $114,969 (±$14,438), compared with $98,141 for Washington as a whole. Half the households in the ZIP code earn more and half earn less.
- How many carrier routes and mailboxes are in 98166?
- 16 USPS carrier routes with 9,699 residential and 697 business mailboxes (10,397 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 98166?
- The closest, measured center to center: 98148 (1.3 mi, Burien), 98158 (2.1 mi, SeaTac), 98146 (3.4 mi, Burien), 98168 (3.6 mi, Tukwila), 98188 (3.8 mi, Tukwila) and 98198 (4.5 mi, Des Moines).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.