98027 ZIP Code, Issaquah, WA
98027 is a ZIP code in Issaquah, Washington in King County. It covers 57 square miles of land. The closest ZIP codes are 98029, 98050 and 98075. 28,955 people live here in 11,804 households. With about 506 people per square mile it is lightly settled, and owners and renters are mixed (68% own). Median household income is $153,301, well above the Washington median of $98,141.
Quick facts
- Mailing city: Issaquah, WA
- County: King County
- Land area: 57 sq mi
- Population: 28,955
- Median household income: $153,301
- Carrier routes: 20 (12,423 homes)
Key figures
| Measure | Value |
|---|---|
| Residents | 28,955 |
| Households | 11,804 |
| Median household income | $153,301 |
| Income per person | $85,051 |
| Median age | 40.6 |
| Homeowners | 67.6% |
| Median home value | $996,600 |
| Median rent | $2,400 |
| Bachelor's degree or higher | 66.8% |
| Average commute (minutes) | 26 |
| Households with kids under 18 | 27.3% |
| Moved in the past year | 17.6% |
| Below the poverty line | 5.5% |
| Broadband internet | 96.9% |
| Speak a non-English language at home | 20.8% |
Household income
| % of households | Value |
|---|---|
| <$10K | 3.8% |
| $10–15K | 1.3% |
| $15–25K | 2.2% |
| $25–35K | 2.1% |
| $35–50K | 4.3% |
| $50–75K | 9.4% |
| $75–100K | 8.9% |
| $100–150K | 17.4% |
| $150–200K | 13.4% |
| $200K+ | 37.3% |
Age
| % of all residents | Value |
|---|---|
| <10 | 10.3% |
| 10–19 | 10.3% |
| 20–24 | 4.2% |
| 25–34 | 14.9% |
| 35–44 | 16.3% |
| 45–54 | 15.5% |
| 55–64 | 11.9% |
| 65–74 | 9.0% |
| 75+ | 7.6% |
Tenure
| % of housing units | Value |
|---|---|
| Owned, with mortgage | 46.8% |
| Owned outright | 18.3% |
| Rented | 30.8% |
| Vacant | 4.2% |
Type of building
| % of housing units | Value |
|---|---|
| Detached house | 54.7% |
| Townhome | 6.7% |
| 2–4 units | 5.1% |
| 5–19 units | 14.7% |
| 20+ units | 16.5% |
| Mobile / other | 2.2% |
Businesses in 98027
1,268 business establishments with 22,093 employees (ZIP Codes Business Patterns 2023).
- Health Care and Social Assistance: 212
- Professional, Scientific, and Technical Services: 201
- Retail Trade: 116
- Construction: 113
- Accommodation and Food Services: 113
- Other Services (except Public Administration): 101
- Real Estate and Rental and Leasing: 83
- Finance and Insurance: 70
EDDM carrier routes
98027 has 20 USPS carrier routes with 12,423 residential and 1,065 business mailboxes. Open the EDDM route map.
Carrier routes in 98027
98027 has 20 USPS carrier routes (8 city (C), 12 rural (R)) with 12,423 residential and 1,065 business mailboxes. Routes range from 234 homes (C006) to 1,069 homes (C007); the median route has 644 homes. The Census counted 11,804 households in 98027 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.
| Homes per route | Routes |
|---|---|
| 1–249 | 1 |
| 250–499 | 5 |
| 500–749 | 7 |
| 750–999 | 6 |
| 1,000–1,499 | 1 |
| 1,500+ | 0 |
Best routes in 98027 for…
Most businesses
For B2B offers: office supplies, cleaning, IT, catering and commercial services.
- Route C006 — USPS business mailboxes 354, 234 homes
- Route C003 — USPS business mailboxes 341, 331 homes
- Route R007 — USPS business mailboxes 165, 261 homes
- Route C007 — USPS business mailboxes 47, 1,069 homes
- Route C004 — USPS business mailboxes 47, 523 homes
Select these 5 routes on the route map
Every carrier route in 98027
| Route | Type | Homes | Businesses | Est. median income | Est. owners | Est. families with kids | Est. moved in past year |
|---|---|---|---|---|---|---|---|
| C001 | City | 797 | 7 | $113,121 | — | — | — |
| C002 | City | 633 | 5 | $200,001+ | — | — | — |
| C003 | City | 331 | 341 | $113,121 | — | — | — |
| C004 | City | 523 | 47 | $103,328 | — | — | — |
| C005 | City | 676 | 3 | $200,001+ | — | — | — |
| C006 | City | 234 | 354 | $111,614 | — | — | — |
| C007 | City | 1,069 | 47 | $171,508 | — | — | — |
| C008 | City | 452 | 38 | $200,001+ | — | — | — |
| R002 | Rural | 490 | 0 | $154,898 | — | — | — |
| R004 | Rural | 658 | 2 | $184,709 | — | — | — |
| R006 | Rural | 577 | 1 | $200,001+ | — | — | — |
| R007 | Rural | 261 | 165 | $200,001+ | — | — | — |
| R008 | Rural | 830 | 3 | $152,239 | — | — | — |
| R014 | Rural | 825 | 0 | $103,869 | — | — | — |
| R018 | Rural | 654 | 7 | $200,001+ | — | — | — |
| R025 | Rural | 505 | 21 | $200,001+ | — | — | — |
| R026 | Rural | 866 | 2 | $184,709 | — | — | — |
| R028 | Rural | 802 | 2 | $111,614 | — | — | — |
| R032 | Rural | 753 | 1 | $143,222 | — | — | — |
| R034 | Rural | 487 | 19 | $178,699 | — | — | — |
Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 98027 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
- 98029 — Issaquah city, WA (3.1 mi)
- 98050 (3.4 mi)
- 98075 — Sammamish city, WA (5.4 mi)
- 98025 (5.8 mi)
- 98024 — Fall City CDP, WA (6 mi)
- 98059 — East Renton Highlands CDP, WA (6.5 mi)
- 98038 — Hobart CDP, WA (6.7 mi)
- 98006 — Bellevue city, WA (7.9 mi)
Areas that include 98027
- Issaquah, WA ZIP codes — 2 ZIP codes
- East Renton Highlands, WA ZIP codes — 3 ZIP codes
- Mirrormont, WA ZIP codes — 2 ZIP codes
- King County ZIP codes — 88 ZIP codes
- Washington ZIP code data
Where it ranks
- No. 24 of 78: highest share of residents who moved in during the past year in King County
- No. 18 of 78: highest median age in King County
Mail every home in 98027
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.
EDDM guides
ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 98027, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.
Frequently asked questions
- What city is 98027 in?
- 98027 is a Issaquah, WA mailing address. By land area, 15% lies inside Mirrormont, 14% lies inside Issaquah, 2% lies inside East Renton Highlands and 2% lies inside Hobart; the rest is outside any Census-defined city or community.
- What county is 98027 in?
- 98027 is in King County.
- What is the population of 98027?
- About 28,955 people (±1,384), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 29,089.
- What is the median household income in 98027?
- $153,301 (±$15,802), 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 98027?
- 20 USPS carrier routes with 12,423 residential and 1,065 business mailboxes (13,488 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
- What ZIP codes are near 98027?
- The closest, measured center to center: 98029 (3.1 mi, Issaquah), 98050 (3.4 mi), 98075 (5.4 mi, Sammamish), 98025 (5.8 mi), 98024 (6 mi, Fall City) and 98059 (6.5 mi, East Renton Highlands).
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.