Residential delivery area · Washington
ZIP Code 98038: Maple Valley, WA
ZIP code 98038 uses the postal name Maple Valley, Washington and lies entirely in King County (Census 2020 ZIP-county file). About 37,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $152,261 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Hobart (26%), Maple Valley (9%) and Shadow Lake (5%), and 7% in smaller places; 53% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Maple Valley · its only residential ZIP
- County
- King County
- Census places
- Hobart (26%) census-designated place; Maple Valley (9%); Shadow Lake (5%) census-designated place
- Metro area
- Seattle-Tacoma-Bellevue, WA
- House district
- WA-8 119th Congress
- State
- Washington
- Time zone
- Pacific
- Land area
- 65.8 sq mi · 567 people per sq mi
Where is ZIP code 98038?
98038 centers on 47.419°, -121.958° and covers 65.8 square miles of land plus 0.4 of water. It borders 10 ZIP codes: 98025, 98051, 98027, 98010, 98058, 98042, 98059, 98045, 98065, 98022.
The map draws ZIP code areas only. For the streets inside 98038, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 98038 compare with the rest of King County?
| Measure | 98038 | In King County | In WA |
|---|---|---|---|
| People (ACS 2020-2024) | 37,324 | 25th of 89 | 61st of 605 |
| Median household income | $152k | 26th of 78 | 30th of 363 |
| Median home value | $777k | 51st of 78 | 66th of 392 |
Its median household income is higher than in 96% of U.S. residential ZIP codes, and it is denser than 73% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 98038?
The 2020 Census counted 37,487 people in 98038; the ACS, which samples households over 2020-2024, estimates 37,324. Between the 2010 and 2020 censuses its population grew 20.3% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 37,324
- 2020 Census count
- 37,487+20.3% since 2010 (31,171)
- Households
- 12,618
- Median age
- 38.5
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 98038?
Of the 37,324 people the ACS estimates in 98038, 28.9% are under 18 and 12.0% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (69.7%), then Asian (not Hispanic) (12.7%).
- Under 1828.9%
- 18 to 6459.1%
- 65 and older12.0%
- White, not Hispanic69.7%
- Asian, not Hispanic12.7%
- Other or two or more9.6%
- Hispanic or Latino6.7%
- Black, not Hispanic1.3%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 98038 earn?
Median household income is $152,261 (ACS 2020-2024), the 26th highest of the 78 ranked ZIP codes in King County. It rose from $137,041 in 2015-2019 (in 2024 dollars), a change larger than the surveys' margins of error.
- Median household income
- $152,261
- Income per person
- $57,730
- Below the poverty line
- 5.2%
- Unemployed (of the labor force)
- 4.1%
- Adults 25+ with a bachelor's degree
- 49.0%
- Adjusted gross income per tax return, 2022
- $137,86016,630 returns; wages 75% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 98038?
FHFA's house price index for 98038, built from repeat sales and appraisals of the same homes, rose 110% from 2015 to 2025 and rose 46% from 2020 to 2025, and moved −2.7% in 2025.
- Median home value (owners' estimate)
- $776,900
- Median gross rent
- $2,316
- Homes owned by their occupants
- 85.6%
- Housing units
- 12,936
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 98038?
752 business establishments had a location in this ZIP code in 2023, 66 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction153
- Health care and social assistance89
- Professional, scientific, and technical services82
- Other services (except public administration)71
- Accommodation and food services60
- Retail trade57
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 98038?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 98025 | Hobart | 52 | – | 1.1 mi |
| 98051 | Ravensdale | 3,442 | $136k | 6.2 mi |
| 98027 | Issaquah | 28,955 | $153k | 6.7 mi |
| 98010 | Black Diamond | 6,857 | $142k | 7.4 mi |
| 98058 | Renton | 42,980 | $115k | 8.0 mi |
| 98042 | Kent | 50,216 | $128k | 8.4 mi |
| 98059 | Renton | 42,406 | $139k | 9.6 mi |
| 98045 | North Bend | 15,289 | $176k | 13.4 mi |
| 98065 | Snoqualmie | 15,944 | $198k | 14.8 mi |
| 98022 | Enumclaw | 22,418 | $120k | 21.5 mi |
| 98050 | Preston | 108 | – | 8.9 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.