Newcastle, WA ZIP Codes
2 ZIP codes serve Newcastle, Washington: 98059 and 98056. Together they are home to 78,255 residents in 29,013 households. That is more than the 12,989 people counted inside Newcastle city limits, because these ZIP codes reach past its boundary. Median household income ranges from $113,688 in 98056 to $138,654 in 98059.
Newcastle city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 12,989 |
| Households | 5,416 |
| Median household income | $160,278 |
| Median home value | $1,205,600 |
| Median age | 37.5 |
| Median rent | $2,369 |
All 2 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 78,255 |
| Households (sum of ZIP codes) | 29,013 |
| Median household income, range across ZIP codes | $113,688 (98056) to $138,654 (98059) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $126,183 |
| Homeowners | 65.5% |
| Households with kids under 18 | 34.3% |
| Moved in the past year | 11.9% |
| Carrier routes in EDDM2GO's route library | 39 routes, 31,089 homes (2 of 2 ZIP codes) |
Top facts
- Highest median household income in Newcastle: 98059 ($138,654)
- Most residents: 98059 (42,406 people)
- Highest homeownership: 98059 (76.6% own their home)
- Most households with kids: 98059 (41.2% of households)
- Most new movers: 98056 (12.4% moved in last year)
- Youngest median age: 98059 (38.1 years)
- Highest median home value: 98059 ($872,000)
Every ZIP code in Newcastle
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 98059 | Renton | 42,406 | 14,520 | $138,654 | $872,000 | 76.6% | 41.2% | 11.5% | 20 | 15,809 | 15% of its land |
| 98056 | Renton | 35,849 | 14,493 | $113,688 | $797,300 | 54.3% | 27.4% | 12.4% | 19 | 15,905 | 26% of its land |
A ZIP code is listed for Newcastle when at least 10% of its land lies inside Newcastle city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Newcastle. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Newcastle.
Counties
- King County — 88 ZIP codes
Nearby cities sharing these ZIP codes
- Renton — 5 ZIP codes
- East Renton Highlands — 3 ZIP codes
Price a mailing to Newcastle ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Newcastle, WA?
- 98059 and 98056. A ZIP code is listed for Newcastle when at least 10% of its land lies inside Newcastle city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Newcastle.
- What is the population of Newcastle, WA?
- The Census Bureau counts 12,989 residents inside Newcastle city limits (ACS 2020–2024). The 2 ZIP codes that serve Newcastle hold 78,255 residents in all.
- What is the median household income in Newcastle, WA?
- $160,278 inside Newcastle city limits, per the Census Bureau. Across its ZIP codes the medians run from $113,688 to $138,654.
- Which Newcastle ZIP code has the highest median household income?
- 98059, at $138,654, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Newcastle, WA?
- For the 2 of 2 ZIP codes in EDDM2GO's stored route library: 39 carrier routes reaching 31,089 residential and 624 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.