Lake Cassidy, WA ZIP Codes
2 ZIP codes serve Lake Cassidy, Washington: 98270 and 98258. Together they are home to 107,801 residents in 37,643 households. That is more than the 3,292 people counted inside Lake Cassidy Census-designated place, because these ZIP codes reach past its boundary. Median household income ranges from $108,147 in 98270 to $123,898 in 98258.
Lake Cassidy Census-designated place
| Measure | Census figure |
|---|---|
| Residents | 3,292 |
| Households | 1,311 |
| Median household income | $113,403 |
| Median home value | $705,000 |
| Median age | 50.7 |
| Median rent | $1,734 |
All 2 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 107,801 |
| Households (sum of ZIP codes) | 37,643 |
| Median household income, range across ZIP codes | $108,147 (98270) to $123,898 (98258) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $115,754 |
| Homeowners | 74.4% |
| Households with kids under 18 | 37.7% |
| Moved in the past year | 11.8% |
| Carrier routes in EDDM2GO's route library | 49 routes, 39,879 homes (2 of 2 ZIP codes) |
Top facts
- Highest median household income in Lake Cassidy: 98258 ($123,898)
- Most residents: 98270 (55,049 people)
- Highest homeownership: 98258 (78.5% own their home)
- Most households with kids: 98258 (43.2% of households)
- Most new movers: 98258 (12.1% moved in last year)
- Youngest median age: 98258 (36.1 years)
- Highest median home value: 98258 ($653,100)
Every ZIP code in Lake Cassidy
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 98270 | Marysville | 55,049 | 19,462 | $108,147 | $579,900 | 70.6% | 32.6% | 11.6% | 23 | 21,042 | 9% of its land |
| 98258 | Lake Stevens | 52,752 | 18,181 | $123,898 | $653,100 | 78.5% | 43.2% | 12.1% | 26 | 19,972 | 23% of its land |
A ZIP code is listed for Lake Cassidy when at least 10% of its land lies inside the Lake Cassidy Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Lake Cassidy. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Lake Cassidy.
Counties
- Snohomish County — 29 ZIP codes
Nearby cities sharing these ZIP codes
- Marysville — 2 ZIP codes
- Lake Stevens — 1 ZIP code
Price a mailing to Lake Cassidy ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Lake Cassidy, WA?
- 98270 and 98258. A ZIP code is listed for Lake Cassidy when at least 10% of its land lies inside the Lake Cassidy Census-designated place, when it holds at least 10% of the place's land, or when its USPS mailing city is Lake Cassidy.
- What is the population of Lake Cassidy, WA?
- The Census Bureau counts 3,292 residents inside Lake Cassidy Census-designated place (ACS 2020–2024). The 2 ZIP codes that serve Lake Cassidy hold 107,801 residents in all.
- What is the median household income in Lake Cassidy, WA?
- $113,403 inside Lake Cassidy Census-designated place, per the Census Bureau. Across its ZIP codes the medians run from $108,147 to $123,898.
- Which Lake Cassidy ZIP code has the highest median household income?
- 98258, at $123,898, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Lake Cassidy, WA?
- For the 2 of 2 ZIP codes in EDDM2GO's stored route library: 49 carrier routes reaching 39,879 residential and 1,131 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.