Richest ZIP codes in Cowlitz County, WA
These are the 7 ZIP codes in Cowlitz County with the highest median household income, out of 7 with at least 1,000 residents. 98625 (Kalama, $116,435), 98645 (Silverlake, $101,429) and 98674 (Woodland, $94,245) lead the list. There is no single "best" ZIP code in Cowlitz County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
Richest ZIP codes in Cowlitz County
| Rank | ZIP | Mailing city | Median household income | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 98625 | Kalama | $116,435 ±$28,759 | 7,655 | 2,915 | 2,411 |
| 2 | 98645 | Silverlake | $101,429 ±$23,760 | 2,216 | 876 | 689 |
| 3 | 98674 | Woodland | $94,245 ±$11,625 | 17,525 | 5,844 | 4,849 |
| 4 | 98611 | Castle Rock | $86,322 ±$12,746 | 9,302 | 3,539 | 3,918 |
| 5 | 98603 | Ariel | $78,281 ±$30,635 | 1,267 | 395 | 418 |
| 6 | 98626 | Kelso | $75,528 ±$3,861 | 26,892 | 10,342 | 10,566 |
| 7 | 98632 | Longview | $66,305 ±$4,952 | 50,635 | 20,613 | 21,820 |
How we ranked them
Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population. ZIP codes need at least 1,000 residents to be ranked; 7 of 10 qualify.
Which of these to mail, and why
Higher-income ZIP codes suit offers with a bigger ticket: remodeling, pools, roofing, financial planning, private schools, premium dining. A median describes the middle household, not every door, so the routes inside each ZIP still vary.
The top five ZIP codes on this list hold 13,569 households, on 22 carrier routes with 12,285 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 98625 on the EDDM route map
More rankings
- ZIP codes with the highest home values in Cowlitz County
- ZIP codes with the highest homeownership in Cowlitz County
- ZIP codes with the most families with kids in Cowlitz County
- ZIP codes with the most new movers in Cowlitz County
- Youngest ZIP codes in Cowlitz County
- Oldest ZIP codes in Cowlitz County
- Fastest-growing ZIP codes in Cowlitz County
- All Cowlitz County ZIP codes
Businesses that mail these ZIP codes
Map it and price it
EDDM guides
Frequently asked questions
- Which ZIP code in Cowlitz County has the highest median household income?
- 98625 (Kalama), at $116,435 (±$28,759), among 7 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population.
- Why are some ZIP codes missing?
- ZIP codes with fewer than 1,000 residents are left out because their survey estimates swing too much to rank, and so are ZIP codes where the Census Bureau did not publish this figure.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.