Oldest ZIP codes in Santa Rosa, CA
These are the 6 ZIP codes in Santa Rosa, CA with the highest median age, out of 6 with at least 1,000 residents. 95409 (Santa Rosa, 52.7), 95405 (Santa Rosa, 45.5) and 95404 (Santa Rosa, 43.4) lead the list. There is no single "best" ZIP code in Santa Rosa; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.
Oldest ZIP codes in Santa Rosa
| Rank | ZIP | Mailing city | Median age | Residents | Households | Residential mailboxes |
|---|---|---|---|---|---|---|
| 1 | 95409 | Santa Rosa | 52.7 ±3.0 | 25,616 | 11,444 | 13,095 |
| 2 | 95405 | Santa Rosa | 45.5 ±2.4 | 22,744 | 9,429 | 9,286 |
| 3 | 95404 | Santa Rosa | 43.4 ±2.0 | 37,011 | 15,478 | 17,784 |
| 4 | 95403 | Santa Rosa | 40.2 ±1.5 | 45,806 | 16,823 | 18,952 |
| 5 | 95401 | Santa Rosa | 39.2 ±1.6 | 36,861 | 13,840 | 15,027 |
| 6 | 95407 | Santa Rosa | 34.4 ±1.4 | 42,036 | 13,168 | 14,298 |
How we ranked them
Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 6 of 6 qualify.
Which of these to mail, and why
Older ZIP codes respond to health care, hearing and vision, Medicare plans, home safety, estate planning and services that come to the door.
The top five ZIP codes on this list hold 67,014 households, on 123 carrier routes with 74,144 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.
Open 95409 on the EDDM route map
More rankings
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- ZIP codes with the highest home values in Santa Rosa
- ZIP codes with the highest homeownership in Santa Rosa
- ZIP codes with the most families with kids in Santa Rosa
- ZIP codes with the most new movers in Santa Rosa
- Youngest ZIP codes in Santa Rosa
- Fastest-growing ZIP codes in Santa Rosa
- Oldest ZIP codes in Sonoma County
- All Santa Rosa ZIP codes
Businesses that mail these ZIP codes
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EDDM guides
Frequently asked questions
- Which ZIP code in Santa Rosa has the highest median age?
- 95409 (Santa Rosa), at 52.7 (±3.0), among 6 ZIP codes with at least 1,000 residents.
- How is this ranking calculated?
- Ranked by median age of all residents, highest first (ACS 5-year estimates, 2020–2024).
- 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.