Which ZIP code in Sonoma County has the lowest median age?

94928 (Rohnert Park), at 33.8 (±1.1), among 27 ZIP codes with at least 1,000 residents.

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.

Youngest ZIP codes in Sonoma County, CA

These are the 25 ZIP codes in Sonoma County with the lowest median age, out of 27 with at least 1,000 residents. 94928 (Rohnert Park, 33.8), 95407 (Santa Rosa, 34.4) and 95452 (Kenwood, 35.6) lead the list. There is no single "best" ZIP code in Sonoma County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Youngest ZIP codes in Sonoma County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	94928	Rohnert Park	33.8 ±1.1	46,829	17,200	18,764
2	95407	Santa Rosa	34.4 ±1.4	42,036	13,168	14,298
3	95452	Kenwood	35.6 ±13.1	1,762	620	475
4	95401	Santa Rosa	39.2 ±1.6	36,861	13,840	15,027
5	94931	Cotati	39.2 ±3.2	9,487	4,072	3,755
6	95403	Santa Rosa	40.2 ±1.5	45,806	16,823	18,952
7	95436	Forestville	42.0 ±4.8	5,821	2,354	2,425
8	95492	Windsor	42.4 ±1.4	27,429	9,627	10,279
9	95404	Santa Rosa	43.4 ±2.0	37,011	15,478	17,784
10	94952	Petaluma	43.8 ±2.6	33,785	13,985	14,079
11	94951	Penngrove	44.2 ±12.5	3,294	1,419	1,408
12	94954	Petaluma	45.3 ±1.1	37,574	14,876	14,911
13	95405	Santa Rosa	45.5 ±2.4	22,744	9,429	9,286
14	95425	Cloverdale	46.4 ±4.9	10,978	4,309	4,509
15	95448	Healdsburg	46.5 ±3.0	16,077	6,741	7,688
16	94515	Calistoga	48.6 ±4.2	6,946	2,615	3,122
17	95472	Sebastopol	50.7 ±1.9	28,747	11,734	11,767
18	95476	Sonoma	52.1 ±2.4	35,196	15,072	15,681
19	95409	Santa Rosa	52.7 ±3.0	25,616	11,444	13,095
20	95446	Guerneville	53.2 ±2.6	4,607	2,374	2,875
21	94923	Bodega Bay	53.4 ±5.7	1,483	693	155
22	95441	Geyserville	57.2 ±4.9	1,648	705	629
23	95465	Occidental	57.7 ±11.0	1,203	545	535
24	95442	Glen Ellen	58.6 ±2.3	3,449	1,642	1,174
25	95421	Cazadero	59.3 ±4.2	1,570	663	491

How we ranked them

Ranked by median age of all residents, lowest first (ACS 5-year estimates, 2020–2024). ZIP codes need at least 1,000 residents to be ranked; 27 of 39 qualify.

Which of these to mail, and why

Younger ZIP codes skew toward renters, students and young families: fitness, quick-service food, apartments, entertainment and first-time-buyer offers.

The top five ZIP codes on this list hold 48,900 households, on 81 carrier routes with 52,319 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94928 on the EDDM route map

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Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in Sonoma County has the lowest median age?: 94928 (Rohnert Park), at 33.8 (±1.1), among 27 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median age of all residents, lowest 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.