Which ZIP code in Alameda County has the highest median age?

94707 (Berkeley), at 52.9 (±2.2), among 50 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.

Oldest ZIP codes in Alameda County, CA

These are the 25 ZIP codes in Alameda County with the highest median age, out of 50 with at least 1,000 residents. 94707 (Berkeley, 52.9), 94552 (Castro Valley, 48.9) and 94708 (Berkeley, 48.6) lead the list. There is no single "best" ZIP code in Alameda County; the right one depends on who you want to reach, so the same ZIP codes are ranked several ways below.

Oldest ZIP codes in Alameda County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	94707	Berkeley	52.9 ±2.2	12,811	5,267	5,191
2	94552	Castro Valley	48.9 ±2.2	14,506	5,021	5,108
3	94708	Berkeley	48.6 ±2.1	11,947	4,800	4,846
4	94579	San Leandro	45.9 ±2.4	20,017	6,628	7,082
5	94514	Byron	45.7 ±12.9	1,953	576	218
6	94566	Pleasanton	45.1 ±1.0	44,222	15,921	16,687
7	94502	Alameda	44.8 ±2.6	13,430	4,780	5,255
8	94618	Oakland	44.4 ±2.4	16,958	7,553	7,808
9	94705	Berkeley	44.1 ±1.9	13,991	5,886	6,302
10	94539	Fremont	43.7 ±1.1	52,396	17,375	18,533
11	94611	Oakland	43.5 ±1.0	40,116	18,387	19,060
12	94542	Hayward	43.1 ±1.7	14,871	4,936	5,341
13	94587	Union City	43.0 ±0.9	67,464	21,240	21,795
14	94550	Livermore	42.3 ±1.1	49,873	17,564	18,701
15	94602	Oakland	41.9 ±1.3	31,759	12,496	12,325
16	94580	San Lorenzo	41.9 ±2.1	29,420	8,992	9,063
17	94546	Castro Valley	41.7 ±1.4	44,855	15,565	17,513
18	94702	Berkeley	41.5 ±1.4	17,635	7,662	8,187
19	94577	San Leandro	41.3 ±1.4	46,317	16,555	17,783
20	94588	Pleasanton	41.3 ±0.9	34,328	12,465	12,794
21	94545	Hayward	40.7 ±1.7	32,843	10,085	10,136
22	94610	Oakland	40.6 ±1.5	32,628	16,372	16,254
23	94501	Alameda	40.4 ±0.7	63,808	25,208	29,211
24	94551	Livermore	39.7 ±1.0	37,885	14,052	14,716
25	94710	Berkeley	39.6 ±2.6	8,380	3,780	3,679

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; 50 of 52 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 22,292 households, on 55 carrier routes with 22,445 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94707 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 Alameda County has the highest median age?: 94707 (Berkeley), at 52.9 (±2.2), among 50 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.