Which ZIP code in San Mateo County has the lowest median age?

94063 (Redwood City), at 33.4 (±1.3), among 28 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 San Mateo County, CA

These are the 25 ZIP codes in San Mateo County with the lowest median age, out of 28 with at least 1,000 residents. 94063 (Redwood City, 33.4), 94401 (San Mateo, 35.9) and 94061 (Redwood City, 38.0) lead the list. There is no single "best" ZIP code in San Mateo 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 San Mateo County

Rank	ZIP	Mailing city	Median age	Residents	Households	Residential mailboxes
1	94063	Redwood City	33.4 ±1.3	34,433	11,427	12,701
2	94401	San Mateo	35.9 ±1.4	35,295	13,026	13,804
3	94061	Redwood City	38.0 ±1.3	37,048	12,805	14,239
4	94403	San Mateo	38.9 ±0.9	43,276	16,414	18,180
5	94303	Palo Alto	39.5 ±1.3	46,879	14,466	14,447
6	94025	Menlo Park	39.6 ±1.3	40,721	14,619	18,110
7	94066	San Bruno	39.7 ±1.1	42,728	15,224	16,434
8	94404	San Mateo	39.8 ±1.4	35,881	14,717	15,551
9	94002	Belmont	39.8 ±1.2	27,534	10,567	11,615
10	94402	San Mateo	40.8 ±1.5	25,475	10,125	10,696
11	94060	Pescadero	41.3 ±11.0	1,465	362	—
12	94015	Daly City	41.6 ±1.2	64,091	20,350	20,600
13	94070	San Carlos	41.6 ±1.6	30,447	11,279	12,601
14	94010	Burlingame	42.5 ±1.0	43,025	16,317	18,939
15	94014	Daly City	42.9 ±1.7	45,315	14,101	14,348
16	94065	Redwood City	43.0 ±1.7	11,673	4,569	5,233
17	94080	South San Francisco	43.1 ±1.4	64,761	21,966	22,939
18	94005	Brisbane	43.6 ±3.4	4,692	1,912	2,005
19	94030	Millbrae	43.7 ±1.8	22,689	8,121	9,065
20	94062	Redwood City	44.0 ±2.0	25,759	9,729	10,388
21	94044	Pacifica	44.6 ±1.4	37,274	13,928	—
22	94020	La Honda	46.8 ±14.4	1,694	829	198
23	94019	Half Moon Bay	46.9 ±3.2	14,419	5,221	5,940
24	94038	Moss Beach	47.1 ±11.7	2,683	915	797
25	94027	Atherton	49.1 ±2.7	7,002	2,236	2,478

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; 28 of 31 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 68,138 households, on 131 carrier routes with 73,371 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94063 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 San Mateo County has the lowest median age?: 94063 (Redwood City), at 33.4 (±1.3), among 28 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.