Which ZIP code in San Mateo County has the highest share of households with children?

94303 (Palo Alto), at 37.4%, 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.

ZIP codes with the most families with kids in San Mateo County, CA

These are the 25 ZIP codes in San Mateo County with the highest share of households with children, out of 28 with at least 1,000 residents. 94303 (Palo Alto, 37.4%), 94070 (San Carlos, 37.4%) and 94002 (Belmont, 35.6%) 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.

ZIP codes with the most families with kids in San Mateo County

Rank	ZIP	Mailing city	Households with children under 18	Residents	Households	Residential mailboxes
1	94303	Palo Alto	37.4%	46,879	14,466	14,447
2	94070	San Carlos	37.4%	30,447	11,279	12,601
3	94002	Belmont	35.6%	27,534	10,567	11,615
4	94065	Redwood City	34.0%	11,673	4,569	5,233
5	94061	Redwood City	33.9%	37,048	12,805	14,239
6	94010	Burlingame	33.1%	43,025	16,317	18,939
7	94025	Menlo Park	33.0%	40,721	14,619	18,110
8	94404	San Mateo	32.6%	35,881	14,717	15,551
9	94402	San Mateo	29.8%	25,475	10,125	10,696
10	94027	Atherton	29.7%	7,002	2,236	2,478
11	94063	Redwood City	29.6%	34,433	11,427	12,701
12	94038	Moss Beach	29.4%	2,683	915	797
13	94030	Millbrae	29.2%	22,689	8,121	9,065
14	94080	South San Francisco	28.9%	64,761	21,966	22,939
15	94403	San Mateo	28.8%	43,276	16,414	18,180
16	94015	Daly City	28.4%	64,091	20,350	20,600
17	94062	Redwood City	28.3%	25,759	9,729	10,388
18	94019	Half Moon Bay	28.2%	14,419	5,221	5,940
19	94044	Pacifica	28.1%	37,274	13,928	—
20	94060	Pescadero	27.3%	1,465	362	—
21	94014	Daly City	27.1%	45,315	14,101	14,348
22	94401	San Mateo	26.9%	35,295	13,026	13,804
23	94066	San Bruno	26.5%	42,728	15,224	16,434
24	94037	Montara	26.3%	2,917	1,003	—
25	94018	El Granada	25.0%	3,834	1,563	—

How we ranked them

Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files. ZIP codes need at least 1,000 residents to be ranked; 28 of 31 qualify.

Which of these to mail, and why

Households with children buy tutoring, youth sports, pediatric and family dental care, child care, birthday venues and family dining. EDDM reaches every door on a route, so a higher share means more of your pieces land with families.

The top five ZIP codes on this list hold 53,686 households, on 122 carrier routes with 58,135 residential mailboxes. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94303 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 highest share of households with children?: 94303 (Palo Alto), at 37.4%, among 28 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by the share of households with one or more people under 18 (ACS Data Profile, 2020–2024). The Census Bureau does not publish a margin of error for this share in our files.
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.