Which ZIP code in San Mateo County has the highest median household income?

94027 (Atherton), at $250,000+, 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.

Richest ZIP codes in San Mateo County, CA

These are the 25 ZIP codes in San Mateo County with the highest median household income, out of 28 with at least 1,000 residents. 94027 (Atherton, $250,000+), 94028 (Portola Valley, $250,000+) and 94020 (La Honda, $250,000+) 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.

Richest ZIP codes in San Mateo County

Rank	ZIP	Mailing city	Median household income	Residents	Households	Residential mailboxes
1	94027	Atherton	$250,000+	7,002	2,236	2,478
2	94028	Portola Valley	$250,000+	6,531	2,637	2,612
3	94020	La Honda	$250,000+	1,694	829	198
4	94070	San Carlos	$240,074 ±$16,440	30,447	11,279	12,601
5	94037	Montara	$233,826 ±$102,824	2,917	1,003	—
6	94062	Redwood City	$233,262 ±$19,322	25,759	9,729	10,388
7	94018	El Granada	$230,053 ±$95,569	3,834	1,563	—
8	94025	Menlo Park	$216,601 ±$19,747	40,721	14,619	18,110
9	94065	Redwood City	$215,955 ±$15,324	11,673	4,569	5,233
10	94002	Belmont	$203,965 ±$18,616	27,534	10,567	11,615
11	94010	Burlingame	$196,882 ±$14,903	43,025	16,317	18,939
12	94404	San Mateo	$192,332 ±$12,368	35,881	14,717	15,551
13	94403	San Mateo	$174,917 ±$15,671	43,276	16,414	18,180
14	94402	San Mateo	$172,522 ±$19,726	25,475	10,125	10,696
15	94030	Millbrae	$163,476 ±$11,394	22,689	8,121	9,065
16	94044	Pacifica	$160,408 ±$13,253	37,274	13,928	—
17	94005	Brisbane	$156,169 ±$39,706	4,692	1,912	2,005
18	94019	Half Moon Bay	$153,781 ±$20,814	14,419	5,221	5,940
19	94303	Palo Alto	$151,609 ±$10,205	46,879	14,466	14,447
20	94061	Redwood City	$146,265 ±$8,877	37,048	12,805	14,239
21	94066	San Bruno	$141,272 ±$9,325	42,728	15,224	16,434
22	94080	South San Francisco	$136,733 ±$8,111	64,761	21,966	22,939
23	94060	Pescadero	$127,973 ±$47,180	1,465	362	—
24	94015	Daly City	$127,056 ±$6,241	64,091	20,350	20,600
25	94014	Daly City	$122,966 ±$8,736	45,315	14,101	14,348

How we ranked them

Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population. ZIP codes need at least 1,000 residents to be ranked; 28 of 31 qualify.

Which of these to mail, and why

Higher-income ZIP codes suit offers with a bigger ticket: remodeling, pools, roofing, financial planning, private schools, premium dining. A median describes the middle household, not every door, so the routes inside each ZIP still vary.

The top five ZIP codes on this list hold 17,984 households. Open any of them on the route map to see each carrier route's own figures before you choose.

Open 94027 on the EDDM route map

More rankings

Businesses that mail these ZIP codes

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Frequently asked questions

Which ZIP code in San Mateo County has the highest median household income?: 94027 (Atherton), at $250,000+, among 28 ZIP codes with at least 1,000 residents.
How is this ranking calculated?: Ranked by median household income (ACS 5-year estimates, 2020–2024). The Census Bureau caps published medians at $250,000; ZIP codes at the cap are shown as $250,000+ and ordered by population.
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.