Plain

Residential delivery area · California

ZIP Code 94028: Portola Valley, CA

ZIP code 94028 is in Portola Valley, California, mostly in San Mateo County (81% of its land) with the rest in Santa Clara County (Census 2020 ZIP-county file). About 6,500 people live there (Census Bureau, ACS 2020-2024). Median household income is $250,000 or more (Census Bureau, ACS 2020-2024). By Census place, its land lies in Portola Valley (52%), Palo Alto (13%) and Ladera (3%); 32% is outside any Census place.

  • ACS2020-24
  • Census2020
  • FHFA2021
  • ZBP2023
  • IRS2022
9national area: California, Alaska, Hawaii, Oregon, Washington and 7 more
940sectional center: San Francisco, CA (SCF 940)
28delivery area within it
Town
Portola Valley · its only residential ZIP
Census places
Portola Valley (52%); Palo Alto (13%); Ladera (3%) census-designated place
Metro area
San Francisco-Oakland-Fremont, CA
House district
CA-16 119th Congress
Time zone
Pacific
Land area
17.3 sq mi · 377 people per sq mi

Where is ZIP code 94028?

94028 centers on 37.375°, -122.213° and covers 17.3 square miles of land plus 0.1 of water. It borders 6 ZIP codes: 94304, 94305, 94022, 94062, 94025, 95033.

94022 · Los Altos94025 · Menlo Park94062 · Redwood City94304 · Palo Alto94305 · Stanford95033 · Los Gatos94028 · Portola Valley (this ZIP)94028940629402294025943049430594022 · Los Altos94025 · Menlo Park94062 · Redwood City94304 · Palo Alto94305 · Stanford95033 · Los Gatos94028 · Portola Valley (this ZIP)94028940629402294025943049430594022 · Los Altos94025 · Menlo Park94062 · Redwood City94304 · Palo Alto94305 · Stanford95033 · Los Gatos94028 · Portola Valley (this ZIP)940289406294022940259430494305
Shaded by median household income, in national fifths (ACS 2020-2024); 94028 outlined. Census 2020 ZCTA boundaries. <$54.1k$98.1k+no figure

The map draws ZIP code areas only. For the streets inside 94028, open its center on OpenStreetMap.

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).

How does 94028 compare with the rest of San Mateo County?

Rank of 94028 among the residential ZIP codes of its town, county and state (1 = the most; income and home value among ZIP codes of 1,000+ people living in households)
Measure94028In San Mateo CountyIn CA
People (ACS 2020-2024)6,53122nd of 311,086th of 1,802
Median household income$250k+1= of 231= of 1,189
Median home value$2M+1= of 271= of 1,317

1= means a shared first place: 94028's median household income ties with 2 other ZIP codes at the Census cap in San Mateo County; median household income ties with 11 other ZIP codes at the Census cap in California; median home value ties with 7 other ZIP codes at the Census cap in San Mateo County; median home value ties with 61 other ZIP codes at the Census cap in California.

Its median household income is at the Census cap of $250,000 or more, like 117 other U.S. residential ZIP codes (69 of the 118 are large enough to rank), and it is denser than 69% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).

How many people live in 94028?

The 2020 Census counted 6,904 people in 94028; the ACS, which samples households over 2020-2024, estimates 6,531. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.

People, ACS 2020-2024
6,531
2020 Census count
6,904
Households
2,637
Median age
57.2

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).

Who lives in 94028?

Of the 6,531 people the ACS estimates in 94028, 17.9% are under 18 and 39.7% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (74.1%), then Hispanic or Latino (11.3%).

  • Under 1817.9%
  • 18 to 6442.4%
  • 65 and older39.7%
Age of the people of 94028 (ACS 2020-2024, B01001)
  • White, not Hispanic74.1%
  • Hispanic or Latino11.3%
  • Asian, not Hispanic9.0%
  • Other or two or more5.4%
  • Black, not Hispanic0.1%
Race and Hispanic origin in 94028 (ACS 2020-2024, B03002); each person counted once

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.

What do households in 94028 earn?

Median household income is $250,000 or more (ACS 2020-2024), the highest of the 23 ranked ZIP codes in San Mateo County.

By IRS adjusted gross income per tax return ($980,737, 2022), 94028 ranks 11th in the U.S. among ZIP codes of 1,000+ people with 200+ returns and at most 1.5 returns per household (see the ranking).

Median household income
$250,000 or more
Income per person
$175,395
Below the poverty line
4.4%
Unemployed (of the labor force)
4.3%
Adults 25+ with a bachelor's degree
82.9%
Adjusted gross income per tax return, 2022
$980,7373,360 returns; wages 44% of AGI (IRS)

Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).

What are homes worth in 94028?

Median home value (owners' estimate)
$2,000,000 or more
Median gross rent
$3,500 or more
Homes owned by their occupants
81.9%
Housing units
2,808
0 100 200 300 400 19861990200020102021 0 100 200 300 400 19861990200020102021 0 100 200 300 400 19861990200020102021
Index = 100 in 1986, the first year FHFA reports for 94028; 2021: 275.3. Annual, not seasonally adjusted; FHFA calls its ZIP-level indexes developmental. FHFA's series for 94028 stops in 2021: it publishes no ZIP index for a year with too few repeat sales.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.

What businesses are in 94028?

210 business establishments had a location in this ZIP code in 2023, 35 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).

  • Professional, scientific, and technical services55
  • Real estate and rental and leasing29
  • Health care and social assistance22
  • Other services (except public administration)21
  • Finance and insurance16
  • Accommodation and food services13

Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).

Which ZIP codes are next to 94028?

ZIP codes that share a boundary with 94028, then the nearest by center
ZIPTownPeopleHousehold incomeDistance
94304Palo Alto5,000$154k2.9 mi
94305Stanford18,509$83k3.8 mi
94022Los Altos20,027$250k+4.0 mi
94062Redwood City25,759$233k5.2 mi
94025Menlo Park40,721$217k5.5 mi
95033Los Gatos9,600$189k19.9 mi
94306Palo Alto27,183$210k5.3 mi (near)
94027Atherton7,002$250k+5.7 mi (near)
94301Palo Alto17,508$242k5.9 mi (near)

Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.