What city is 94028 in?

94028 is a Portola Valley, CA mailing address. By land area, 52% lies inside Portola Valley, 13% lies inside Palo Alto and 2% lies inside Ladera; the rest is outside any Census-defined city or community.

What is the population of 94028?

About 6,531 people (±600), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 6,904.

What is the median household income in 94028?

$250,000+, compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 94028?

8 USPS carrier routes with 2,612 residential and 90 business mailboxes (2,702 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 94028?

The closest, measured center to center: 94304 (2.9 mi, Palo Alto), 94305 (3.8 mi, Stanford), 94022 (4 mi, Los Altos Hills), 94062 (5.2 mi, Woodside), 94306 (5.3 mi, Palo Alto) and 94025 (5.5 mi, Menlo Park).

94028 ZIP Code, Portola Valley, CA

Q: What county is 94028 in?

94028 is mostly in San Mateo County (81% of its land), with smaller parts in Santa Clara County.

94028 is a ZIP code in Portola Valley, California — mostly in San Mateo County (81% of its land), with smaller parts in Santa Clara County. It covers 17 square miles of land. The closest ZIP codes are 94304, 94305 and 94022. 6,531 people live here in 2,637 households. With about 377 people per square mile it is lightly settled, and most homes are owner-occupied (82%). Median household income is $250,000+, well above the California median of $99,122; the median age is 57.2, older than most ZIP codes.

Quick facts

Mailing city: Portola Valley, CA
County: San Mateo County
Land area: 17 sq mi
Population: 6,531
Median household income: $250,000+
Carrier routes: 8 (2,612 homes)

Key figures

Measure	Value
Residents	6,531
Households	2,637
Median household income	$250,000+
Income per person	$175,395
Median age	57.2
Homeowners	81.9%
Median home value	$2,000,000+
Median rent	$3,501
Bachelor's degree or higher	82.9%
Average commute (minutes)	17.7
Households with kids under 18	21.2%
Moved in the past year	6.3%
Below the poverty line	4.4%
Broadband internet	97.5%
Speak a non-English language at home	17.7%

Household income

% of households	Value
<$10K	1.2%
$10–15K	0.6%
$15–25K	4.3%
$25–35K	1.3%
$35–50K	1.6%
$50–75K	1.3%
$75–100K	4.9%
$100–150K	15.2%
$150–200K	5.3%
$200K+	64.4%

Age

% of all residents	Value
<10	11.0%
10–19	7.9%
20–24	2.7%
25–34	6.1%
35–44	7.9%
45–54	11.1%
55–64	13.6%
65–74	20.4%
75+	19.3%

Tenure

% of housing units	Value
Owned, with mortgage	39.7%
Owned outright	37.6%
Rented	16.7%
Vacant	6.0%

Type of building

% of housing units	Value
Detached house	86.7%
Townhome	1.7%
2–4 units	0.5%
5–19 units	8.3%
20+ units	0.5%
Mobile / other	2.2%

Businesses in 94028

210 business establishments with 1,822 employees (ZIP Codes Business Patterns 2023).

Professional, Scientific, and Technical Services: 55
Real Estate and Rental and Leasing: 29
Health Care and Social Assistance: 22
Other Services (except Public Administration): 21
Finance and Insurance: 16
Accommodation and Food Services: 13
Retail Trade: 9
Educational Services: 9

EDDM carrier routes

94028 has 8 USPS carrier routes with 2,612 residential and 90 business mailboxes. Open the EDDM route map.

Carrier routes in 94028

94028 has 8 USPS carrier routes (8 city (C)) with 2,612 residential and 90 business mailboxes. Routes range from 271 homes (C054) to 364 homes (C050); the median route has 331 homes. The Census counted 2,637 households in 94028 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	8
500–749	0
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 94028 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C054 — USPS business mailboxes 30, 271 homes
Route C067 — USPS business mailboxes 28, 309 homes
Route C045 — USPS business mailboxes 25, 330 homes
Route C066 — USPS business mailboxes 4, 345 homes
Route C050 — USPS business mailboxes 2, 364 homes

Select these 5 routes on the route map

Every carrier route in 94028

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C032	City	332	0	$200,001+	—	—	—
C041	City	309	0	$200,001+	—	—	—
C045	City	330	25	$200,001+	—	—	—
C050	City	364	2	$200,001+	—	—	—
C053	City	352	1	$200,001+	—	—	—
C054	City	271	30	$200,001+	—	—	—
C066	City	345	4	$200,001+	—	—	—
C067	City	309	28	$200,001+	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 94028 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

94304 — Palo Alto city, CA (2.9 mi)
94305 — Stanford CDP, CA (3.8 mi)
94022 — Los Altos Hills town, CA (4 mi)
94062 — Woodside town, CA (5.2 mi)
94306 — Palo Alto city, CA (5.3 mi)
94025 — Menlo Park city, CA (5.5 mi)
94027 — Atherton town, CA (5.7 mi)
94301 — Palo Alto city, CA (5.9 mi)

Areas that include 94028

Palo Alto, CA ZIP codes — 6 ZIP codes
Portola Valley, CA ZIP codes — 1 ZIP code
Ladera, CA ZIP codes — 1 ZIP code
San Mateo County ZIP codes — 31 ZIP codes
Santa Clara County ZIP codes — 62 ZIP codes
California ZIP code data

Where it ranks

Mail every home in 94028

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 94028, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 94028 in?: 94028 is a Portola Valley, CA mailing address. By land area, 52% lies inside Portola Valley, 13% lies inside Palo Alto and 2% lies inside Ladera; the rest is outside any Census-defined city or community.
What county is 94028 in?: 94028 is mostly in San Mateo County (81% of its land), with smaller parts in Santa Clara County.
What is the population of 94028?: About 6,531 people (±600), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 6,904.
What is the median household income in 94028?: $250,000+, compared with $99,122 for California as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 94028?: 8 USPS carrier routes with 2,612 residential and 90 business mailboxes (2,702 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 94028?: The closest, measured center to center: 94304 (2.9 mi, Palo Alto), 94305 (3.8 mi, Stanford), 94022 (4 mi, Los Altos Hills), 94062 (5.2 mi, Woodside), 94306 (5.3 mi, Palo Alto) and 94025 (5.5 mi, Menlo Park).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.