94028 ZIP Code — Portola Valley, CA

San Mateo County, California

ZIP code 94028 is located in Portola Valley, California, within San Mateo County. It covers approximately 17.32 square miles and serves a population of 6,888 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 650.

About ZIP code 94028

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1960s, giving the area an established character. Median home value is $2,000,000. Owner-occupancy is high at 83%, well above the national average.

The gap between median ($243,516) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 3% is below the national average. 47% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 23 minutes is near the national average. Remote work is prevalent — 39% of workers work from home.

Educational attainment is high — 78% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 94028 reflects a community defined by a highly educated population, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

6,888

population

17.32

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

94028 ZIP code map

Cities in ZIP code 94028

Below are the cities the US Postal Service accepts for ZIP code 94028. Using any city not on this list may result in mail delivery delays.

City	Status
Portola Valley	Acceptable
Portola Valley	Preferred

Nearby ZIP codes

94304 Palo Alto (3.6 mi) 94022 Los Altos (3.6 mi) 94305 Stanford (4.6 mi) 94062 Redwood City (5.2 mi) 94306 Palo Alto (5.5 mi) 94027 Atherton (5.6 mi) 94024 Los Altos (5.8 mi) 94301 Palo Alto (6.2 mi) 94020 La Honda (6.3 mi) 94025 Menlo Park (6.4 mi) 94061 Redwood City (6.7 mi) 94040 Mountain View (7 mi)

Demographics updated 06/2026

Population
Total population	6,888
Population density	398 / sq mi
State FIPS	06
County FIPS	081

Geography
Land area	17.32 sq mi
Water area	0.09 sq mi
Latitude	37.3689
Longitude	-122.2143
Timezone	Pacific (PT)
Area code	650

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	9.7%	18.4%	32.6%
$50k – $100k	10.9%	20.5%	27.7%
$100k – $200k	23.5%	30.5%	26.4%
Over $200k	55.9%	30.6%	13.3%

Demographics & statistics

6,888

Population

398

People per sq mi

55.9

Median age

$243,516

Median household income

$157,655

Per capita income

$2,000,000

Median home value

$3,501

Median monthly rent

83.2%

Home ownership

3.1%

Poverty rate

4.4%

Unemployment

2,295

Housing units

77.9%

Bachelor's or higher

Age distribution

Male Female

160

Under 5

158

163

5–9

161

116

10–14

115

191

15–19

188

173

20–24

171

227

25–34

223

239

35–44

235

411

45–54

405

290

55–59

286

288

60–64

284

580

65–74

570

379

75–84

374

253

85+

249

← Male

Female →

Age summary

Group	Count	%
Under 18	1,089	15.8%
18 and over	5,799	84.2%
65 and over	2,405	34.9%
Median age	55.9 years

Race & ethnicity

White 70.8%

Hispanic or Latino 10%

Two or more races 6.7%

Asian 6.2%

Other race 6.1%

American Indian / Alaska Native 0.1%

Black or African American 0.1%

Group	Count	%
White	5,413	70.8%
Hispanic or Latino	762	10%
Two or more races	514	6.7%
Asian	478	6.2%
Other race	469	6.1%
American Indian / Alaska Native	10	0.1%
Black or African American	4	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	9.7%	18.4%	32.6%
$50k – $100k	10.9%	20.5%	27.7%
$100k – $200k	23.5%	30.5%	26.4%
Over $200k	55.9%	30.6%	13.3%

Under $10k 1.1%

$15k–$25k 3.2%

$25k–$35k 2.5%

$35k–$50k 2.2%

$50k–$75k 2.9%

$75k–$100k 6.3%

$100k–$150k 13.4%

$150k–$200k 10.4%

$200k+ 58.0%

Range	% of households
Under $10k	1.1%
$15k–$25k	3.2%
$25k–$35k	2.5%
$35k–$50k	2.2%
$50k–$75k	2.9%
$75k–$100k	6.3%
$100k–$150k	13.4%
$150k–$200k	10.4%
$200k+	58.0%
Median income	$243,516

Housing

Home values

Under $50k 0.6%

$200k–$300k 0.5%

$300k–$500k 0.8%

$1M+ 98.1%

Housing overview

Metric	Value
Median home value	$2,000,000
Median rent / month	$3,501
Owner occupied	83.2%
Renter occupied	16.8%
Vacant	5.6%
Single-family detached	85.8%
Large apartment buildings	0.5%
Mobile homes	2.9%
Median rooms	7.1
Avg household size (owned)	2.65

Year built

Era	%
2020 or later	0.0%
2010–2019	3.5%
2000–2009	4.4%
1990–1999	4.8%
1980–1989	16.7%
1970–1979	16.2%
1960–1969	28.4%
1950–1959	17.9%
1940–1949	0.9%
1939 or earlier	7.2%

Bedrooms

Size	% of units
No bedroom (studio)	2.5%
1 bedroom	7.8%
2 bedrooms	10.7%
3 bedrooms	31.7%
4 bedrooms	33.6%
5+ bedrooms	13.7%

Vehicles per household

Vehicles	% of households
No vehicle	4.5%
1 vehicle	21.7%
2 vehicles	32.3%
3 or more	41.5%

Heating fuel

Fuel type	%
Utility gas	76.0%
Electricity	20.6%
Propane / LP gas	1.9%
Fuel oil	0.4%
Solar	0.5%

Households & families

Household type	Count	%
Married-couple family	1,751	68.0%
Cohabiting couple	75	2.9%
Male householder, no spouse	363	14.1%
Female householder, no spouse	386	15.0%
Households with children under 18	490	19.0%
Households with seniors (65+)	1,513	58.8%
Average household size	2.65

Marital status

Status	Male	Female
Never married	26.4%	16.4%
Married	63.2%	63.7%
Separated	1.0%	0.0%
Widowed	6.7%	8.7%
Divorced	2.7%	11.2%

Education

Less than 9th grade 2.7%

Some HS, no diploma 3.9%

HS graduate 4.1%

Some college, no degree 6.8%

Associate's degree 4.6%

Bachelor's degree 32.1%

Graduate / professional 45.8%

Metric	%
HS diploma or higher	93.4%
Bachelor's or higher	77.9%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	183	12.2%
Kindergarten	98	6.5%
Elementary school	396	26.3%
High school	325	21.6%
College / grad school	502	33.4%

Employment

Industry of employment

Professional & management 25.3%

Education & healthcare 17.7%

Agriculture & mining 13.3%

Finance & real estate 10.7%

Information 8.5%

Manufacturing 7.0%

Arts, food & hospitality 6.3%

Construction 4.8%

Retail trade 2.6%

Other services 1.2%

Public administration 1.2%

Wholesale trade 1.1%

Transportation & utilities 0.4%

Occupation

Category	%
Management, business & arts	69.7%
Service	6.4%
Sales & office	10.2%
Natural resources & construction	12.8%
Production & transportation	0.9%

Employment type

Type	%
Private sector	86.2%
Government	2.7%
Self-employed	10.3%
Unpaid family workers	0.7%

Commute

Method	%
Drive alone	49.1%
Carpool	3.6%
Public transit	1.3%
Walk	1.9%
Work from home	39.1%
Other means	4.9%
Avg commute (minutes)	22.7

Poverty

All people 3.1%

Under 18 years 0.0%

18 and over 3.7%

Married-couple families 0.0%

Female-led households 0.0%

Income support

Source	% of households
Social Security	47.1%
Retirement income	32.5%
Supplemental Security	2.4%
Cash public assistance	0.0%
Food stamps / SNAP	1.3%

Health indicators

Condition	%
Obesity	20.6%
High blood pressure	30.1%
High cholesterol	35.3%
Diabetes	8.4%
Heart disease	6.2%
Stroke	2.5%
Asthma	8.3%
Arthritis	24.2%
Kidney disease	2.8%
Pulmonary disease	4.7%
Cancer	9.7%

Behavior / access	%
Smoking	6.0%
Binge drinking	15.3%
No physical activity	12.3%
Less than 7 hrs sleep	23.9%
Depression	14.2%
Fair or poor health	8.6%
Poor mental health	9.7%
Poor physical health	7.4%
No health insurance	4.6%
Visited doctor (checkup)	73.0%
Visited dentist	80.9%
Cholesterol screening	96.4%
Teeth loss	4.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	267	4.6%

Disability	%
Any disability	9.6%
Under 18	5.2%
18–64 years	5.2%
65 and over	18.1%

Health insurance coverage

Type	%
Private insurance	84.2%
Public insurance	34.5%
No insurance	3.9%
Uninsured under 19	0.0%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	6,570	95.4%
Spanish	403	6.1%
Other Indo-European	348	5.3%
Asian & Pacific Islander	34	0.5%
Other languages	21	0.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,651	82.0%
Born in same state	5,504	79.9%
Born in different state	3,179	46.2%
Foreign born	147	2.1%
Naturalized citizen	1,237	18.0%
Not a US citizen	565	45.7%

Ancestry

Ancestry	Count	%
French	1,001	14.5%
Italian	975	14.2%
Arab	135	2%
English	123	1.8%
Polish	110	1.6%

Ancestry	Count	%
Dutch	107	1.6%
Norwegian	85	1.2%
Irish	69	1%
German	14	0.2%

Technology access

Metric	% of households
Computer access	37.4%
Internet access	99.1%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 94028

What city is ZIP code 94028 in?

ZIP code 94028 is primarily assigned to Portola Valley, California.

What county is ZIP code 94028 in?

ZIP code 94028 falls within San Mateo County, California.

How educated is the population of ZIP code 94028?

78% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 94028 have an older population?

35% of residents in ZIP code 94028 are 65 or older, above the national average of ~17%.

Does ZIP code 94028 have a large retiree population?

47% of households in ZIP code 94028 receive Social Security income, suggesting a significant retiree or disability population.

Is ZIP code 94028 mostly owner-occupied?

83% of occupied units in ZIP code 94028 are owner-occupied, well above the national average.

What timezone is ZIP code 94028 in?

ZIP code 94028 observes the PST timezone.