PlainZIP

Portola Valley, CA · standard

ZIP Code 94028

San Mateo County, California - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

6,534
166/sq mi
$250,000+
Median income
$2,000,000+
Median home value
82.9%
Bachelor's or higher

The verdict

Portola Valley pairs a top-decile household income with top-decile home values, in a rural, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 1%
home value, US ZIPs
166
people per sq mi
82%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 94028 against every reporting US ZIP.

ZIP code 94028 is a mid-sized community (a standard USPS delivery area) in Portola Valley, San Mateo County, California, home to 6,534 residents across 39.5 square miles, a density of 166 people per square mile, in the Los Angeles time zone.

ZIP 94028 skews affluent, with a median household income of $250,000+ (146% above the California average), while per-capita income is $175,395. Local economic indicators show a 4.4% poverty rate alongside 4.3% unemployment. The typical home here is valued at $2,000,000+ (159% above the state average); renters pay a median of $3,501 monthly, and 81.9% of units are owner-occupied.

This is a highly-educated ZIP: 82.9% of adults hold a bachelor's degree or higher, the median age is 57.2, and the average commute is -. To put 94028 in local context, 10 ZIP codes within roughly 10 miles appear further down this page alongside 6 additional ZIPs in San Mateo County, for a geography-aware comparison.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Top industries in ZIP 94028

Top 5 sectors by establishment count in Portola Valley, CA

Which industries have the most business establishments in ZIP 94028.

establishments

What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.

Source U.S. Census Bureau · ZIP Code Business Patterns (ZBP) As of 2023

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 94028, Portola Valley, CA · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

6,534

Population

39.5

Area (sq mi)

166

People / sq mi

Los Angeles

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 94028?

57.2

Median Age

50.5%

Male

49.5%

Female

17.7%

Foreign-Born

White 76.6%
African American 0.1%
Asian 9.3%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 8.9%
Hispanic or Latino 11.3%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$250,000+

Median Household Income

+146% vs state

$175,395

Per Capita Income

4.4%

Poverty Rate

4.3%

Unemployment Rate

How ZIP 94028 ranks nationally

Portola Valley, CA household income vs. every US ZIP code

Median household income, with the Census top-code shown at $250,000+

$250,000 Top 1% higher than 99% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). Below this entry. $200,000–$220,000: 324 US ZIPs (1%). This entry sits in this band. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 85.6%
Bachelor's Degree or Higher 82.9%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

2,808

Total Housing Units

2,637

Occupied Units

171

Vacant Units

2.45

Avg Household Size

Occupancy Type

Owner 81.9%
Renter 18.1%

$2,000,000+

Median Home Value

+159% vs state

$3,501

Median Rent

1965

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How have home values changed over time?

FHFA House Price Index, annual appreciation data based on repeat sales and appraisals

-5.0%

YoY Change (2021)

93

HPI Index (2000 = 100)

-7%

Total Change Since 2000

Home values in ZIP 94028 have decreased 5.0% over the past year (2021). Since 2000, this ZIP has seen -7% cumulative appreciation.

Year Annual Change HPI Index
2020 – 98
2021 -5.0% 93

Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2021. ZIP codes with few transactions may show missing values.

What businesses operate in this ZIP?

Census Bureau data shows 210 business establishments in ZIP 94028, employing approximately 1,822 people with a combined annual payroll of $140,292,000.

210

Businesses

1,822

Employees

$140.3M

Annual Payroll

14

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 55 26.2%
Real estate and rental and leasing 29 13.8%
Health care and social assistance 22 10.5%
Other services (except public administration) 21 10.0%
Finance and insurance 16 7.6%
Accommodation and food services 13 6.2%
Retail trade 9 4.3%
Educational services 9 4.3%
Information 7 3.3%
Agriculture, forestry, fishing and hunting 6 2.9%
Administrative and support and waste management and remediation services 6 2.9%
Arts, entertainment, and recreation 5 2.4%
Construction 4 1.9%
Wholesale trade 3 1.4%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 94028 vs 94304 →

ZIP 94028 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 94028 ranks #9 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 94028 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 94028 ranks the highest of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
94304 Palo Alto, CA 3,627 2.3 mi
94305 Stanford, CA 13,862 3.6 mi
94027 Atherton, CA 7,089 5.2 mi
94022 Los Altos, CA 18,500 4.2 mi
94061 Redwood City, CA 36,245 5.9 mi
94020 La Honda, CA 1,559 6.6 mi
94306 Palo Alto, CA 26,469 5.3 mi
94063 Redwood City, CA 30,949 8.0 mi
94025 Menlo Park, CA 40,526 6.3 mi
94301 Palo Alto, CA 16,995 5.8 mi

More ZIP Codes in San Mateo County

94080 standard
South San Francisco, CA
Pop: 63,975
94015 standard
Daly City, CA
Pop: 60,927
94014 standard
Daly City, CA
Pop: 47,014
94303 standard
Palo Alto, CA
Pop: 45,467
94066 standard
San Bruno, CA
Pop: 41,130
94010 standard
Burlingame, CA
Pop: 40,737

Related Areas

San Mateo County Portola Valley, CA California

Frequently Asked Questions

What county is ZIP code 94028 in? ▼
ZIP code 94028 (Portola Valley) is located in San Mateo County, California. San Mateo County contains multiple ZIP codes, see the full list at /counties/san-mateo-ca.
What is the population of ZIP code 94028? ▼
ZIP code 94028 in Portola Valley, CA has a population of 6,534 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 94028? ▼
The median household income in ZIP 94028 is $250,000+, which is 228% above the national average of $76,288.
What is the average home value in ZIP 94028? ▼
The median home value in ZIP 94028 is $2,000,000+, which is 619% above the national average of $278,155.
What is the demographic makeup of ZIP 94028? ▼
The largest racial group in ZIP 94028 is White at 76.6%. Hispanic or Latino residents make up 11.3% of the population.
How many businesses are in ZIP code 94028? ▼
ZIP code 94028 has 210 business establishments employing approximately 1,822 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 94028? ▼
The top industries by establishment count in ZIP 94028 are: Professional, scientific, and technical services (55), Real estate and rental and leasing (29), Health care and social assistance (22). There are 14 industry sectors represented in total.
How have home values changed in ZIP code 94028? ▼
According to the FHFA House Price Index, home values in ZIP 94028 decreased by 5.0% in 2021. Since 2000, home values in this ZIP have declined by approximately 7%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 94028? ▼
In ZIP code 94028, 85.6% of residents aged 25+ have a high school diploma or higher, and 82.9% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 94028? ▼
In ZIP code 94028, approximately 81.9% of occupied housing units are owner-occupied and 18.1% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 94028? ▼
The poverty rate in ZIP code 94028 is 4.4% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.