PlainZIP

Atherton, CA · standard

ZIP Code 94027

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

7,089
527/sq mi
$250,000+
Median income
$2,000,000+
Median home value
83.2%
Bachelor's or higher

The verdict

Atherton pairs a top-decile household income with top-decile home values, in a low-density, homeowner-dominated area.

Top 1%
household income, US ZIPs
Top 1%
home value, US ZIPs
527
people per sq mi
88%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 94027 against every reporting US ZIP.

ZIP code 94027 is a mid-sized community (a standard USPS delivery area) in Atherton, San Mateo County, California, home to 7,089 residents across 13.5 square miles, a density of 527 people per square mile, in the Los Angeles time zone.

ZIP 94027 skews affluent, with a median household income of $250,000+ (146% above the California average), while per-capita income is $188,761. 5.3% of residents live below the poverty line, and the unemployment rate reads 3.2%. Median home value sits at $2,000,000+ (159% above the state average), median rent at $3,501 a month, and owner-occupancy at 87.6%.

This is a highly-educated ZIP: 83.2% of adults hold a bachelor's degree or higher, the median age is 49.1, and the average commute is 23 minutes. Beyond these figures, 10 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing San Mateo County, letting you compare 94027 to its immediate surroundings rather than a national baseline alone.

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 94027

Top 5 sectors by establishment count in Atherton, CA

Which industries have the most business establishments in ZIP 94027.

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 94027, Atherton, 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

7,089

Population

13.5

Area (sq mi)

527

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 94027?

49.1

Median Age

50.7%

Male

49.3%

Female

20.5%

Foreign-Born

White 68.2%
African American 1.3%
Asian 17.9%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 10.6%
Hispanic or Latino 14.2%

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

$188,761

Per Capita Income

5.3%

Poverty Rate

3.2%

Unemployment Rate

23.1 min

Mean Commute Time

How ZIP 94027 ranks nationally

Atherton, 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 87.7%
Bachelor's Degree or Higher 83.2%

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

What does housing look like?

2,676

Total Housing Units

2,236

Occupied Units

440

Vacant Units

2.84

Avg Household Size

Occupancy Type

Owner 87.6%
Renter 12.4%

$2,000,000+

Median Home Value

+159% vs state

$3,501

Median Rent

1960

Median Year Built

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

What businesses operate in this ZIP?

Census Bureau data shows 180 business establishments in ZIP 94027, employing approximately 1,883 people with a combined annual payroll of $168,104,000.

180

Businesses

1,883

Employees

$168.1M

Annual Payroll

14

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 42 23.3%
Real estate and rental and leasing 27 15.0%
Finance and insurance 23 12.8%
Health care and social assistance 20 11.1%
Other services (except public administration) 15 8.3%
Information 8 4.4%
Educational services 7 3.9%
Accommodation and food services 7 3.9%
Administrative and support and waste management and remediation services 6 3.3%
Arts, entertainment, and recreation 6 3.3%
Construction 5 2.8%
Wholesale trade 5 2.8%
Retail trade 4 2.2%
Management of companies and enterprises 3 1.7%

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 94027 vs 94061 →

ZIP 94027 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 94027 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 94027 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 94027 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
94061 Redwood City, CA 36,245 1.9 mi
94025 Menlo Park, CA 40,526 1.9 mi
94063 Redwood City, CA 30,949 2.9 mi
94301 Palo Alto, CA 16,995 3.0 mi
94305 Stanford, CA 13,862 3.1 mi
94028 Portola Valley, CA 6,534 5.2 mi
94303 Palo Alto, CA 45,467 4.7 mi
94304 Palo Alto, CA 3,627 5.2 mi
94070 San Carlos, CA 29,166 4.7 mi
94306 Palo Alto, CA 26,469 4.8 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 Atherton, CA California

Frequently Asked Questions

What county is ZIP code 94027 in? ▼
ZIP code 94027 (Atherton) 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 94027? ▼
ZIP code 94027 in Atherton, CA has a population of 7,089 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 94027? ▼
The median household income in ZIP 94027 is $250,000+, which is 228% above the national average of $76,288.
What is the average home value in ZIP 94027? ▼
The median home value in ZIP 94027 is $2,000,000+, which is 619% above the national average of $278,155.
What is the demographic makeup of ZIP 94027? ▼
The largest racial group in ZIP 94027 is White at 68.2%. Hispanic or Latino residents make up 14.2% of the population.
How many businesses are in ZIP code 94027? ▼
ZIP code 94027 has 180 business establishments employing approximately 1,883 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 94027? ▼
The top industries by establishment count in ZIP 94027 are: Professional, scientific, and technical services (42), Real estate and rental and leasing (27), Finance and insurance (23). There are 14 industry sectors represented in total.
What is the education level in ZIP code 94027? ▼
In ZIP code 94027, 87.7% of residents aged 25+ have a high school diploma or higher, and 83.2% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What is the average commute time in ZIP 94027? ▼
The mean commute time for workers in ZIP code 94027 is 23.1 minutes according to Census ACS data. The national average is roughly 26 minutes, so commuters here spend less time traveling to work than typical.
What percentage of residents own vs. rent in ZIP 94027? ▼
In ZIP code 94027, approximately 87.6% of occupied housing units are owner-occupied and 12.4% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 94027? ▼
The poverty rate in ZIP code 94027 is 5.3% 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.