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 High-density area
- $250,000+
- Median income Above-median income area
- $2,000,000+
- Median home value Above-median home value
- 83.2%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
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 average California ZIP), while per-capita income is $188,761. Both reported hardship measures are comparatively low in absolute terms: poverty is 5.3% and unemployment is 3.2%. Housing is both higher-cost and owner-heavy: median home value is $2,000,000+ (159% above the average California ZIP), while 87.6% of occupied homes are owner-occupied and median rent is $3,501.
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. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in San Mateo County, so 94027 can be compared with both its immediate and county-level context.
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.
- Professional, scientific, and technical services
Professional, scientific, and technical services
42 establishments
- Real estate and rental and leasing
Real estate and rental and leasing
27 establishments
- Finance and insurance
Finance and insurance
23 establishments
- Health care and social assistance
Health care and social assistance
20 establishments
- Other services (except public administration) 15
Other services (except public administration)
15 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, 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
Who lives in ZIP 94027?
49.1
Median Age
50.7%
Male
49.3%
Female
20.5%
Foreign-Born
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 ZIP avg
$188,761
Per Capita Income
5.3%
Poverty Rate
3.2%
Unemployment Rate
23.1 min
Mean Commute Time
How ZIP 94027 ranks among California ZIPs
Atherton, CA household income vs. every California ZIP code
Median household income among 1,583 reporting California ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$250,000 Top 1% higher than 99% of 1,583 California ZIPs
Each bar is a $20K-wide band; taller bars hold more California 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?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
2,676housing units
2,676
Total Housing Units
2,236
Occupied Units
440
Vacant Units
2.84
Avg Household Size
Occupancy Type
$2,000,000+
Median Home Value
+159% vs state ZIP avg
$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.
- 94303
Palo Alto (94303)
45,467 residents
- 94025
Menlo Park (94025)
40,526 residents
- 94061
Redwood City (94061)
36,245 residents
- 94063
Redwood City (94063)
30,949 residents
- 94070
San Carlos (94070)
29,166 residents
- 94306
Palo Alto (94306)
26,469 residents
- 94301 16,995
Palo Alto (94301)
16,995 residents
- 94305 13,862
Stanford (94305)
13,862 residents
- 94027 7,089
Atherton (94027)
7,089 residents
What this shows Among its immediate neighbors, ZIP 94027 ranks #9 by population - useful context the national average alone can't give.
ZIP 94027 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 94027
Atherton (94027)
$250,000 median income
- 94028
Portola Valley (94028)
$250,000 median income
- 94301
Palo Alto (94301)
$242,006 median income
- 94070
San Carlos (94070)
$240,074 median income
- 94025
Menlo Park (94025)
$216,601 median income
- 94306
Palo Alto (94306)
$210,000 median income
- 94304
Palo Alto (94304)
$154,141 median income
- 94303
Palo Alto (94303)
$151,609 median income
- 94061
Redwood City (94061)
$146,265 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.
| 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 |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 94027, both outside CA so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (7,089 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in San Mateo County
Related Areas
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.
Related
Take this with you
What to do with ZIP 94027's numbers, next.
- See how ZIP 94027 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where Atherton, CA ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
- Save this ZIP to your shortlist to track alongside others you're considering View your shortlist
ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.