Atherton ZIP Code List — San Mateo County, CA

There is one unique ZIP code in Atherton, California and it is 94027. Area code: 650.

ZIP codes

5.03

sq mi land

0.03

sq mi water

650

area code

Atherton, CA ZIP code map

About Atherton, CA

Atherton, California, is an affluent residential community located in the heart of Silicon Valley. It is renowned for its spacious estates, beautiful landscapes, and elite private schools, making it one of the wealthiest cities in the United States. With a strong emphasis on privacy and tranquility, Atherton stands apart from the bustling tech hubs that surround it.

Location & geography

Atherton is situated in San Mateo County, approximately 25 miles south of San Francisco. The city is bordered by Menlo Park to the east, Redwood City to the south, and Palo Alto to the northwest, creating a suburban oasis within the urban landscape. Covering a land area of 5.03 square miles, Atherton also includes a minor water area of 0.03 square miles.

Community & economy

Atherton's community is characterized by its affluent residents who appreciate the city's natural beauty and serene environment. The local economy is primarily driven by technology, real estate, and service industries, with many residents commuting to nearby tech companies. Daily life in Atherton reflects a strong sense of community, often centered around schools, parks, and community events.

Transportation

Atherton is conveniently accessed via the nearby California State Route 84 and the El Camino Real, which connects the city to other parts of the Bay Area. The nearest major airports include San Francisco International Airport, located approximately 20 miles to the north, and San Carlos Airport for smaller aircraft. Public transportation options are available through Caltrain, which provides rail services to other cities in the region.

History

Founded in the late 19th century, Atherton was initially established as a site for wealthy individuals seeking a retreat from urban life. The city's development was significantly influenced by the arrival of the railroad and its proximity to Stanford University, which spurred growth and the establishment of key industries. Over the years, Atherton has remained a desirable location for affluent residents, with notable events including the preservation of its distinct residential character.

Did you know?

One surprising fact about Atherton is that it boasts some of the highest property values in the nation, attracting a population that includes many successful professionals and entrepreneurs. Despite its proximity to bustling tech hubs, Atherton maintains a serene atmosphere and expansive green spaces, setting it apart from its urban neighbors.

ZIP codes for Atherton, CA (1)

ZIP code	City	County	Map
94027	Atherton	San Mateo	View map

Demographics & statistics

7,142

Population

46.4

Median age

$250,001

Median household income

$187,421

Per capita income

$2,000,000

Median home value

$3,501

Median monthly rent

85.9%

Home ownership

3.9%

Poverty rate

2.2%

Unemployment

2,288

Housing units

86.0%

Bachelor's or higher

Age distribution

Male Female

Under 5

109

5–9

110

322

10–14

322

435

15–19

435

288

20–24

289

277

25–34

278

245

35–44

245

490

45–54

491

275

55–59

275

206

60–64

207

451

65–74

452

282

75–84

283

126

85+

126

← Male

Female →

Age summary

Group	Count	%
Under 18	1,419	19.9%
18 and over	5,723	80.1%
65 and over	1,720	24.1%
Median age	46.4 years

Race & ethnicity

White 69.2%

Asian 18.8%

Two or more races 5.4%

Hispanic or Latino 3.4%

Other race 1.5%

Black or African American 1.4%

Native Hawaiian / Pacific Islander 0.2%

Group	Count	%
White	5,117	69.2%
Asian	1,390	18.8%
Two or more races	402	5.4%
Hispanic or Latino	250	3.4%
Other race	113	1.5%
Black or African American	103	1.4%
Native Hawaiian / Pacific Islander	14	0.2%

Household income

Under $10k 2.2%

$10k–$15k 2.7%

$15k–$25k 1.0%

$25k–$35k 0.9%

$35k–$50k 2.3%

$50k–$75k 3.4%

$75k–$100k 1.9%

$100k–$150k 10.4%

$150k–$200k 7.0%

$200k+ 68.2%

Range	% of households
Under $10k	2.2%
$10k–$15k	2.7%
$15k–$25k	1.0%
$25k–$35k	0.9%
$35k–$50k	2.3%
$50k–$75k	3.4%
$75k–$100k	1.9%
$100k–$150k	10.4%
$150k–$200k	7.0%
$200k+	68.2%
Median income	$250,001

Housing

Home values

Under $50k 0.7%

$300k–$500k 0.2%

$500k–$1M 0.6%

$1M+ 98.5%

Housing overview

Metric	Value
Median home value	$2,000,000
Median rent / month	$3,501
Owner occupied	85.9%
Renter occupied	14.1%
Vacant	15.6%
Single-family detached	97.9%
Large apartment buildings	0.0%
Mobile homes	0.0%
Median rooms	10.0
Avg household size (owned)	2.97

Year built

Era	%
2020 or later	1.0%
2010–2019	10.9%
2000–2009	10.8%
1990–1999	6.1%
1980–1989	7.0%
1970–1979	3.7%
1960–1969	10.8%
1950–1959	22.1%
1940–1949	15.1%
1939 or earlier	12.6%

Bedrooms

Size	% of units
No bedroom (studio)	0.5%
1 bedroom	0.8%
2 bedrooms	3.4%
3 bedrooms	17.7%
4 bedrooms	34.7%
5+ bedrooms	43.0%

Vehicles per household

Vehicles	% of households
No vehicle	1.3%
1 vehicle	10.1%
2 vehicles	31.2%
3 or more	57.4%

Heating fuel

Fuel type	%
Utility gas	78.1%
Electricity	20.4%
Propane / LP gas	0.2%
Solar	1.0%
No fuel used	0.2%

Households & families

Household type	Count	%
Married-couple family	1,674	76.4%
Cohabiting couple	87	4.0%
Male householder, no spouse	118	5.4%
Female householder, no spouse	313	14.3%
Households with children under 18	732	33.4%
Households with seniors (65+)	1,075	49.0%
Average household size	2.97

Marital status

Status	Male	Female
Never married	39.3%	31.7%
Married	56.9%	58.0%
Separated	0.0%	2.1%
Widowed	1.3%	6.0%
Divorced	2.4%	2.3%

Education

Less than 9th grade 0.0%

Some HS, no diploma 0.5%

HS graduate 4.6%

Some college, no degree 5.1%

Associate's degree 3.7%

Bachelor's degree 29.1%

Graduate / professional 56.9%

Metric	%
HS diploma or higher	99.5%
Bachelor's or higher	86.0%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	83	3.4%
Kindergarten	34	1.4%
Elementary school	720	29.7%
High school	633	26.1%
College / grad school	952	39.3%

Employment

Industry of employment

Professional & management 24.6%

Education & healthcare 20.2%

Finance & real estate 20.0%

Manufacturing 10.3%

Arts, food & hospitality 6.9%

Information 6.3%

Retail trade 3.1%

Transportation & utilities 2.1%

Other services 2.1%

Construction 1.5%

Wholesale trade 1.4%

Public administration 1.1%

Agriculture & mining 0.2%

Occupation

Category	%
Management, business & arts	80.6%
Service	6.6%
Sales & office	11.3%
Natural resources & construction	0.4%
Production & transportation	1.1%

Employment type

Type	%
Private sector	85.3%
Government	4.6%
Self-employed	9.8%
Unpaid family workers	0.3%

Commute

Method	%
Drive alone	46.9%
Carpool	8.2%
Public transit	3.0%
Walk	2.3%
Other means	2.2%
Avg commute (minutes)	23.2

Poverty

All people 3.9%

Under 18 years 0.0%

18 and over 5.0%

Married-couple families 0.7%

Female-led households 0.0%

Income support

Source	% of households
Social Security	35.1%
Retirement income	23.5%
Supplemental Security	1.3%
Cash public assistance	0.5%
Food stamps / SNAP	0.0%

Health indicators

Condition	%
High blood pressure	28.7%
High cholesterol	36.9%
Heart disease	5.8%
Stroke	2.4%
Asthma	8.4%
Arthritis	22.6%
Kidney disease	2.7%
Pulmonary disease	4.5%
Cancer	8.6%

Behavior / access	%
Binge drinking	15.6%
No physical activity	12.7%
Less than 7 hrs sleep	24.7%
Fair or poor health	8.6%
Poor mental health	10.2%
Poor physical health	7.2%
No health insurance	4.9%
Visited doctor (checkup)	71.9%
Visited dentist	79.4%
Cholesterol screening	95.0%
Teeth loss	4.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	190	3.3%

Disability	%
Any disability	8.1%
Under 18	1.0%
18–64 years	3.2%
65 and over	25.2%

Health insurance coverage

Type	%
Private insurance	86.4%
Public insurance	26.0%
Uninsured under 19	1.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	7,019	98.3%
Spanish	279	4.0%
Other Indo-European	24	0.3%
Asian & Pacific Islander	54	0.8%
Other languages	201	2.9%

Place of birth & citizenship

Origin	Count	%
Native born (US)	5,663	79.3%
Born in same state	5,378	75.3%
Born in different state	3,063	42.9%
Foreign born	285	4.0%
Naturalized citizen	1,479	20.7%
Not a US citizen	829	56.1%

Ancestry

Ancestry	Count	%
French	889	12.4%
Italian	505	7.1%
Arab	212	3%
English	175	2.5%
Dutch	164	2.3%

Ancestry	Count	%
Polish	150	2.1%
Norwegian	102	1.4%
German	39	0.5%
Irish	29	0.4%

Technology access

Metric	% of households
Computer access	30.7%
Internet access	97.8%

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

Frequently asked questions

What is the ZIP code for Atherton, CA?

Atherton, CA has one ZIP code: 94027.

What is the main ZIP code for Atherton, CA?

The primary ZIP code for Atherton, CA is 94027. The city uses area code 650 for phone service.

What county is Atherton, CA in?

Atherton is located in San Mateo County, California.

How many ZIP codes are in Atherton, CA?

Atherton, CA has 1 ZIP code.

What is the ZIP code for downtown Atherton and the areas around Atherton Town Center?

Downtown Atherton and the Town Center area are located in ZIP code 94027, which serves as the primary ZIP code for all of Atherton, California.

What ZIP code should I use for mailing addresses to properties in the Atherton residential neighborhoods near Ringwood Drive and Fair Oaks Lane?

All residential neighborhoods in Atherton, including those near Ringwood Drive and Fair Oaks Lane, use the ZIP code 94027.