94403 ZIP Code — San Mateo, CA

San Mateo County, California

ZIP code 94403 is located in San Mateo, California, within San Mateo County. It covers approximately 5.63 square miles and serves a population of 43,858 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 650.

About ZIP code 94403

The housing stock consists of a significant share of large multi-unit buildings. Most homes were built in the 1950s, giving the area an established character. Median home value is $1,681,500. Owner-occupancy sits near the national average at 53%.

The gap between median ($171,213) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 6% is below the national average.

The dominant occupation class is management, business, and professional, with professional and management as the leading industry. The average commute of 29 minutes is near the national average.

Educational attainment is high — 61% of residents hold a bachelor's degree or higher, well above the national average of 33%.

43,858

population

5.63

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

94403 ZIP code map

Cities in ZIP code 94403

Below are the cities the US Postal Service accepts for ZIP code 94403. Using any city not on this list may result in mail delivery delays.

City	Status
San Mateo	Preferred

Nearby ZIP codes

94402 San Mateo (1.4 mi) 94002 Belmont (1.9 mi) 94497 San Mateo (1.9 mi) 94404 San Mateo (2.1 mi) 94401 San Mateo (2.5 mi) 94065 Redwood City (3.2 mi) 94070 San Carlos (3.7 mi) 94010 Burlingame (4 mi) 94063 Redwood City (6 mi) 94061 Redwood City (6.4 mi) 94030 Millbrae (6.7 mi) 94128 San Francisco (6.9 mi)

Demographics updated 06/2026

Population
Total population	43,858
Population density	7,790 / sq mi
State FIPS	06
County FIPS	081

Geography
Land area	5.63 sq mi
Water area	0.16 sq mi
Latitude	37.5407
Longitude	-122.3042
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	16.5%	18.4%	32.6%
$50k – $100k	19.8%	20.5%	27.7%
$100k – $200k	30.2%	30.5%	26.4%
Over $200k	33.6%	30.6%	13.3%

Demographics & statistics

43,858

Population

7,790

People per sq mi

38.5

Median age

$171,213

Median household income

$84,786

Per capita income

$1,681,500

Median home value

$3,166

Median monthly rent

52.8%

Home ownership

6.1%

Poverty rate

5.1%

Unemployment

10,111

Housing units

61.1%

Bachelor's or higher

Age distribution

Male Female

1,285

Under 5

1,219

997

5–9

945

1,431

10–14

1,358

913

15–19

866

1,168

20–24

1,109

3,920

25–34

3,720

3,597

35–44

3,413

3,018

45–54

2,863

1,505

55–59

1,427

1,180

60–64

1,119

1,754

65–74

1,664

1,224

75–84

1,162

514

85+

487

← Male

Female →

Age summary

Group	Count	%
Under 18	8,526	19.4%
18 and over	35,332	80.6%
65 and over	6,805	15.5%
Median age	38.5 years

Race & ethnicity

White 38.4%

Asian 26.1%

Hispanic or Latino 14%

Other race 10.1%

Two or more races 8.3%

Black or African American 1.7%

American Indian / Alaska Native 0.8%

Native Hawaiian / Pacific Islander 0.6%

Group	Count	%
White	19,595	38.4%
Asian	13,303	26.1%
Hispanic or Latino	7,146	14%
Other race	5,160	10.1%
Two or more races	4,254	8.3%
Black or African American	847	1.7%
American Indian / Alaska Native	402	0.8%
Native Hawaiian / Pacific Islander	297	0.6%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	16.5%	18.4%	32.6%
$50k – $100k	19.8%	20.5%	27.7%
$100k – $200k	30.2%	30.5%	26.4%
Over $200k	33.6%	30.6%	13.3%

Under $10k 3.3%

$10k–$15k 0.7%

$15k–$25k 3.1%

$25k–$35k 3.2%

$35k–$50k 5.2%

$50k–$75k 7.3%

$75k–$100k 7.0%

$100k–$150k 14.9%

$150k–$200k 13.7%

$200k+ 41.7%

Range	% of households
Under $10k	3.3%
$10k–$15k	0.7%
$15k–$25k	3.1%
$25k–$35k	3.2%
$35k–$50k	5.2%
$50k–$75k	7.3%
$75k–$100k	7.0%
$100k–$150k	14.9%
$150k–$200k	13.7%
$200k+	41.7%
Median income	$171,213

Housing

Home values

Under $50k 0.7%

$50k–$100k 0.1%

$100k–$150k 0.4%

$150k–$200k 0.2%

$200k–$300k 0.2%

$300k–$500k 1.1%

$500k–$1M 12.9%

$1M+ 84.3%

Housing overview

Metric	Value
Median home value	$1,681,500
Median rent / month	$3,166
Owner occupied	52.8%
Renter occupied	47.2%
Vacant	7.5%
Single-family detached	48.4%
Large apartment buildings	22.8%
Mobile homes	0.0%
Median rooms	4.6
Avg household size (owned)	2.72

Year built

Era	%
2020 or later	0.0%
2010–2019	8.6%
2000–2009	5.8%
1990–1999	3.8%
1980–1989	8.2%
1970–1979	15.5%
1960–1969	13.2%
1950–1959	26.7%
1940–1949	13.4%
1939 or earlier	4.7%

Bedrooms

Size	% of units
No bedroom (studio)	6.3%
1 bedroom	19.1%
2 bedrooms	25.0%
3 bedrooms	33.3%
4 bedrooms	13.6%
5+ bedrooms	2.7%

Vehicles per household

Vehicles	% of households
No vehicle	5.9%
1 vehicle	32.7%
2 vehicles	42.2%
3 or more	19.2%

Heating fuel

Fuel type	%
Utility gas	62.2%
Electricity	32.8%
Propane / LP gas	2.0%
Fuel oil	0.2%
Solar	0.9%
No fuel used	2.0%

Households & families

Household type	Count	%
Married-couple family	9,247	55.7%
Cohabiting couple	903	5.4%
Male householder, no spouse	2,879	17.3%
Female householder, no spouse	3,583	21.6%
Households with children under 18	4,805	28.9%
Households with seniors (65+)	4,693	28.3%
Average household size	2.59

Marital status

Status	Male	Female
Never married	35.3%	27.3%
Married	57.2%	55.1%
Separated	0.5%	1.4%
Widowed	2.0%	7.8%
Divorced	5.1%	8.5%

Education

Less than 9th grade 3.5%

Some HS, no diploma 3.0%

HS graduate 10.9%

Some college, no degree 15.1%

Associate's degree 6.3%

Bachelor's degree 34.4%

Graduate / professional 26.8%

Metric	%
HS diploma or higher	93.5%
Bachelor's or higher	61.1%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	486	5.4%
Kindergarten	395	4.4%
Elementary school	3,847	42.8%
High school	1,907	21.2%
College / grad school	2,346	26.1%

Employment

Industry of employment

Professional & management 24.8%

Education & healthcare 20.2%

Manufacturing 9.0%

Retail trade 7.2%

Information 7.2%

Finance & real estate 6.7%

Arts, food & hospitality 6.6%

Transportation & utilities 5.1%

Other services 3.9%

Construction 3.7%

Public administration 2.8%

Wholesale trade 2.1%

Agriculture & mining 0.5%

Occupation

Category	%
Management, business & arts	62.4%
Service	11.0%
Sales & office	15.5%
Natural resources & construction	4.5%
Production & transportation	6.6%

Employment type

Type	%
Private sector	83.6%
Government	10.5%
Self-employed	5.8%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	58.3%
Carpool	7.4%
Public transit	8.2%
Walk	3.8%
Work from home	19.1%
Other means	3.2%
Avg commute (minutes)	28.5

Poverty

All people 6.1%

Under 18 years 5.1%

18 and over 6.3%

Married-couple families 2.2%

Female-led households 11.7%

Income support

Source	% of households
Social Security	23.3%
Retirement income	19.6%
Supplemental Security	2.9%
Cash public assistance	2.4%
Food stamps / SNAP	2.6%

Health indicators

Condition	%
Obesity	21.4%
High blood pressure	24.5%
High cholesterol	30.5%
Diabetes	8.0%
Heart disease	4.5%
Stroke	2.1%
Asthma	8.4%
Arthritis	18.0%
Kidney disease	2.3%
Pulmonary disease	4.0%
Cancer	6.0%

Behavior / access	%
Smoking	8.4%
Binge drinking	17.1%
No physical activity	15.5%
Less than 7 hrs sleep	28.1%
Depression	14.4%
Fair or poor health	9.8%
Poor mental health	11.8%
Poor physical health	7.3%
No health insurance	8.6%
Visited doctor (checkup)	67.2%
Visited dentist	73.1%
Cholesterol screening	92.6%
Teeth loss	6.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,218	3.4%

Disability	%
Any disability	9.1%
Under 18	4.8%
18–64 years	4.8%
65 and over	32.9%

Health insurance coverage

Type	%
Private insurance	83.6%
Public insurance	24.7%
No insurance	2.4%
Uninsured under 19	1.5%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	41,354	94.3%
Spanish	6,430	15.5%
Other Indo-European	2,101	5.1%
Asian & Pacific Islander	1,197	2.9%
Other languages	3,037	7.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	28,584	65.2%
Born in same state	27,824	63.4%
Born in different state	20,210	46.1%
Foreign born	760	1.7%
Naturalized citizen	15,274	34.8%
Not a US citizen	8,249	54.0%

Ancestry

Ancestry	Count	%
Italian	3,130	7.1%
French	2,511	5.7%
Arab	806	1.8%
Polish	726	1.7%
English	375	0.9%

Ancestry	Count	%
Dutch	184	0.4%
Irish	125	0.3%
German	78	0.2%
Norwegian	30	0.1%

Technology access

Metric	% of households
Computer access	37.9%
Internet access	97.3%

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

Frequently asked questions about ZIP code 94403

What city is ZIP code 94403 in?

ZIP code 94403 is primarily assigned to San Mateo, California.

What county is ZIP code 94403 in?

ZIP code 94403 falls within San Mateo County, California.

How educated is the population of ZIP code 94403?

61% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

What is the median household income in ZIP code 94403?

The median household income in ZIP code 94403 is $171,213, above the national median of ~$75,000.

What is the typical home value in ZIP code 94403?

The median home value in ZIP code 94403 is $1,681,500.

What is the population of ZIP code 94403?

ZIP code 94403 has an estimated population of 43,858 residents, with a density of 7,786 people per square mile.

What timezone is ZIP code 94403 in?

ZIP code 94403 observes the PST timezone.