94552 ZIP Code — Castro Valley, CA

Alameda County, California

ZIP code 94552 is located in Castro Valley, California, within Alameda County. It covers approximately 51.80 square miles and serves a population of 14,948 residents. This is a po box ZIP code in the Pacific (PT) timezone, served by area code 510/341.

About ZIP code 94552

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1990s, giving the area an established character. Median home value is $1,228,700. Owner-occupancy is high at 93%, well above the national average.

The gap between median ($204,260) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 5% is below the national average. 33% of households receive Social Security income, suggesting a notable retiree or disability population.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 34 minutes is near the national average. Remote work is prevalent — 21% of workers work from home.

Educational attainment is high — 60% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Overall, ZIP code 94552 reflects a community defined by a highly educated population, high homeownership, a high rate of remote workers, and a significant Social Security-dependent population.

14,948

population

51.80

sq mi land

PO Box

ZIP type

Pacific (PT)

timezone

94552 ZIP code map

Cities in ZIP code 94552

Below are the cities the US Postal Service accepts for ZIP code 94552. Using any city not on this list may result in mail delivery delays.

City	Status
Castro Valley	Acceptable
Castro Valley	Preferred

Nearby ZIP codes

94542 Hayward (4 mi) 94568 Dublin (4.1 mi) 94588 Pleasanton (4.4 mi) 94583 San Ramon (5.3 mi) 94544 Hayward (5.5 mi) 94541 Hayward (5.7 mi) 94582 San Ramon (6.1 mi) 94587 Union City (7.3 mi) 94566 Pleasanton (8 mi) 94578 San Leandro (8.1 mi) 94546 Castro Valley (8.2 mi) 94526 Danville (8.2 mi)

Demographics updated 06/2026

Population
Total population	14,948
Population density	289 / sq mi
State FIPS	06
County FIPS	001

Geography
Land area	51.80 sq mi
Water area	0.02 sq mi
Latitude	37.6953
Longitude	-121.9820
Timezone	Pacific (PT)
Area code	510/341

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	11.6%	24.6%	32.6%
$50k – $100k	10.7%	23.2%	27.7%
$100k – $200k	36.2%	30.5%	26.4%
Over $200k	41.5%	21.7%	13.3%

Demographics & statistics

14,948

Population

289

People per sq mi

48.8

Median age

$204,260

Median household income

$80,355

Per capita income

$1,228,700

Median home value

$3,501

Median monthly rent

92.5%

Home ownership

5.1%

Poverty rate

4.4%

Unemployment

4,692

Housing units

59.8%

Bachelor's or higher

Age distribution

Male Female

245

Under 5

270

342

5–9

378

529

10–14

585

445

15–19

491

288

20–24

319

657

25–34

727

775

35–44

857

976

45–54

1,079

629

55–59

694

807

60–64

891

922

65–74

1,018

342

75–84

378

144

85+

160

← Male

Female →

Age summary

Group	Count	%
Under 18	3,039	20.3%
18 and over	11,909	79.7%
65 and over	2,964	19.8%
Median age	48.8 years

Race & ethnicity

Asian 40.3%

White 38.4%

Two or more races 9.6%

Hispanic or Latino 5.9%

Black or African American 3.2%

Other race 2.3%

Native Hawaiian / Pacific Islander 0.3%

Group	Count	%
Asian	6,407	40.3%
White	6,103	38.4%
Two or more races	1,517	9.6%
Hispanic or Latino	931	5.9%
Black or African American	507	3.2%
Other race	364	2.3%
Native Hawaiian / Pacific Islander	48	0.3%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	11.6%	24.6%	32.6%
$50k – $100k	10.7%	23.2%	27.7%
$100k – $200k	36.2%	30.5%	26.4%
Over $200k	41.5%	21.7%	13.3%

Under $10k 4.0%

$10k–$15k 1.3%

$15k–$25k 1.6%

$25k–$35k 2.7%

$35k–$50k 1.3%

$50k–$75k 2.9%

$75k–$100k 6.1%

$100k–$150k 15.0%

$150k–$200k 13.3%

$200k+ 51.7%

Range	% of households
Under $10k	4.0%
$10k–$15k	1.3%
$15k–$25k	1.6%
$25k–$35k	2.7%
$35k–$50k	1.3%
$50k–$75k	2.9%
$75k–$100k	6.1%
$100k–$150k	15.0%
$150k–$200k	13.3%
$200k+	51.7%
Median income	$204,260

Housing

Home values

Under $50k 1.2%

$50k–$100k 0.6%

$100k–$150k 1.7%

$150k–$200k 0.1%

$200k–$300k 0.6%

$300k–$500k 0.4%

$500k–$1M 15.7%

$1M+ 79.6%

Housing overview

Metric	Value
Median home value	$1,228,700
Median rent / month	$3,501
Owner occupied	92.5%
Renter occupied	7.5%
Vacant	1.5%
Single-family detached	84.8%
Large apartment buildings	0.2%
Mobile homes	0.2%
Median rooms	7.0
Avg household size (owned)	2.98

Year built

Era	%
2020 or later	0.0%
2010–2019	0.1%
2000–2009	5.3%
1990–1999	38.9%
1980–1989	27.5%
1970–1979	11.4%
1960–1969	9.3%
1950–1959	3.8%
1940–1949	1.5%
1939 or earlier	2.2%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	0.2%
2 bedrooms	9.2%
3 bedrooms	23.2%
4 bedrooms	54.9%
5+ bedrooms	12.3%

Vehicles per household

Vehicles	% of households
No vehicle	0.7%
1 vehicle	13.8%
2 vehicles	43.8%
3 or more	41.8%

Heating fuel

Fuel type	%
Utility gas	76.3%
Electricity	14.7%
Propane / LP gas	5.3%
Fuel oil	0.2%
Wood	0.4%
Solar	1.6%

Households & families

Household type	Count	%
Married-couple family	3,672	73.5%
Cohabiting couple	186	3.7%
Male householder, no spouse	303	6.1%
Female householder, no spouse	832	16.7%
Households with children under 18	1,734	34.7%
Households with seniors (65+)	1,821	36.5%
Average household size	2.98

Marital status

Status	Male	Female
Never married	27.0%	24.8%
Married	66.8%	58.1%
Separated	1.8%	1.5%
Widowed	1.7%	10.4%
Divorced	2.6%	5.2%

Education

Less than 9th grade 3.0%

Some HS, no diploma 2.3%

HS graduate 9.6%

Some college, no degree 14.6%

Associate's degree 10.7%

Bachelor's degree 33.3%

Graduate / professional 26.6%

Metric	%
HS diploma or higher	94.7%
Bachelor's or higher	59.8%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	146	3.9%
Kindergarten	87	2.3%
Elementary school	1,484	39.9%
High school	979	26.3%
College / grad school	1,023	27.5%

Employment

Industry of employment

Education & healthcare 22.5%

Professional & management 18.6%

Retail trade 9.2%

Finance & real estate 8.7%

Manufacturing 7.9%

Transportation & utilities 7.7%

Public administration 6.5%

Arts, food & hospitality 6.1%

Construction 4.1%

Other services 3.3%

Information 3.2%

Wholesale trade 1.6%

Agriculture & mining 0.6%

Occupation

Category	%
Management, business & arts	63.5%
Service	10.5%
Sales & office	17.1%
Natural resources & construction	5.6%
Production & transportation	3.3%

Employment type

Type	%
Private sector	77.8%
Government	14.8%
Self-employed	7.3%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	64.7%
Carpool	7.3%
Public transit	5.3%
Walk	1.0%
Work from home	20.5%
Other means	1.1%
Avg commute (minutes)	34.0

Poverty

All people 5.1%

Under 18 years 6.7%

18 and over 4.7%

Married-couple families 1.0%

Female-led households 29.3%

Income support

Source	% of households
Social Security	32.7%
Retirement income	30.0%
Supplemental Security	5.6%
Cash public assistance	0.3%
Food stamps / SNAP	1.7%

Health indicators

Condition	%
Obesity	21.4%
High blood pressure	25.8%
High cholesterol	31.5%
Diabetes	8.4%
Heart disease	4.3%
Stroke	2.0%
Asthma	8.0%
Arthritis	17.9%
Kidney disease	2.1%
Pulmonary disease	3.8%
Cancer	5.7%

Behavior / access	%
Smoking	8.1%
Binge drinking	14.8%
No physical activity	14.3%
Less than 7 hrs sleep	27.6%
Depression	13.1%
Fair or poor health	9.0%
Poor mental health	11.0%
Poor physical health	6.9%
No health insurance	6.6%
Visited doctor (checkup)	67.2%
Visited dentist	71.0%
Cholesterol screening	94.3%
Teeth loss	5.5%

Veterans & disability

Veterans	Count	%
Civilian veterans	366	3.1%

Disability	%
Any disability	6.9%
Under 18	2.5%
18–64 years	5.6%
65 and over	15.3%

Health insurance coverage

Type	%
Private insurance	86.7%
Public insurance	23.4%
No insurance	2.4%
Uninsured under 19	4.4%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	14,433	96.6%
Spanish	1,744	12.1%
Other Indo-European	84	0.6%
Asian & Pacific Islander	229	1.6%
Other languages	1,341	9.3%

Place of birth & citizenship

Origin	Count	%
Native born (US)	10,320	69.0%
Born in same state	10,058	67.3%
Born in different state	7,728	51.7%
Foreign born	262	1.8%
Naturalized citizen	4,628	31.0%
Not a US citizen	3,894	84.1%

Ancestry

Ancestry	Count	%
Italian	855	5.7%
French	719	4.8%
Arab	373	2.5%
English	166	1.1%
Polish	141	0.9%

Ancestry	Count	%
German	90	0.6%
Dutch	53	0.4%
Norwegian	27	0.2%
Irish	11	0.1%

Technology access

Metric	% of households
Computer access	33.4%
Internet access	99.9%

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

Frequently asked questions about ZIP code 94552

What city is ZIP code 94552 in?

ZIP code 94552 is primarily assigned to Castro Valley, California.

What county is ZIP code 94552 in?

ZIP code 94552 falls within Alameda County, California.

Is ZIP code 94552 mostly owner-occupied?

93% of occupied units in ZIP code 94552 are owner-occupied, well above the national average.

How educated is the population of ZIP code 94552?

60% 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 94552?

The median household income in ZIP code 94552 is $204,260, above the national median of ~$75,000.

What is the typical home value in ZIP code 94552?

The median home value in ZIP code 94552 is $1,228,700.

What timezone is ZIP code 94552 in?

ZIP code 94552 observes the PST timezone.