94505 ZIP Code — Discovery Bay, CA

Contra Costa County, California

ZIP code 94505 is located in Discovery Bay, California, within Contra Costa County. It covers approximately 16.67 square miles and serves a population of 15,445 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 925.

About ZIP code 94505

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 2000s, giving the area an established character. Median home value is $768,200. Owner-occupancy is high at 90%, well above the national average.

Median household income is $147,292. The poverty rate of 6% 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. An above-average commute of 44 minutes suggests many residents work outside the immediate area.

Educational attainment is near the national average, with 31% of residents holding a bachelor's degree or higher.

Overall, ZIP code 94505 reflects a community defined by high homeownership and a significant Social Security-dependent population.

15,445

population

16.67

sq mi land

Standard

ZIP type

Pacific (PT)

timezone

94505 ZIP code map

Cities in ZIP code 94505

Below are the cities the US Postal Service accepts for ZIP code 94505. Using any city not on this list may result in mail delivery delays.

City	Status
Discovery Bay	Acceptable
Discovery Bay	Preferred

Nearby ZIP codes

94514 Byron (5.3 mi) 94513 Brentwood (7.3 mi) 95391 Tracy (8.9 mi) 94531 Antioch (11 mi) 95206 Stockton (11.5 mi) 94551 Livermore (12.4 mi) 95219 Stockton (12.6 mi) 94561 Oakley (12.8 mi) 94509 Antioch (13.2 mi) 94517 Clayton (14.7 mi) 95203 Stockton (15.6 mi) 95330 Lathrop (16.2 mi)

Demographics updated 05/2026

Population
Total population	15,445
Population density	927 / sq mi
State FIPS	06
County FIPS	013

Geography
Land area	16.67 sq mi
Water area	5.79 sq mi
Latitude	37.8887
Longitude	-121.6020
Timezone	Pacific (PT)
Area code	925

Total population by age

Gender

Race & ethnicity

Economics updated 05/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.1%	23.2%	32.6%
$50k – $100k	19.9%	25.1%	27.7%
$100k – $200k	41.5%	31.3%	26.4%
Over $200k	23.5%	20.4%	13.3%

Demographics & statistics

15,445

Population

927

People per sq mi

44.0

Median age

$147,292

Median household income

$62,223

Per capita income

$768,200

Median home value

$2,859

Median monthly rent

89.9%

Home ownership

6.1%

Poverty rate

5.4%

Unemployment

5,449

Housing units

31.2%

Bachelor's or higher

Age distribution

Male Female

470

Under 5

466

431

5–9

429

454

10–14

450

616

15–19

611

374

20–24

371

874

25–34

867

776

35–44

771

1,269

45–54

1,261

520

55–59

516

601

60–64

597

759

65–74

754

447

75–84

444

159

85+

158

← Male

Female →

Age summary

Group	Count	%
Under 18	3,405	22.0%
18 and over	12,040	78.0%
65 and over	2,721	17.6%
Median age	44.0 years

Race & ethnicity

White 64.5%

Hispanic or Latino 9.6%

Two or more races 9.3%

Asian 6.7%

Black or African American 4.8%

Other race 4.4%

American Indian / Alaska Native 0.6%

Native Hawaiian / Pacific Islander 0.1%

Group	Count	%
White	11,019	64.5%
Hispanic or Latino	1,637	9.6%
Two or more races	1,596	9.3%
Asian	1,141	6.7%
Black or African American	823	4.8%
Other race	744	4.4%
American Indian / Alaska Native	110	0.6%
Native Hawaiian / Pacific Islander	12	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	15.1%	23.2%	32.6%
$50k – $100k	19.9%	25.1%	27.7%
$100k – $200k	41.5%	31.3%	26.4%
Over $200k	23.5%	20.4%	13.3%

Under $10k 2.8%

$10k–$15k 0.3%

$15k–$25k 3.1%

$25k–$35k 2.9%

$35k–$50k 4.0%

$50k–$75k 5.7%

$75k–$100k 10.3%

$100k–$150k 23.9%

$150k–$200k 13.3%

$200k+ 33.8%

Range	% of households
Under $10k	2.8%
$10k–$15k	0.3%
$15k–$25k	3.1%
$25k–$35k	2.9%
$35k–$50k	4.0%
$50k–$75k	5.7%
$75k–$100k	10.3%
$100k–$150k	23.9%
$150k–$200k	13.3%
$200k+	33.8%
Median income	$147,292

Housing

Home values

Under $50k 0.7%

$50k–$100k 0.3%

$150k–$200k 0.1%

$200k–$300k 0.2%

$300k–$500k 3.2%

$500k–$1M 77.1%

$1M+ 18.4%

Housing overview

Metric	Value
Median home value	$768,200
Median rent / month	$2,859
Owner occupied	89.9%
Renter occupied	10.1%
Vacant	8.7%
Single-family detached	90.9%
Large apartment buildings	1.0%
Mobile homes	0.1%
Median rooms	6.8
Avg household size (owned)	2.76

Year built

Era	%
2020 or later	0.7%
2010–2019	8.8%
2000–2009	31.0%
1990–1999	22.1%
1980–1989	26.3%
1970–1979	8.8%
1960–1969	0.6%
1950–1959	0.2%
1940–1949	0.3%
1939 or earlier	1.1%

Bedrooms

Size	% of units
No bedroom (studio)	0.2%
1 bedroom	0.6%
2 bedrooms	3.9%
3 bedrooms	42.8%
4 bedrooms	39.6%
5+ bedrooms	13.0%

Vehicles per household

Vehicles	% of households
No vehicle	2.4%
1 vehicle	20.5%
2 vehicles	36.1%
3 or more	41.0%

Heating fuel

Fuel type	%
Utility gas	73.9%
Electricity	21.6%
Propane / LP gas	0.5%
Fuel oil	0.1%
Wood	1.1%
Solar	2.7%

Households & families

Household type	Count	%
Married-couple family	3,556	64.9%
Cohabiting couple	353	6.4%
Male householder, no spouse	676	12.3%
Female householder, no spouse	897	16.4%
Households with children under 18	1,947	35.5%
Households with seniors (65+)	1,787	32.6%
Average household size	2.81

Marital status

Status	Male	Female
Never married	27.9%	23.2%
Married	62.4%	59.5%
Separated	0.4%	1.3%
Widowed	2.7%	3.6%
Divorced	6.5%	12.4%

Education

Less than 9th grade 0.5%

Some HS, no diploma 4.3%

HS graduate 19.6%

Some college, no degree 30.0%

Associate's degree 14.4%

Bachelor's degree 22.0%

Graduate / professional 9.2%

Metric	%
HS diploma or higher	95.2%
Bachelor's or higher	31.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	299	8.4%
Kindergarten	150	4.2%
Elementary school	1,208	34.1%
High school	983	27.8%
College / grad school	899	25.4%

Employment

Industry of employment

Education & healthcare 18.4%

Construction 14.2%

Professional & management 12.9%

Retail trade 11.5%

Finance & real estate 10.6%

Public administration 7.7%

Arts, food & hospitality 5.5%

Manufacturing 5.0%

Other services 4.9%

Transportation & utilities 3.9%

Wholesale trade 3.6%

Information 1.1%

Agriculture & mining 0.8%

Occupation

Category	%
Management, business & arts	45.1%
Service	14.2%
Sales & office	27.0%
Natural resources & construction	8.1%
Production & transportation	5.6%

Employment type

Type	%
Private sector	80.5%
Government	14.9%
Self-employed	4.5%
Unpaid family workers	0.1%

Commute

Method	%
Drive alone	67.4%
Carpool	12.1%
Public transit	1.1%
Walk	1.3%
Work from home	15.0%
Other means	3.1%
Avg commute (minutes)	44.0

Poverty

All people 6.1%

Under 18 years 10.8%

18 and over 4.8%

Married-couple families 2.2%

Female-led households 14.6%

Income support

Source	% of households
Social Security	33.0%
Retirement income	31.5%
Supplemental Security	2.8%
Cash public assistance	3.0%
Food stamps / SNAP	5.2%

Health indicators

Condition	%
Obesity	30.6%
High blood pressure	26.3%
High cholesterol	30.0%
Diabetes	8.4%
Heart disease	5.0%
Stroke	2.3%
Asthma	9.8%
Arthritis	22.0%
Kidney disease	2.4%
Pulmonary disease	5.5%
Cancer	6.0%

Behavior / access	%
Smoking	12.1%
Binge drinking	20.0%
No physical activity	17.1%
Less than 7 hrs sleep	31.2%
Depression	18.4%
Fair or poor health	11.7%
Poor mental health	14.2%
Poor physical health	9.2%
No health insurance	8.7%
Visited doctor (checkup)	64.7%
Visited dentist	71.0%
Cholesterol screening	92.2%
Teeth loss	7.8%

Veterans & disability

Veterans	Count	%
Civilian veterans	780	6.5%

Disability	%
Any disability	10.9%
Under 18	3.6%
18–64 years	9.7%
65 and over	24.3%

Health insurance coverage

Type	%
Private insurance	84.2%
Public insurance	27.2%
No insurance	5.3%
Uninsured under 19	9.8%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	14,509	93.9%
Spanish	273	1.9%
Other Indo-European	146	1.0%
Asian & Pacific Islander	40	0.3%
Other languages	87	0.6%

Place of birth & citizenship

Origin	Count	%
Native born (US)	14,013	90.7%
Born in same state	13,931	90.2%
Born in different state	10,837	70.2%
Foreign born	82	0.5%
Naturalized citizen	1,432	9.3%
Not a US citizen	1,032	72.1%

Ancestry

Ancestry	Count	%
Italian	1,852	12%
French	1,462	9.5%
Arab	375	2.4%
English	324	2.1%

Ancestry	Count	%
Polish	303	2%
Dutch	40	0.3%
German	27	0.2%
Norwegian	8	0.1%

Technology access

Metric	% of households
Computer access	35.5%
Internet access	99.4%

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

Frequently asked questions about ZIP code 94505

What city is ZIP code 94505 in?

ZIP code 94505 is primarily assigned to Discovery Bay, California.

What county is ZIP code 94505 in?

ZIP code 94505 falls within Contra Costa County, California.

Is ZIP code 94505 mostly owner-occupied?

90% of occupied units in ZIP code 94505 are owner-occupied, well above the national average.

What is the median household income in ZIP code 94505?

The median household income in ZIP code 94505 is $147,292, above the national median of ~$75,000.

What is the typical home value in ZIP code 94505?

The median home value in ZIP code 94505 is $768,200.

What is the population of ZIP code 94505?

ZIP code 94505 has an estimated population of 15,445 residents, with a density of 926 people per square mile.

What timezone is ZIP code 94505 in?

ZIP code 94505 observes the PST timezone.