94531 ZIP Code — Antioch, CA
Contra Costa County, California
ZIP code 94531 is located in Antioch, California, within Contra Costa County. It covers approximately 14.03 square miles and serves a population of 44,115 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 925.
About ZIP code 94531
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 $624,900. Owner-occupancy sits near the national average at 72%.
Median household income is $115,300.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 49 minutes suggests many residents work outside the immediate area.
Educational attainment is near the national average, with 30% of residents holding a bachelor's degree or higher.
44,115
population
14.03
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
94531 ZIP code map
Cities in ZIP code 94531
Below are the cities the US Postal Service accepts for ZIP code 94531. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Antioch | Preferred |
Nearby ZIP codes
94509 Antioch (2.6 mi)
94513 Brentwood (4.8 mi)
94517 Clayton (6.4 mi)
94565 Pittsburg (8.6 mi)
94521 Concord (9.1 mi)
94561 Oakley (10.2 mi)
94505 Discovery Bay (11 mi)
94598 Walnut Creek (12 mi)
94519 Concord (12 mi)
94512 Birds Landing (12.2 mi)
94506 Danville (12.2 mi)
94514 Byron (12.3 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 44,115 |
| Population density | 3,144 / sq mi |
| State FIPS | 06 |
| County FIPS | 013 |
| Geography | |
|---|---|
| Land area | 14.03 sq mi |
| Water area | 0.00 sq mi |
| Latitude | 37.9566 |
| Longitude | -121.7852 |
| 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 | 19.0% | 23.2% | 32.6% |
| $50k – $100k | 29.3% | 25.1% | 27.7% |
| $100k – $200k | 39.5% | 31.3% | 26.4% |
| Over $200k | 12.1% | 20.4% | 13.3% |
Demographics & statistics
44,115
Population
3,144
People per sq mi
39.1
Median age
$115,300
Median household income
$42,729
Per capita income
$624,900
Median home value
$2,800
Median monthly rent
72.1%
Home ownership
8.0%
Poverty rate
6.9%
Unemployment
9,879
Housing units
30.0%
Bachelor's or higher
Age distribution
Male
Female
1,156
Under 5
1,294
1,203
5–9
1,348
1,298
10–14
1,453
1,505
15–19
1,685
1,344
20–24
1,506
3,014
25–34
3,375
2,716
35–44
3,041
2,728
45–54
3,055
1,644
55–59
1,842
1,497
60–64
1,676
1,744
65–74
1,952
658
75–84
737
304
85+
340
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 9,739 | 22.1% |
| 18 and over | 34,376 | 77.9% |
| 65 and over | 5,735 | 13.0% |
| Median age | 39.1 years | |
Race & ethnicity
White
25.7%
Black or African American
21.3%
Asian
17.6%
Hispanic or Latino
14.4%
Two or more races
10.4%
Other race
9.4%
Native Hawaiian / Pacific Islander
0.6%
American Indian / Alaska Native
0.5%
| Group | Count | % |
|---|---|---|
| White | 13,230 | 25.7% |
| Black or African American | 10,989 | 21.3% |
| Asian | 9,092 | 17.6% |
| Hispanic or Latino | 7,426 | 14.4% |
| Two or more races | 5,380 | 10.4% |
| Other race | 4,852 | 9.4% |
| Native Hawaiian / Pacific Islander | 313 | 0.6% |
| American Indian / Alaska Native | 259 | 0.5% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 19.0% | 23.2% | 32.6% |
| $50k – $100k | 29.3% | 25.1% | 27.7% |
| $100k – $200k | 39.5% | 31.3% | 26.4% |
| Over $200k | 12.1% | 20.4% | 13.3% |
Under $10k
0.8%
$10k–$15k
1.6%
$15k–$25k
2.8%
$25k–$35k
5.2%
$35k–$50k
8.4%
$50k–$75k
9.6%
$75k–$100k
13.8%
$100k–$150k
20.6%
$150k–$200k
14.6%
$200k+
22.5%
| Range | % of households |
|---|---|
| Under $10k | 0.8% |
| $10k–$15k | 1.6% |
| $15k–$25k | 2.8% |
| $25k–$35k | 5.2% |
| $35k–$50k | 8.4% |
| $50k–$75k | 9.6% |
| $75k–$100k | 13.8% |
| $100k–$150k | 20.6% |
| $150k–$200k | 14.6% |
| $200k+ | 22.5% |
| Median income | $115,300 |
Housing
Home values
Under $50k
0.5%
$50k–$100k
1.0%
$200k–$300k
1.3%
$300k–$500k
16.3%
$500k–$1M
78.4%
$1M+
2.5%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $624,900 |
| Median rent / month | $2,800 |
| Owner occupied | 72.1% |
| Renter occupied | 27.9% |
| Vacant | 2.5% |
| Single-family detached | 90.0% |
| Large apartment buildings | 4.0% |
| Mobile homes | 0.1% |
| Median rooms | 6.8 |
| Avg household size (owned) | 3.27 |
Year built
| Era | % |
|---|---|
| 2020 or later | 1.8% |
| 2010–2019 | 4.5% |
| 2000–2009 | 29.4% |
| 1990–1999 | 42.7% |
| 1980–1989 | 17.3% |
| 1970–1979 | 1.5% |
| 1960–1969 | 0.9% |
| 1950–1959 | 1.0% |
| 1940–1949 | 0.9% |
| 1939 or earlier | 0.1% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 1.1% |
| 1 bedroom | 4.0% |
| 2 bedrooms | 4.6% |
| 3 bedrooms | 34.5% |
| 4 bedrooms | 35.5% |
| 5+ bedrooms | 20.3% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 3.8% |
| 1 vehicle | 18.7% |
| 2 vehicles | 36.2% |
| 3 or more | 41.4% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 63.3% |
| Electricity | 27.7% |
| Propane / LP gas | 2.4% |
| Wood | 0.1% |
| Solar | 5.2% |
| No fuel used | 1.1% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 7,143 | 54.0% |
| Cohabiting couple | 945 | 7.1% |
| Male householder, no spouse | 1,560 | 11.8% |
| Female householder, no spouse | 3,585 | 27.1% |
| Households with children under 18 | 5,241 | 39.6% |
| Households with seniors (65+) | 3,934 | 29.7% |
| Average household size | 3.31 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 38.9% | 37.1% |
| Married | 50.5% | 43.0% |
| Separated | 0.7% | 1.3% |
| Widowed | 2.1% | 6.3% |
| Divorced | 7.9% | 12.2% |
Education
Less than 9th grade
5.1%
Some HS, no diploma
6.1%
HS graduate
22.9%
Some college, no degree
24.2%
Associate's degree
11.7%
Bachelor's degree
21.2%
Graduate / professional
8.9%
| Metric | % |
|---|---|
| HS diploma or higher | 88.8% |
| Bachelor's or higher | 30.0% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 551 | 4.9% |
| Kindergarten | 612 | 5.4% |
| Elementary school | 3,946 | 35.0% |
| High school | 2,622 | 23.2% |
| College / grad school | 3,549 | 31.5% |
Employment
Industry of employment
Education & healthcare
24.2%
Professional & management
13.2%
Retail trade
11.7%
Transportation & utilities
8.5%
Finance & real estate
8.0%
Arts, food & hospitality
7.6%
Public administration
6.6%
Manufacturing
5.8%
Construction
5.2%
Other services
5.0%
Information
2.2%
Wholesale trade
1.8%
Agriculture & mining
0.2%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 39.8% |
| Service | 17.9% |
| Sales & office | 24.5% |
| Natural resources & construction | 6.9% |
| Production & transportation | 10.9% |
Employment type
| Type | % |
|---|---|
| Private sector | 77.7% |
| Government | 17.2% |
| Self-employed | 4.7% |
| Unpaid family workers | 0.4% |
Commute
| Method | % |
|---|---|
| Drive alone | 65.0% |
| Carpool | 11.4% |
| Public transit | 7.4% |
| Walk | 0.9% |
| Work from home | 13.8% |
| Other means | 1.5% |
| Avg commute (minutes) | 49.3 |
Poverty
All people
8.0%
Under 18 years
10.5%
18 and over
7.3%
Married-couple families
2.0%
Female-led households
15.8%
Income support
| Source | % of households |
|---|---|
| Social Security | 29.4% |
| Retirement income | 26.0% |
| Supplemental Security | 8.6% |
| Cash public assistance | 6.8% |
| Food stamps / SNAP | 11.3% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 30.2% |
| High blood pressure | 24.8% |
| High cholesterol | 26.3% |
| Diabetes | 8.9% |
| Heart disease | 3.9% |
| Stroke | 2.2% |
| Asthma | 9.7% |
| Arthritis | 18.0% |
| Kidney disease | 2.2% |
| Pulmonary disease | 4.2% |
| Cancer | 4.3% |
| Behavior / access | % |
|---|---|
| Smoking | 11.5% |
| Binge drinking | 18.3% |
| No physical activity | 19.7% |
| Less than 7 hrs sleep | 34.0% |
| Depression | 16.0% |
| Fair or poor health | 12.5% |
| Poor mental health | 14.2% |
| Poor physical health | 8.6% |
| No health insurance | 11.4% |
| Visited doctor (checkup) | 64.5% |
| Visited dentist | 67.1% |
| Cholesterol screening | 90.8% |
| Teeth loss | 8.8% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 1,625 | 4.7% |
| Disability | % |
|---|---|
| Any disability | 14.0% |
| Under 18 | 6.3% |
| 18–64 years | 12.2% |
| 65 and over | 35.6% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 71.2% |
| Public insurance | 35.6% |
| No insurance | 4.2% |
| Uninsured under 19 | 1.8% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 41,665 | 94.4% |
| Spanish | 5,846 | 14.0% |
| Other Indo-European | 2,119 | 5.1% |
| Asian & Pacific Islander | 899 | 2.2% |
| Other languages | 2,718 | 6.5% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 33,318 | 75.5% |
| Born in same state | 32,747 | 74.2% |
| Born in different state | 25,715 | 58.3% |
| Foreign born | 571 | 1.3% |
| Naturalized citizen | 10,797 | 24.5% |
| Not a US citizen | 7,828 | 72.5% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 1,766 | 4% |
| French | 1,606 | 3.6% |
| Arab | 1,014 | 2.3% |
| Polish | 314 | 0.7% |
| English | 139 | 0.3% |
| Ancestry | Count | % |
|---|---|---|
| Irish | 94 | 0.2% |
| Dutch | 63 | 0.1% |
| German | 43 | 0.1% |
| Norwegian | 30 | 0.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 30.0% |
| Internet access | 98.8% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 94531
What city is ZIP code 94531 in?
ZIP code 94531 is primarily assigned to Antioch, California.
What county is ZIP code 94531 in?
ZIP code 94531 falls within Contra Costa County, California.
What is the typical home value in ZIP code 94531?
The median home value in ZIP code 94531 is $624,900.
What is the median household income in ZIP code 94531?
The median household income in ZIP code 94531 is $115,300, above the national median of ~$75,000.
What is the population of ZIP code 94531?
ZIP code 94531 has an estimated population of 44,115 residents, with a density of 3,145 people per square mile.
What timezone is ZIP code 94531 in?
ZIP code 94531 observes the PST timezone.