94509 ZIP Code — Antioch, CA
Contra Costa County, California
ZIP code 94509 is located in Antioch, California, within Contra Costa County. It covers approximately 17.44 square miles and serves a population of 70,889 residents. This is a standard ZIP code in the Pacific (PT) timezone, served by area code 925.
About ZIP code 94509
The housing stock consists of a mix of housing types. Most homes were built in the 1970s, giving the area an established character. Median home value is $516,200. Owner-occupancy sits near the national average at 56%.
Median household income is $78,637. 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 42 minutes suggests many residents work outside the immediate area.
College attainment at 18% is below the national average, consistent with a trades and production-oriented local economy.
Overall, ZIP code 94509 reflects a community defined by a trades-oriented workforce and a significant Social Security-dependent population.
70,889
population
17.44
sq mi land
Standard
ZIP type
Pacific (PT)
timezone
94509 ZIP code map
Cities in ZIP code 94509
Below are the cities the US Postal Service accepts for ZIP code 94509. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Antioch | Preferred |
Nearby ZIP codes
94531 Antioch (2.6 mi)
94565 Pittsburg (6.7 mi)
94513 Brentwood (7.4 mi)
94517 Clayton (7.5 mi)
94521 Concord (8.1 mi)
94561 Oakley (9.6 mi)
94512 Birds Landing (9.7 mi)
94519 Concord (10.6 mi)
94598 Walnut Creek (11.9 mi)
94518 Concord (12 mi)
94529 Concord (12.2 mi)
94520 Concord (12.5 mi)
Demographics
updated 06/2026
| Population | |
|---|---|
| Total population | 70,889 |
| Population density | 4,065 / sq mi |
| State FIPS | 06 |
| County FIPS | 013 |
| Geography | |
|---|---|
| Land area | 17.44 sq mi |
| Water area | 0.23 sq mi |
| Latitude | 37.9898 |
| Longitude | -121.8073 |
| Timezone | Pacific (PT) |
| Area code | 925 |
Total population by age
Gender
Race & ethnicity
Economics
updated 06/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 34.8% | 23.2% | 32.6% |
| $50k – $100k | 35.0% | 25.1% | 27.7% |
| $100k – $200k | 23.6% | 31.3% | 26.4% |
| Over $200k | 6.6% | 20.4% | 13.3% |
Demographics & statistics
70,889
Population
4,065
People per sq mi
36.4
Median age
$78,637
Median household income
$34,259
Per capita income
$516,200
Median home value
$2,011
Median monthly rent
55.5%
Home ownership
14.7%
Poverty rate
8.5%
Unemployment
13,519
Housing units
18.4%
Bachelor's or higher
Age distribution
Male
Female
2,224
Under 5
2,423
2,136
5–9
2,327
2,366
10–14
2,577
2,565
15–19
2,795
2,200
20–24
2,396
4,779
25–34
5,205
4,562
35–44
4,970
3,850
45–54
4,194
2,361
55–59
2,571
2,224
60–64
2,422
3,198
65–74
3,484
1,113
75–84
1,212
352
85+
383
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 17,605 | 24.8% |
| 18 and over | 53,284 | 75.2% |
| 65 and over | 9,742 | 13.7% |
| Median age | 36.4 years | |
Race & ethnicity
White
28%
Hispanic or Latino
22.8%
Other race
15.9%
Black or African American
12.5%
Two or more races
11%
Asian
7.3%
American Indian / Alaska Native
1.3%
Native Hawaiian / Pacific Islander
1.3%
| Group | Count | % |
|---|---|---|
| White | 25,759 | 28% |
| Hispanic or Latino | 20,951 | 22.8% |
| Other race | 14,557 | 15.9% |
| Black or African American | 11,457 | 12.5% |
| Two or more races | 10,103 | 11% |
| Asian | 6,689 | 7.3% |
| American Indian / Alaska Native | 1,173 | 1.3% |
| Native Hawaiian / Pacific Islander | 1,151 | 1.3% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 34.8% | 23.2% | 32.6% |
| $50k – $100k | 35.0% | 25.1% | 27.7% |
| $100k – $200k | 23.6% | 31.3% | 26.4% |
| Over $200k | 6.6% | 20.4% | 13.3% |
Under $10k
4.3%
$10k–$15k
3.6%
$15k–$25k
5.5%
$25k–$35k
7.5%
$35k–$50k
10.8%
$50k–$75k
15.3%
$75k–$100k
13.9%
$100k–$150k
18.2%
$150k–$200k
9.5%
$200k+
11.4%
| Range | % of households |
|---|---|
| Under $10k | 4.3% |
| $10k–$15k | 3.6% |
| $15k–$25k | 5.5% |
| $25k–$35k | 7.5% |
| $35k–$50k | 10.8% |
| $50k–$75k | 15.3% |
| $75k–$100k | 13.9% |
| $100k–$150k | 18.2% |
| $150k–$200k | 9.5% |
| $200k+ | 11.4% |
| Median income | $78,637 |
Housing
Home values
Under $50k
1.1%
$50k–$100k
1.5%
$100k–$150k
1.7%
$150k–$200k
3.5%
$200k–$300k
4.8%
$300k–$500k
34.4%
$500k–$1M
51.2%
$1M+
1.7%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $516,200 |
| Median rent / month | $2,011 |
| Owner occupied | 55.5% |
| Renter occupied | 44.5% |
| Vacant | 2.8% |
| Single-family detached | 69.7% |
| Large apartment buildings | 9.4% |
| Mobile homes | 1.8% |
| Median rooms | 5.4 |
| Avg household size (owned) | 2.91 |
Year built
| Era | % |
|---|---|
| 2020 or later | 0.3% |
| 2010–2019 | 2.7% |
| 2000–2009 | 5.8% |
| 1990–1999 | 11.2% |
| 1980–1989 | 18.5% |
| 1970–1979 | 25.7% |
| 1960–1969 | 13.7% |
| 1950–1959 | 11.2% |
| 1940–1949 | 7.3% |
| 1939 or earlier | 3.6% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 2.2% |
| 1 bedroom | 8.8% |
| 2 bedrooms | 24.1% |
| 3 bedrooms | 38.7% |
| 4 bedrooms | 23.4% |
| 5+ bedrooms | 2.7% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 5.9% |
| 1 vehicle | 27.4% |
| 2 vehicles | 33.6% |
| 3 or more | 33.2% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 62.3% |
| Electricity | 31.6% |
| Propane / LP gas | 2.1% |
| Fuel oil | 0.2% |
| Wood | 0.4% |
| Solar | 1.3% |
| No fuel used | 2.0% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 10,351 | 44.7% |
| Cohabiting couple | 1,950 | 8.4% |
| Male householder, no spouse | 4,011 | 17.3% |
| Female householder, no spouse | 6,854 | 29.6% |
| Households with children under 18 | 8,906 | 38.4% |
| Households with seniors (65+) | 7,292 | 31.5% |
| Average household size | 3.04 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 43.2% | 35.9% |
| Married | 42.9% | 41.8% |
| Separated | 2.1% | 2.3% |
| Widowed | 3.1% | 7.8% |
| Divorced | 8.7% | 12.1% |
Education
Less than 9th grade
7.6%
Some HS, no diploma
8.8%
HS graduate
29.6%
Some college, no degree
26.3%
Associate's degree
9.4%
Bachelor's degree
14.3%
Graduate / professional
4.0%
| Metric | % |
|---|---|
| HS diploma or higher | 83.6% |
| Bachelor's or higher | 18.4% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 740 | 4.1% |
| Kindergarten | 1,125 | 6.3% |
| Elementary school | 7,521 | 42.1% |
| High school | 4,202 | 23.5% |
| College / grad school | 4,295 | 24.0% |
Employment
Industry of employment
Education & healthcare
24.7%
Professional & management
13.3%
Construction
10.9%
Retail trade
10.9%
Arts, food & hospitality
9.8%
Transportation & utilities
6.6%
Manufacturing
5.9%
Other services
5.7%
Finance & real estate
5.0%
Public administration
4.2%
Wholesale trade
1.2%
Information
1.1%
Agriculture & mining
0.6%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 30.2% |
| Service | 26.2% |
| Sales & office | 20.9% |
| Natural resources & construction | 10.9% |
| Production & transportation | 11.9% |
Employment type
| Type | % |
|---|---|
| Private sector | 76.9% |
| Government | 14.4% |
| Self-employed | 8.7% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 65.8% |
| Carpool | 15.1% |
| Public transit | 6.3% |
| Walk | 2.1% |
| Work from home | 8.6% |
| Other means | 2.1% |
| Avg commute (minutes) | 42.1 |
Poverty
All people
14.7%
Under 18 years
21.8%
18 and over
12.4%
Married-couple families
7.1%
Female-led households
25.2%
Income support
| Source | % of households |
|---|---|
| Social Security | 32.8% |
| Retirement income | 26.3% |
| Supplemental Security | 8.8% |
| Cash public assistance | 4.9% |
| Food stamps / SNAP | 14.7% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 34.7% |
| High blood pressure | 28.7% |
| High cholesterol | 28.1% |
| Diabetes | 11.0% |
| Heart disease | 5.7% |
| Stroke | 3.1% |
| Asthma | 10.9% |
| Arthritis | 22.6% |
| Kidney disease | 3.0% |
| Pulmonary disease | 7.0% |
| Cancer | 5.2% |
| Behavior / access | % |
|---|---|
| Smoking | 15.5% |
| Binge drinking | 18.1% |
| No physical activity | 25.2% |
| Less than 7 hrs sleep | 34.4% |
| Depression | 18.9% |
| Fair or poor health | 18.7% |
| Poor mental health | 16.5% |
| Poor physical health | 12.1% |
| No health insurance | 15.9% |
| Visited doctor (checkup) | 64.5% |
| Visited dentist | 58.5% |
| Cholesterol screening | 88.5% |
| Teeth loss | 14.1% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 3,261 | 6.1% |
| Disability | % |
|---|---|
| Any disability | 16.0% |
| Under 18 | 4.7% |
| 18–64 years | 15.7% |
| 65 and over | 38.4% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 59.9% |
| Public insurance | 45.3% |
| No insurance | 7.8% |
| Uninsured under 19 | 5.0% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 66,242 | 93.4% |
| Spanish | 9,317 | 14.1% |
| Other Indo-European | 7,221 | 10.9% |
| Asian & Pacific Islander | 372 | 0.6% |
| Other languages | 1,697 | 2.6% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 55,835 | 78.8% |
| Born in same state | 54,586 | 77.0% |
| Born in different state | 46,105 | 65.0% |
| Foreign born | 1,249 | 1.8% |
| Naturalized citizen | 15,054 | 21.2% |
| Not a US citizen | 7,576 | 50.3% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 4,133 | 5.8% |
| French | 2,759 | 3.9% |
| Arab | 1,107 | 1.6% |
| Polish | 583 | 0.8% |
| English | 293 | 0.4% |
| Ancestry | Count | % |
|---|---|---|
| German | 178 | 0.3% |
| Dutch | 129 | 0.2% |
| Irish | 42 | 0.1% |
| Norwegian | 12 | 0% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 32.7% |
| Internet access | 96.1% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 94509
What part of Antioch is ZIP code 94509?
ZIP code 94509 covers a portion of Antioch, California, within Contra Costa County.
What county is ZIP code 94509 in?
ZIP code 94509 falls within Contra Costa County, California.
What is the typical home value in ZIP code 94509?
The median home value in ZIP code 94509 is $516,200.
What is the population of ZIP code 94509?
ZIP code 94509 has an estimated population of 70,889 residents, with a density of 4,064 people per square mile.
What is the median household income in ZIP code 94509?
The median household income in ZIP code 94509 is $78,637, above the national median of ~$75,000.
What timezone is ZIP code 94509 in?
ZIP code 94509 observes the PST timezone.