Zip Code 94509
Antioch, California — Contra Costa County
📍 ZIP code 94509 is in Antioch, Contra Costa County, California.
ZIP code 94509 is located in Antioch, Contra Costa County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 71,013. The area code for ZIP code 94509 is 408.
Quick Answer
Zip code 94509 is in Antioch, California (Contra Costa County). It has a population of 71,013, median household income of $81,512, and median home value of $565,300.
Population
71,013
Income
$81,512
Home Value
$565,300
Climate
91°F / 40°F
About Zip Code 94509
Zip code 94509 is located in Antioch, California, within Contra Costa County. Home to approximately 71,013 residents, this area sits at an elevation of 75 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 408.
The median household income is $81,512 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $565,300, and the cost of living index is 153 (53% above the national average of 100).
Summers average a high of 91°F while winters drop to 40°F. The area receives about 13 in of rain annually. The zip code covers 16.4 square miles of land area and 1.5 square miles of water.
Key Statistics
71,013
$81,512
$565,300
Pacific (PST/PDT)
408
75 ft
16.4 sq mi
37.6
24,048
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Compare With Nearby Zip Codes
| Metric | 94509 | 94565 | 94561 | 94517 | 94521 | 94513 |
|---|---|---|---|---|---|---|
| City | Antioch, CA | Pittsburg, CA | Oakley, CA | Clayton, CA | Concord, CA | Brentwood, CA |
| Population | 71,013 | 99,933 | 45,386 | 12,164 | 41,118 | 68,160 |
| Median Income | $81,512 | $95,035 | $130,859 | $164,860 | $127,312 | $139,736 |
| Home Value | $565,300 | $563,300 | $632,100 | $995,600 | $823,100 | $793,900 |
| Cost of Living | 153 | 162 | 195 | 250 | 232 | 229 |
| Median Age | 37.6 | 35 | 36.2 | 43.9 | 43 | 40.6 |
Cost of Living
100 = National Average. Antioch's cost of living is 53% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
6.9x
Demographics
Zip code 94509 has a population of 71,013 people with a median age of 37.6. There are 24,048 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Antioch (94509) population trend from 2010 to 2024
↑ 151.9%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
91°F
40°F
13 in
0 in
Antioch experiences hot summers with average highs around 91°F. Winters are mild with lows averaging 40°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$565,300
Median Household Income
$81,512
With 24,048 housing units across 16.4 square miles, 94509 has a housing density of 1,466 units per square mile. The home price-to-income ratio is 6.9x.
Location & Geography
Latitude
37.9965°
Longitude
-121.8123°
Land Area
16.4 sq mi
Water Area
1.5 sq mi
Nearby Zip Codes
Zip codes closest to 94509 (Antioch, CA) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 94509's $81,512. A way to compare Antioch to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 94509 (Antioch, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Antioch, California?
Antioch, California uses zip code 94509.
What county is zip code 94509 in?
Zip code 94509 is located in Contra Costa County, California.
What is the population of zip code 94509?
The population of zip code 94509 is 71,013 with a median age of 37.6.
Is 94509 in Antioch, California?
Yes, zip code 94509 is in Antioch, Contra Costa County, California. The area code is 408.
Frequently Asked Questions
What city is zip code 94509 in?
Zip code 94509 is in Antioch, California. It is part of Contra Costa County and uses the Pacific (PST/PDT) timezone.
What is zip code 94509?
Zip code 94509 is a U.S. postal code in Antioch, California (Contra Costa County). It has a population of 71,013 and covers 16.4 square miles.
What is the population of zip code 94509?
The population of zip code 94509 (Antioch, CA) is 71,013 with a median age of 37.6. There are approximately 24,048 housing units in this area.
What is the median income in zip code 94509?
The median household income in zip code 94509 (Antioch, CA) is $81,512 per year. The cost of living index is 153 (100 = national average).
What is the average home price in zip code 94509?
The median home value in zip code 94509 (Antioch, CA) is $565,300. The cost of living index is 153 compared to the national average of 100.
What county is zip code 94509 in?
Zip code 94509 is located in Contra Costa County, California. The primary city is Antioch.
What is the area code for zip code 94509?
Zip code 94509 in Antioch, CA uses area code 408. It is located in the Pacific (PST/PDT) timezone.
Is zip code 94509 a good place to live?
Zip code 94509 (Antioch, CA) has a cost of living index of 153 (100 = national average), a median household income of $81,512, and median home values of $565,300. The median age is 37.6. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 94509?
The cost of living index for zip code 94509 (Antioch, CA) is 153, where 100 represents the national average. This area is above the national average. Median home value: $565,300.
What schools serve zip code 94509?
Zip code 94509 in Antioch, California is served by the local school district of Contra Costa County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.