Antioch, California
Antioch is a city in Contra Costa County, California, with an estimated population of 117,096 in 2023. It sits at 37.9783, -121.7961 in the America/Los_Angeles time zone.
| Field | Value |
|---|---|
| Place name | Antioch |
| Type | city |
| State | California (CA) |
| County | Contra Costa County |
| Population (2023 est.) | 117,096 |
| Land area | 29.17 sq mi (75.55 km²) |
| Coordinates | 37.9783, -121.7961 |
| Time zone | America/Los_Angeles |
| ZIP codes | 94509, 94531 |
| Telephone area codes | 925 |
ZIP codes and area codes for Antioch
Antioch covers 2 ZIP codes: 94509, 94531. Telephone area codes serving the area: 925. Browse all ZIP codes in California for the full list.
Where is Antioch?
Antioch is located in California, in Contra Costa County. The coordinates above can be pasted directly into any map service. The nearest indexed places are listed below, which is a useful check when two states share a place name.
Nearby places
Brentwood 8 km · CAOakley 9 km · CAPittsburg 10 km · CAClayton 12 km · CAConcord 18 km · CAWalnut Creek 23 km · CARio Vista 23 km · CADanville 24 km · CA
Other places in Contra Costa County
Concord 122,315Richmond 114,106San Ramon 84,929Pittsburg 75,803Walnut Creek 69,152Brentwood 65,126Oakley 45,761Danville 42,999Martinez 36,395Pleasant Hill 33,802
Frequently asked questions
What county is Antioch, CA in?
Antioch is in Contra Costa County, California.
What is the population of Antioch, CA?
The 2023 Census Bureau estimate is 117,096.
What time zone is Antioch in?
Antioch is in the America/Los_Angeles time zone.