What County Is Antioch, California In?
Antioch is in Contra Costa County, California.
- Official code
- 0602252
- Representative coordinates
- 37.978336, -121.796064
- Land area
- 75.556 km²
- Water area
- 1.993 km²
- State
- California
The representative point identifies this area. It is not a street address or a boundary survey.
County boundaries in Antioch
For a point close to the city or county boundary, check the address with the office responsible for your form. Check a point on the county map.
Coordinates of Antioch
37.978336, -121.796064 is the Census representative point, not a street address. Convert these coordinates or prepare a map link.
Elevation in Antioch
73 m · 240 ft. GNIS archived height at its named reference point (37.9786912, -121.7959902), which may differ from the Census point. Terrain height varies across the place; this is not a city-wide or surveyed elevation. Request height at a different point.
Today’s sunrise and sunset
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Approximate calculations at the representative coordinates, using a level horizon. Terrain and weather can change what you see.
Time zones in Antioch
The representative point uses America/Los_Angeles.
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/Los_Angeles | UTC-08:00 in January; UTC-07:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
94509 · 94513 · 94531 · 94561 · 94565
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
Before using this answer on a form
A city boundary, a CDP and a mailing city can mean different things.
Find the county at your current point, check its ZIP area, or find its physical time zone.