Call Union City, California, United States

To call Union City:

Dial: 1 X

If you are behind a switchboard, you may have to type first « 0 », « 9 » or another number to reach an external line. It may be the case if you are in a business office.

Number	Explanation
1	International dialing code used to dial to United States
X	Replace X with the local number you want to reach

If you are calling from within the United States, you don't have to use a country code to make an international call. Instead, you can just dial directly without any codes.

If the person you're calling got their phone number when they lived in Union City, their number might start with the area code 510.

Dial: 510 X

Number	Explanation
510	Local area code used to dial to Union City
X	Replace X with the local number you want to reach

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