San-Mateo Area Codes, California, Unites States
How to call San-Mateo, California?
San-Mateo has 1 area code. To call San-Mateo you need to dial the Unites States country code (+1) and the following area code:
650How to know if I'm receiving calls from San-Mateo, California?
You are receiving calls from San-Mateo when the phone number starts with the following combination:
1-650Other area codes in Unites States
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