How to call United States from Italy

00 - 1 - phone number

001 and +1 are used interchangeably to dial US phone numbers from a mobile (more on the plus sign).

Current time in Washington DC, United States:

This country uses multiple time zones

Area codes & number examples

Location	Dialing format	Or using +
All areas	00 1 xxx xxx xxxx	+1 xxx xxx xxxx

More info:

Area code locator - Find the area code for a US city or browse codes to see their locations
Official area code maps - from the North American Numbering Plan Administrator
Lincmad's - comprehensive maps and tables

Phone books and visitor guides:

Yelp - business listings and reviews
White Pages - people and business search

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Knowledge base

Traveling to United States?