United States
The United States (US) is identified internationally by the ISO 3166-1 codes: two-letter country code US and three-letter code USA. Its international calling code is +1, used when dialing US phone numbers from abroad. The country-code top-level domain (ccTLD) is .us, available for domain registration, while the US dollar (USD) serves as the national currency and a global reserve in financial and business contexts. These codes are essential for routing telecommunications, managing internet addresses, and executing cross-border transactions, making them fundamental for enterprises, travelers, and digital platforms operating within US markets.
- ISO alpha-2
- US
- ISO alpha-3
- USA
- ISO numeric
- 840
- ccTLD
- .us
- Currency
- USDUnited States dollar (USD)
- Region
- Americas
- Capital
- Washington D.C.
- Time zones
- America/New_York, America/Detroit, America/Kentucky/Louisville, America/Kentucky/Monticello, America/Indiana/Indianapolis, America/Indiana/Vincennes, America/Indiana/Winamac, America/Indiana/Marengo, America/Indiana/Petersburg, America/Indiana/Vevay, America/Chicago, America/Indiana/Tell_City, America/Indiana/Knox, America/Menominee, America/North_Dakota/Center, America/North_Dakota/New_Salem, America/North_Dakota/Beulah, America/Denver, America/Boise, America/Phoenix, America/Los_Angeles, America/Anchorage, America/Juneau, America/Sitka, America/Metlakatla, America/Yakutat, America/Nome, America/Adak, Pacific/Honolulu
- Postal format
- US : NNNNN[-NNNN]
How to call United States
From outside United States, dial your international access prefix, then +1, then the national number. Drop the leading trunk zero when the destination numbering plan requires it.
+1 [area or mobile code] [local number]