1 Country Code: United States (+1)
+1 is the country code for United States. If you searched "1 country code", "country code 1", "001 country code", or "+1 country code" — they all refer to United States. The code is also called the 1 dialing code, 1 phone code, or 1 ISD code, and is assigned by the International Telecommunication Union (ITU) under the E.164 standard.
The United States uses the North American Numbering Plan (NANP), shared with Canada and 18 Caribbean nations. Every US number is 10 digits — a 3-digit area code plus a 7-digit local number — and mobile numbers use the same area codes as landlines. When calling the US from abroad, dial +1 followed directly by the 10-digit number; there is no trunk prefix to remove.
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United States Phone Number Format
International Format Example
United States does not use a trunk prefix, so domestic and international formats are effectively the same — just prepend +1.
Major City Area Codes in United States
Area codes for the largest cities in United States. When dialing from abroad, prepend +1 and add no prefix.
| City / Region | Area Code | From Abroad |
|---|---|---|
| New York City | 212 | +1 212 |
| Los Angeles | 213 | +1 213 |
| Chicago | 312 | +1 312 |
| San Francisco | 415 | +1 415 |
| Miami | 305 | +1 305 |
| Washington DC | 202 | +1 202 |
Mobile Networks in United States
- No distinct prefix — mobiles and landlines share area codes
- Verizon
- AT&T
- T-Mobile
United States Telephone System Facts
Calling United States from Your Browser
To place a call to United States, dial +1 followed by the local number in the Kinvo browser dialer. Pay-as-you-go, no app required.
Call United States from Your Browser
Call any United States number (+1) directly from Chrome, Firefox, Safari, or Edge. No install required. Use it in under 2 minutes.
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Frequently Asked Questions: United States Country Code
Which country is country code 1?
Country code 1 belongs to United States. The full international dialing code is +1, also written as 001 when dialing from countries that use 00 as an international access code, or +1 when dialing from a mobile phone.
What is the country code for United States?
+1 is the international dialing code for United States, assigned by the ITU under E.164. The ISO 3166-1 alpha-2 code is US. Note: +1 is shared across the North American Numbering Plan (US, Canada, and 18 Caribbean nations), so the 3-digit area code after +1 determines the actual destination.
What are the main area codes in United States?
The largest cities in United States use these area codes: New York City (212), Los Angeles (213), Chicago (312), San Francisco (415). When calling from abroad, prepend +1.
Who are the main mobile carriers in United States?
The major mobile operators in United States are Verizon, AT&T, T-Mobile. Kinvo routes calls to every United States mobile carrier at the same per-minute rate — no hidden surcharges for premium networks.
What is the emergency number in United States?
The emergency services number in United States is 911. Emergency numbers cannot be dialed via Kinvo or any VoIP service — use a mobile network or landline for life-threatening emergencies.
Can I call United States from my browser?
Yes. Kinvo connects calls to United States via WebRTC directly from Chrome, Firefox, Safari, or Edge. No app download. Sign up, add credits from $5, and dial +1 followed by the local number.