Network & carriers
The US shares +1 with Canada and 18+ Caribbean nations under the North American Numbering Plan (NANP) — the world's only country code covering multiple sovereign nations.
+1 · US · UTC-5
United States
Country Code & Virtual Numbers
The US anchors the world's largest single telecom market, sharing +1 with Canada and the Caribbean under the North American Numbering Plan. Capital: Washington D.C. · Business hours: 9:00 AM–5:00 PM EST.
// The Basics
What is the +1 country code?
Numbering format
US numbers use a 3-digit area code plus a 7-digit local number (10 digits total), with no leading digit to drop when dialing internationally.
Calling culture
Business calls are typically expected between 9 AM and 5 PM in the recipient's local time zone — the US spans six time zones, so confirm which one your contact is in before dialing.
Did you know
The 555 prefix, familiar from movies and TV, is reserved for fictional numbers and directory assistance — it was never assigned to real subscribers.
// Quick Facts
A quick read on United States numbers.
US numbers follow a strict 10-digit format — area code plus local number — with no variation across states, unlike many countries where code length changes by region.
Best time to call United States from the US
United States is on UTC-5 · Business hours = – EST · Mon–Fri
// Why a Virtual Number
Why get a United States virtual number?
A +1 virtual number gives your business instant local presence in United States — without the overhead.
Local caller ID in United States
When you call from your virtual United States number, contacts see a local +1 number — dramatically improving answer rates.
No office needed
Establish a local presence in United States without renting space, hiring locally, or installing any hardware.
Instant credibility
In a market of six time zones and fierce local competition, a familiar area code is often the difference between an answered call and a missed one.
Routes to any device
Calls to your United States number ring your team on mobile, desktop, or desk phone — wherever they work.
Free tools
Look up a number from United States
Phone number checkerCheck the country and format of a number from United States instantly.Phone number validatorValidate a number against its country's formatting rules (E.164).Carrier lookupCheck a number's country and format for free; live carrier data comes with the Lookup API.All country codesDialing codes, time zones and calling guides for every country.
Frequently Asked
United States questions answered.
Answers about dialing across six time zones, the NANP numbering system, and setting up a US virtual number.
Dial 011 (the US exit code), then 1, then the national number, leaving out any domestic trunk prefix (such as a leading 0).
Start calling United States, not tomorrow.
Get a virtual United States number or make direct international calls to +1 — active in under ten minutes.