United States Area Codes
Explore telephone area codes across all 56 states, provinces, and territories in United States. Find official dialing formats, geographic and overlay numbering codes, and reverse phone lookup guidelines.
Alabama AL
4 AreasArkansas AR
3 AreasCalifornia CA
22 AreasColorado CO
3 AreasConnecticut CT
2 AreasDistrict of Columbia DC
1 AreaFlorida FL
14 AreasGeorgia GA
6 AreasIllinois IL
8 AreasIndiana IN
6 AreasIowa IA
5 AreasKansas KS
4 AreasKentucky KY
4 AreasLouisiana LA
5 AreasMichigan MI
11 AreasMinnesota MN
7 AreasMissouri MO
6 AreasNew-Jersey NJ
6 AreasNew-Mexico NM
2 AreasNew York NY
10 AreasNorth Carolina NC
6 AreasOhio OH
8 AreasPennsylvania PA
7 AreasRhode Island RI
1 AreaSouth Carolina SC
3 AreasTennessee TN
6 AreasTexas TX
18 AreasVirginia VA
6 AreasWest Virginia WV
1 AreaAmerican Samoa AS
1 AreaPuerto Rico PR
1 AreaU.S. Virgin Islands VI
1 AreaNew Hampshire NH
1 AreaSouth Dakota SD
1 AreaNorth Dakota ND
1 AreaUnited States Dialing & Numbering Plan Guide
Telecommunications in United States operate under standardized geographic and mobile telephone numbering plans. Whether placing local domestic calls or international calls across borders, following the correct dialing syntax ensures seamless connection.
1. How to Call United States from Overseas (Inbound International Calls)
To call a landline or mobile telephone number in United States from outside the country, dial your local International Direct Dialing (IDD) exit code, followed by the United States country code (+1), the destination regional area code, and the 7-digit subscriber phone number:
2. Making International Outbound Calls from United States
When placing an outbound international call from United States to another country, initiate the call with the national exit code 011 (or hold the + key on smartphones), dial the recipient country's calling code, their regional city/area code, and their local subscriber phone number.
3. Domestic Dialing Rules & 10-Digit Mandatory Overlays
Within United States, telephone numbers consist of a 3-digit Area Code (NPA), a 3-digit Central Office Exchange prefix (NXX), and a 4-digit Line Number (XXXX). In modern telecommunications:
- 10-Digit Dialing: Due to area code overlay relief programs and the nationwide 988 Crisis Lifeline, virtually all regions now require mandatory 10-digit dialing (Area Code + 7-digit number) even for local residential calls.
- Area Code Overlays: When demand for new telephone numbers exceeds the capacity of an existing area code (approx. 7.9 million numbers), regulatory authorities introduce an overlay area code serving the identical geographic territory rather than splitting the region.
- Toll-Free Numbers: Area codes such as 800, 888, 877, 866, 855, 844, and 833 are non-geographic toll-free numbers accessible across the entire country free of charge.
4. Essential N11 Community Service Numbers
Short 3-digit telephone numbers are reserved nationwide for critical public safety, emergency, and municipal community services:
Caller ID Protection & Robocall Scams in United States
Phone scams and automated robocalls continue to target residents and businesses across United States. Scammers frequently exploit VoIP technology to perform neighbor spoofing, making incoming calls appear as though they originate from your local area code or municipal government.
Common Telephone Scams
Imposters claiming to represent tax authorities (IRS, CRA), law enforcement, utility companies, or computer technical support departments demanding immediate wire transfers, gift cards, or cryptocurrency.
How to Protect Yourself
Never share personal identification numbers, passwords, or verification codes over unsolicited phone calls. Check unknown phone numbers in PhoneArea360's community directory to read reports before calling back.
Frequently Asked Questions About United States Area Codes
What is the international calling code for United States?
The international calling code for United States is +1. To call United States from abroad, dial your local exit code (such as 00 or 011), followed by 1, the destination area code, and the 7-digit local phone number.
How are area codes assigned in United States?
Area codes are assigned to specific geographic territories, states, or metropolitan regions. In high-density population areas where phone number capacity is reached, overlay area codes are introduced that share the exact same territory.
Why do some cities in United States have multiple area codes?
Each 3-digit area code can support roughly 7.9 million telephone numbers. Fast-growing cities and mobile subscriber demand frequently exceed this capacity, requiring regulatory authorities to implement overlay area codes to provide fresh numbers without disrupting existing lines.
How do I identify who called me from a United States phone number?
You can perform a reverse telephone lookup using PhoneArea360's search directory. Simply enter the area code, exchange prefix, and line number to inspect the originating state, carrier routing details, and community spam activity ratings.
Reverse Lookup
Got an unexpected call or text? Look up any United States telephone number to review spam ratings and user reports.
Search Phone Number