What Are US Area Codes?
us area codes are the three-digit prefixes used in the North American Numbering Plan to route calls to specific geographic regions, states, cities, and service types in the United States. In a standard U.S. phone number such as (212) 555-0198, the area code is 212, which is associated with New York City. Area codes help phone networks identify where a number was originally assigned, although mobile phones, number portability, VoIP lines, and call spoofing can make the caller’s real location different from the area code shown.
If you receive a call from an unfamiliar U.S. number, the area code is a useful first clue. It can tell you whether the number appears to come from California, Texas, Florida, New York, or another state. For a deeper check, use Phone Number Lookup USA: Trace Any US Caller to look up caller identity signals, carrier information, location data, and spam indicators where available.
This state-by-state reference explains how U.S. area codes work, lists area codes by state and territory, and shows how to interpret unknown calls more accurately.
How us area codes work in the North American Numbering Plan
The United States uses country code +1 as part of the North American Numbering Plan, often shortened to NANP. NANP also includes Canada, many Caribbean countries, and several U.S. territories. A typical U.S. number is written in the format +1 NPA-NXX-XXXX:
- +1 is the country calling code for the United States and other NANP countries.
- NPA is the three-digit area code, such as 212, 305, 415, or 713.
- NXX is the central office or exchange code.
- XXXX is the final four-digit subscriber number.
Originally, area codes were strongly tied to landline regions. A person with a 212 number was very likely in Manhattan, and a 213 number usually meant Los Angeles. That relationship is less strict now. Mobile numbers can move with users, customers can keep their number when switching carriers, businesses may use VoIP numbers from another state, and scammers can spoof caller ID to display almost any area code.
Even with these limitations, area codes remain valuable for quick identification. They help you recognize likely geographic origins, detect suspicious mismatches, and decide whether a call deserves further investigation. For carrier-specific checks, SimOwnerApp also provides dedicated tools such as Verizon Phone Lookup: Identify Any Verizon Number, T-Mobile Phone Lookup: Check Any T-Mobile Caller, and AT&T Phone Number Lookup: Check Any AT&T Caller.
Complete list of us area codes by state
The list below groups active U.S. geographic area codes by state, district, and U.S. territory. Some area codes cover an entire state, while larger states can have dozens of codes because of population growth, mobile phone demand, business lines, and overlay plans.
Alabama to Georgia
- Alabama: 205, 251, 256, 334, 659, 938
- Alaska: 907
- Arizona: 480, 520, 602, 623, 928
- Arkansas: 327, 479, 501, 870
- California: 209, 213, 279, 310, 323, 341, 350, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 747, 760, 805, 818, 820, 831, 840, 858, 909, 916, 925, 949, 951
- Colorado: 303, 719, 720, 970, 983
- Connecticut: 203, 475, 860, 959
- Delaware: 302
- District of Columbia: 202, 771
- Florida: 239, 305, 321, 324, 352, 386, 407, 448, 561, 645, 656, 689, 727, 728, 754, 772, 786, 813, 850, 863, 904, 941, 954
- Georgia: 229, 404, 470, 478, 678, 706, 762, 770, 912, 943
Hawaii to Maryland
- Hawaii: 808
- Idaho: 208, 986
- Illinois: 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 861, 872
- Indiana: 219, 260, 317, 463, 574, 765, 812, 930
- Iowa: 319, 515, 563, 641, 712
- Kansas: 316, 620, 785, 913
- Kentucky: 270, 364, 502, 606, 859
- Louisiana: 225, 318, 337, 504, 985
- Maine: 207
- Maryland: 227, 240, 301, 410, 443, 667
Massachusetts to New Jersey
- Massachusetts: 339, 351, 413, 508, 617, 774, 781, 857, 978
- Michigan: 231, 248, 269, 313, 517, 586, 616, 734, 810, 906, 947, 989
- Minnesota: 218, 320, 507, 612, 651, 763, 924, 952
- Mississippi: 228, 601, 662, 769
- Missouri: 235, 314, 417, 557, 573, 636, 660, 816, 975
- Montana: 406
- Nebraska: 308, 402, 531
- Nevada: 702, 725, 775
- New Hampshire: 603
- New Jersey: 201, 551, 609, 640, 732, 848, 856, 862, 908, 973
New Mexico to Pennsylvania
- New Mexico: 505, 575
- New York: 212, 315, 329, 332, 347, 363, 516, 518, 585, 607, 624, 631, 646, 680, 716, 718, 838, 845, 914, 917, 929, 934
- North Carolina: 252, 336, 472, 704, 743, 828, 910, 919, 980, 984
- North Dakota: 701
- Ohio: 216, 220, 234, 283, 326, 330, 380, 419, 440, 513, 567, 614, 740, 937
- Oklahoma: 405, 539, 572, 580, 918
- Oregon: 458, 503, 541, 971
- Pennsylvania: 215, 223, 267, 272, 412, 445, 484, 570, 582, 610, 717, 724, 814, 835, 878
Rhode Island to Wyoming
- Rhode Island: 401
- South Carolina: 803, 821, 839, 843, 854, 864
- South Dakota: 605
- Tennessee: 423, 615, 629, 731, 865, 901, 931
- Texas: 210, 214, 254, 281, 325, 346, 361, 409, 430, 432, 469, 512, 682, 713, 726, 737, 806, 817, 830, 832, 903, 915, 936, 940, 945, 956, 972, 979
- Utah: 385, 435, 801
- Vermont: 802
- Virginia: 276, 434, 540, 571, 703, 757, 804, 826, 948
- Washington: 206, 253, 360, 425, 509, 564
- West Virginia: 304, 681
- Wisconsin: 262, 274, 414, 534, 608, 715, 920
- Wyoming: 307
U.S. territories in the +1 numbering plan
- American Samoa: 684
- Guam: 671
- Northern Mariana Islands: 670
- Puerto Rico: 787, 939
- U.S. Virgin Islands: 340
For nearby NANP countries, the same +1 dialing structure applies, but the number is not a U.S. number. If you are checking a Canadian caller, use Phone Number Lookup Canada: Find Any Canadian Caller. For callers outside North America, SimOwnerApp also supports lookups such as Phone Number Lookup UK: Identify Any UK Caller and Phone Number Lookup New Zealand: NZ Caller ID.
Major U.S. city area codes people search most
Many people search by city instead of state because large metropolitan areas often have several overlapping codes. These city codes are among the most commonly recognized:
- New York City: 212, 332, 347, 646, 718, 917, 929. Manhattan is strongly associated with 212, while 718 is widely associated with outer boroughs, but overlays now make the boundaries less simple.
- Los Angeles: 213, 310, 323, 424, 562, 626, 747, 818. The broader L.A. region uses several area codes across neighborhoods and surrounding cities.
- Chicago: 312, 773, 872, with nearby suburbs using 224, 331, 630, 708, and 847.
- Houston: 281, 346, 713, 832. These overlays cover much of the Houston metro area.
- Dallas-Fort Worth: 214, 469, 682, 817, 945, 972. These codes are often seen across North Texas.
- Miami: 305, 645, 786, with nearby South Florida also using 754 and 954.
- Atlanta: 404, 470, 678, 770, 943. The famous 404 code is now joined by multiple overlays.
- San Francisco Bay Area: 415, 628, 510, 341, 650, 925, 408, 669. The exact code depends on the city or county.
- Washington, DC: 202 and 771, while nearby Northern Virginia commonly uses 703 and 571, and Maryland suburbs use 301, 240, and 227.
- Boston: 617 and 857, with surrounding parts of Massachusetts using 339, 351, 508, 774, 781, and 978.
When you see a familiar city code, treat it as a clue rather than proof. A person can keep a New York number while living in California, and a scam caller can spoof a local-looking number to increase the chance that you answer.
Overlay area codes, splits, and why one city can have many codes
Older U.S. phone maps used area code splits. In a split, one region kept the old code while another region received a new code. This forced many customers to change their phone numbers, which was inconvenient for homes, businesses, printed materials, and public records.
Today, new codes are commonly added as overlays. An overlay places a new area code on top of the same geographic region as an existing code. For example, a city may have one original code and one or more overlay codes. New customers can receive any available code in that region, while existing customers keep their numbers.
Overlays are the reason ten-digit dialing is now common across the United States. If multiple area codes serve the same local calling area, callers must dial the area code plus the seven-digit number, even for nearby calls. This helps phone networks route calls correctly when the same seven-digit local number could exist under different area codes.
Examples of overlay regions include:
- Washington, DC: 771 overlays 202.
- New York City: multiple overlays operate across boroughs, including 332, 347, 646, 917, and 929 alongside older codes.
- Houston: 281, 346, 713, and 832 serve overlapping areas.
- Los Angeles: several overlays and nearby regional codes create a dense numbering map.
- Florida metro areas: Miami, Tampa, Orlando, Jacksonville, and South Florida have added overlays to meet number demand.
Non-geographic codes: toll-free, premium, and special numbers
Not every three-digit code in the +1 system points to a state or city. Some codes are used for special service categories, business routing, or national services.
- Toll-free numbers: 800, 833, 844, 855, 866, 877, and 888 are toll-free prefixes. Businesses, customer support centers, banks, airlines, and government agencies often use them.
- Premium-rate numbers: 900 numbers can involve paid services. Be cautious before calling back a 900 number, especially if the source is unknown.
- Emergency services: 911 is the emergency number in the United States and is not an area code.
- Information and local services: numbers such as 211, 311, 411, 511, 611, 711, and 811 are short service codes, not standard area codes.
- International-looking confusion: since NANP countries share +1, a number from Canada or the Caribbean can look similar to a U.S. number unless you check the exact area code.
Scammers sometimes use toll-free numbers or spoofed geographic codes to appear legitimate. A toll-free caller is not automatically safe, and a local-looking caller is not automatically local. If the call involves money, passwords, verification codes, banking access, tax claims, delivery fees, or threats, verify the caller through an official website or trusted contact number.
How to use us area codes when checking unknown callers
If you are researching us area codes because an unknown number called you, follow a simple verification process before calling back or sharing information.
- Check the area code first. Identify the state, city, or region the number appears to come from. If the area code is unfamiliar, compare it against the state list above.
- Look at the full number. The area code alone is not enough. The carrier, line type, spam reports, and calling pattern matter.
- Use a reverse lookup tool. Search the full number with a U.S. phone lookup tool to see available caller identity, carrier, location, and spam signals.
- Watch for spoofing clues. A local area code with a suspicious message, robotic voice, urgent demand, or unusual payment request may be spoofed.
- Do not call back high-risk numbers. Avoid returning calls from unknown premium-rate, international, or suspicious numbers unless you can verify them first.
- Block and report repeat spam. If the same caller keeps contacting you, block the number and report it to your carrier or relevant consumer protection agency.
Area codes can also help compare caller claims. For example, a supposed local bank branch calling from a distant state may deserve extra scrutiny. A shipping company, hospital, or school can use centralized call systems, so a mismatch does not always mean fraud, but it does mean you should verify through official channels.
Area code lookup tips for businesses, travelers, and families
U.S. area codes are useful beyond blocking spam. Businesses use them to understand customer regions, travelers use them to recognize local calls, and families use them to identify numbers from schools, clinics, workplaces, or service providers.
- For businesses: Area codes can help route leads, identify regional demand, and flag calls that appear inconsistent with customer records. Businesses should avoid relying on area code alone because many customers keep mobile numbers after moving.
- For travelers: A local-looking call may be from a hotel, airline, rideshare driver, restaurant, or event venue. Save key numbers before traveling so you can identify them quickly.
- For parents: Schools, childcare providers, sports teams, and medical offices may call from several numbers. Add trusted numbers to contacts when possible.
- For remote workers: Companies often use VoIP systems with numbers from headquarters, not the employee’s actual location.
- For online sellers: Area code mismatches can be one fraud signal, especially when combined with rushed payment requests, third-party pickup arrangements, or overpayment scams.
Area code formats vary by country. If you compare U.S. numbering with Australia, see Australia Area Codes Explained: 02, 03, 07, 08 Complete Guide. Australian geographic area codes work differently from the +1 NANP system, especially for landline regions and mobile prefixes.
Why area code location may not match the caller
A U.S. phone number’s area code usually shows where the number was first assigned, not where the person is standing. Several common reasons explain the mismatch:
- Mobile number portability: People can keep a phone number when changing carriers or moving to another state.
- VoIP services: Internet-based phone providers can issue numbers from many locations, regardless of the user’s physical address.
- Business call centers: A national company may route calls through centralized systems with numbers from one region.
- Remote work: Employees may use company numbers tied to headquarters while working elsewhere.
- Caller ID spoofing: Fraudsters can display a fake number to appear local, trusted, or official.
- Reassigned numbers: Phone numbers can be recycled after a customer gives them up, so old online references may point to the wrong person.
This is why a reliable lookup should consider more than the first three digits. Carrier details, line type, user reports, spam score, and recent activity signals can provide a clearer picture than area code location alone.
FAQs about us area codes
How many U.S. area codes are there?
The number changes as new overlays are introduced, but the United States has hundreds of geographic area codes across the 50 states, Washington, DC, and U.S. territories. Large states such as California, Texas, Florida, and New York have many area codes, while states such as Alaska, Maine, Montana, North Dakota, South Dakota, Vermont, and Wyoming currently use one primary geographic area code each.
Can an area code tell me exactly where someone is?
No. An area code can show where a number was originally assigned, but it cannot prove the caller’s current location. Mobile number portability, VoIP services, business call routing, and caller ID spoofing can all make the displayed location inaccurate.
What is the most famous U.S. area code?
Several area codes are widely recognized. 212 is strongly associated with Manhattan, 310 with parts of Los Angeles, 305 with Miami, 312 with Chicago, 404 with Atlanta, 415 with San Francisco, and 202 with Washington, DC. Popularity varies by culture, business use, and local identity.
Why do some states have only one area code?
States with smaller populations or lower phone-number demand may operate with one area code for many years. Examples include Alaska with 907, Delaware with 302, Maine with 207, Montana with 406, North Dakota with 701, South Dakota with 605, Vermont with 802, and Wyoming with 307.
What should I do if I receive a suspicious call from a local area code?
Do not trust the call simply because it looks local. Let unknown calls go to voicemail, search the full number with a lookup tool, avoid sharing verification codes or financial information, and contact the company or agency directly using an official number if the call claims to be urgent.