What is an area code?
An area code is the three-digit code at the start of a North American phone number that identifies a geographic numbering area, such as a city or part of a state. It does not identify a person, a business, or the exact location of a phone.
What the three digits mean
In the North American Numbering Plan, a phone number has three parts: the area code, a three-digit exchange, and a four-digit line number. The area code routes the call to a broad region first, and the rest of the number then routes it to a specific line within that region. For example, 212 identifies Manhattan in New York City, while 602 identifies the Phoenix area in Arizona. Neither code covers a whole state, and neither code by itself tells you who is calling. The code page for each code gives its region, state, time zone, and overlay group, which is the reliable way to read what a code means.
Splits and overlays
Area codes change when a region runs short of numbers. In a split, part of a region keeps the old code and another part gets a new one, so existing numbers in the split-off part change. In an overlay, a new code is added for the same region as an old code, so existing numbers keep their code but new numbers in the same area can carry either code. Overlays are now the more common pattern, and they are the reason ten-digit dialing is required in many areas: when two codes serve the same place, the area code must be dialled even for a local call. The area code overlays guide (/area-code-overlays/) explains this in full, with Batch 1 examples.
What a code does not tell you
An area code is a numbering area, not a tracking device. It does not show where a phone is at the moment, because a number can be kept when its owner moves, and it can be used with internet calling from anywhere. Caller ID can also be spoofed, so a familiar code on the screen is not proof of who is calling. This site therefore treats every code as a region label only. It does not offer reverse lookup, it does not identify callers or phone owners, and it does not list reported spam numbers. The general spoofing note on each code page gives the same warning in short form.
How to use this site for a code
If you have a full phone number, enter it in the area code finder (/what-area-code-is-this/): the tool uses only the first three digits and returns the region, state, and time zone, with a link to the code page when the page exists. If you know the code, go straight to its page from the area codes list (/area-codes-list/) or the by-state directory (/area-codes-by-state/). If the code is not listed yet, the finder will say it is not in the database yet, rather than guessing a region for it.
Frequently asked questions
Is an area code the same as a zip code?
No. A zip code is a postal area, while an area code is a telephone numbering area. They often cover different boundaries, even in the same city.
Can two cities share one area code?
Yes. One code can cover several cities and counties, and one city can have several codes when overlays exist. The code page, not the city name alone, shows which region a code covers.
Does an area code change when someone moves?
Not necessarily. A person or business can often keep a number after moving, so the code shows where the number was originally assigned, not where the phone is now.
Why do some places need ten-digit dialing?
Because an overlay adds a second code for the same area. When two codes serve one place, the area code must be dialled for local calls too, so the network knows which code is meant.
Sources: NANPA Area Code Search tool; NANPA planning letters cited on the Batch 1 code pages.
Based on a recent search of NANPA and official sources.
This website provides general information about North American area codes, compiled from public sources including NANPA. It is not affiliated with or endorsed by the FCC, NANPA or any telephone carrier. Area code details can change; confirm with your carrier or the official NANPA website. This site does not identify callers or phone owners.