All Area Codes is your resource for looking up information about area codes and phone numbers in the white pages.
For looking up information on a specific phone number, the free reverse phone lookup
allows you to see the name and address of
phone numbers listed in the white pages of phone books throughout the US. For unlisted or cell phone
numbers, we provide a convenient price comparison of popular services that allow you to search deeper for
the owner of a phone number.
To find information on a specific area code, use the area code lookup that
makes it easy to find an area code by number and gives detailed information including city/state, timezone, and
area code maps. If you are looking for the area code for a particular city,
you can search area codes by city using our area code finder.
For international numbers, we also include Canadian area codes.
For dialing internationally, see the list of international dialing codes with
instructions on how to dial foreign numbers or dial U.S./Canadian number while traveling internationally.
In the US and its territories, Canada, and the Caribbean, the organization and allocation of telephone numbers is governed by the
North American Numbering Plan Administration (NANPA). The NANPA organizes the allocation of area codes and telephone prefixes to various phone companies.
The basic format of a phone number in any of these countries is NPA-NXX-XXXX or (NPA) NXX-XXX.
NPA codes are more commonly referred to as area codes. Some area codes are
reserved for special purposes. For instance, area code 800 (commonly referred to as 800-numbers) is reserved for toll free calls where the called party is charged instead
of the calling party. Also, not all area codes are currently in use. Only 316 of the possible 1000 area codes are currently being used.
The next three digits of a landline number or cellphone number are called the NXX. The NXX is also known as the prefix or exchange. Various telephone
carriers will reserve blocks of telephone numbers by reserving an NXX within an area code. Like area codes, not all prefixes are currently in use. Only 160,138 prefixes are currently used.
Finally, the final 4 digits of the phone number are known as the subscriber or local number. Based on the total number of active NPA and NXX combinations reserved and that each one
could have up to 10,000 possible subscriber numbers, the current total possible number of telephone numbers is 1,601,380,000. Based on the total
population of the US and Canada according to the US Census and the World Bank, that leaves 4 phone numbers for every person.
Remember though that phone numbers are no longer just used for standard home phones. Many telephone numbers are now used for fax machines, cell phones or wireless phones, or
internet connections so one person may actually need multiple phone lines.