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Further, local phone carriers frequently had a monopoly on local phone service which prevented large portions of an allocated block from being unutilized. In the s, cell phones became much more popular which created an explosion of demand for new phone numbers. Cell phones also reduced the monopoly of local phone providers which reduced utilization of allocated prefixes. Instead of a single primary phone carrier, cities had two or more carriers - each needing their own prefix.

In addition, the rise in popularity in the internet dial up and DSL and voice over IP VOIP , local interenet service providers and cable companies started to request prefixes. Many of these prefixes included few, if any, subscribers. For decades, new area codes were created through a "split" of an existing area code into multiple regions.

Normally, the more populated region would continue to use the existing area code. The less populated areas would have all existing phone numbers reassigned to use a new area code to free up more numbers in the original area code.

This process forced many into a new phone number which would require updates to letterhead, business cards, phone directories, personal contact lists, etc. Many people would dial the incorrect area code which caused confusion. In , area code was created as the first "overlay" area code.

With an overlay area code, the overlay serves the same geographic as the original to increase the pool of numbers available in the area. When the original phone systems were put in place, 7-digit dialing without the area code could be used to make local calls, and digit dialing with the area code only needed to be used for long distance calls.

In , area code was introduced as the first overlay with forced 10 digit dialing for local calls. Initially, there was substantial public resistance to overlays because of the digit dialing requirement for local calls. However, the last area code split in Canada was in with the split of splitting off and the last area code split in the US was in with splitting off No area code splits are currently proposed and both countries have agreed: without exceptional circumstances, all new area codes will be overlays.

Today, 7-digit dialing is broken in most major cities. Many areas not served by an overlay can still use 7-digit dialing. Something besides allocating more area codes needed to be done to improve the system. After a few trials, mandatory number pooling was implemented in with a national rollout to the largest metropolitan areas. With number pooling, an entire prefix of 10, numbers is allocated to a specific area, but phone numbers are only allocated to a specific carrier in 1, block increments.

While several US markets are still not required to implement number pooling and Canada has no number pooling, the effects dramatically slowed the need to allocate new prefixes and new area codes because of increased utilization.

The rate of issuing new area codes dropped to nearly half that of the s. While it may seem that all consumers in the US use a mobile phone, more than two-thirds of prefixes are allocated for landline use.

That number has been dropping by about 3. Not all area codes are assigned to a specific geographic area. One of the most common are toll-free area codes where the caller is not billed for long distance though wireless customers may have minutes deducted from their plan : , , , , , , and The area code is also currently used for premium services that are billed to the caller at higher than normal long distance rates.

In the s and and early s, numbers were frequently used to target children to run up phone bills, psychic hotlines, adult entertainment, computer help, etc.

Legislative protections in the s and the withdrawal of phone companies from passing these fees onto customers has largely killed the number industry. Other caller-pays area codes include , , , , , , , , and Though they see much less usage now, some are still used for dial-up modem access or security systems.

Area codes and are reserved for special telecommunications services and receive little usage. 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. If you are looking for the area code for a particular city, you can search area codes by city using our area code finder.

To browse all area codes, we have a list of all United States area codes by state and area codes by number. The area code list includes a printable copy that you can print and use for reference. 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.

Toggle navigation. Instant Phone Lookup Search Enter a phone number, area code, or city and state. Imagine a city block that makes up a typical census block as pictured to the right. It is bounded on all 4 sides by portions of city streets that each have their own name and addresses. The issue is that census blocks almost always split down the middle of the street.

ZIP codes rarely do because that would require two postal workers delivering mail to that street - one for each side of the street. In the example, one mail carrier may deliver to 3 sides of the block via one ZIP code while another mail carrier delivers mail on the other street in a different ZIP code.

When this happens, the Census Bureau will assign the entire block to a single ZCTA in this case, because the census block is the area that is precisely measured. If you are getting very precise usually a matter of meters, not miles , census block boundaries near the edge of a ZIP code almost always split ZIP codes. The statistics provided by the Census Bureau can give insight into the demographics within the ZIP code.

For instance, see our ZIP code rankings. Remember that ZIP codes were made to make mail delivery easier. They weren't made to correspond to existing boundaries such as cities, counties, or even states. If it is more efficient for a mail carrier to drive across a state line to deliver mail, the ZIP code "boundary" will cross the state lines. ZIP codes don't usually cross state lines, but some do , , and are good examples.

The edges of the boundaries commonly overlap. For the purposes of our free zip code database by county downloads, we will commonly list either the most common region for the ZIP code or list multiple regions if several exist in the ZIP code.

For cities, the assignment is somewhat more complicated. The assignment of cities to ZIP codes is more general. The city is usually the name of the main post office. For instance, almost all ZIP codes in St. Louis County in Missouri have a city of Saint Louis when they may be more accurately described as the name of a smaller city where they are located. Click here to learn more about matching ZIPs to cities and counties.

Toggle navigation. Search by ZIP, address, city, or county:. Featured In. Remote and especially rural areas of the country do not have enough deliverable addresses to create a mail route.

Without mail delivery, a ZIP is not needed. If you are looking to get off the grid, these areas are some of the most remote places within the country.