Search by ZIP, address, city, or county:
About US ZIP Codes
US ZIP codes are a type of postal code used within the United States to help the United States Postal Service ( USPS ) route mail more efficiently. ZIP code near me are shown on the map above. Some hush refer to ZIP codes as US postal codes. The term ZIP stands for Zone Improvement Plan. The basic 5-digit format was first base introduced in 1963 and former extended to add an extra 4 digits after a dash to form a ZIP+4 code. The extra 4 digits help USPS more precisely group mail for delivery. Though ZIP codes were primitively developed for USPS, many other shipping companies such as United Parcel Service ( UPS ), Federal Express ( FedEx ), DHL, and others make use of ZIP codes for sorting packages and calculating the fourth dimension and cost of shipping a software ( the transportation rate ) .
Types of Zip Codes
- Unique/single high volume address (ex. 20505 for the CIA in Washington, DC)
- PO Box only (ex. 22313 for the PO Boxes of Alexandria, VA)
- Standard (all other ZIP codes)
Assignment of ZIP codes and Mail Sorting
The first digit of a USA ZIP code generally represents a group of U.S. states. The map of the beginning finger of energy codes above shows they are assigned in club from the north east to the west coast. The first 3 digits of a ZIP code determine the central chain mail action facility, besides called sectional focus on facility or “ second center ”, that is used to process and sort mail. All chain mail with the lapp first 3 digits is first delivered to the lapp securities and exchange commission kernel where it is sorted according to the last 2 digits and distributed to local anesthetic mail offices. The securities and exchange commission centers are not open to the populace and normally do most sorting nightlong. As you can see from the map of the first base 3 digits of travel rapidly codes, the digits after the first are besides by and large assigned from east to west. In the function, 0 is closer to white and 9 is much more graphic. It ‘s easy to follow the gradient across each of the zones even though there are a few exceptions ( such as the southwest gratuity of Georgia which uses 39XXX like cardinal Mississippi ) .
The ZIP+4 code is not required, but it aids the station office in extra sort of mail. A ZIP+4 code may correspond to a city block, group of apartments, or an individual high-volume liquidator. It is besides common for each PO Box number to correspond to a unique ZIP+4 code. sometimes, respective PO Box numbers are grouped into the same ZIP+4 code by using the final several digits of the PO Box number. This method is n’t a universal rule though sol the ZIP+4 must still be looked up for each PO Box .
Places in the US so Remote, They Don’t Have a ZIP
As you can see from the map, not everywhere in the US is assigned a ZIP code. Remote and particularly rural areas of the nation do not have adequate deliverable addresses to create a chain mail road. Without mail delivery, a ZIP is not needed. If you are looking to get off the grid, these areas are some of the most distant places within the nation .
USA ZIP Code Boundaries
Despite the fact that ZIP codes seem to be geographic in nature, that was n’t their intended purpose. They are intended to group mail to allow the USPS to deliver mail more efficiently. Some ZIP codes will span multiple states in club to make mail route and delivery more efficient. In most cases, addresses in close proximity to each other are grouped in the like ZIP code which gives the appearance that ZIP codes are defined by a clear geographic limit. however, some ZIP codes have nothing to do with geogaphic areas. For case, a individual ZIP code is used for all US Navy mail. When ZIP codes appear to be geographically grouped, a clear form can not always be drawn around the ZIP code because ZIP codes are only assigned to a point of delivery and not the spaces between delivery points. In areas without a regular postal route or no mail delivery, ZIP codes may not be defined or have indecipherable boundaries.
US ZIP Code Map
No official ZIP code map according to actual USPS data exists. The main issue is discussed above : there plainly is n’t always a clean geographic limit for a ZIP code. The Census Bureau and many other commercial services will try to interpolate the data to create polygons ( shapes using uncoiled lines ) to represent the approximate area covered by a ZIP code, but none of these maps are official or wholly accurate .
On this web site, all ZIP code maps use the ZIP Code Tabulation Areas ( ZCTAs ) as specified by the United States Census Bureau in 2010 ( or newer ) and discussed below. They provide a very near approximation of the area covered by a ZIP code. You can well notice some of the limit issues when viewing our maps. very rural areas are n’t labeled as belong to a ZIP code ( such as a lot of Nevada and Utah ) where there are few, if any, addresses to deliver mail. If the address is on the same street as a ZIP code boundary on the map, be sure to search for the full moon street address to determine the ZIP code rather of relying on the map .
ZIP Code Tabulation Areas (ZCTAs)
ZIP code tabulation areas were developed by the United States Census Bureau. Their determination is to convey statistical data about regions that are familiar to most citizens. however, ZCTAs are not precisely the lapp as ZIP codes. As discussed above, it is unmanageable to precisely define a geographic area covered by a ZIP code. ZCTAs were developed to account for some of the difficulties in assigning an area to a ZIP code and to precisely define a geographic area. besides, ZCTAs are not updated angstrom frequently as ZIP codes. In general, they are updated once every 10 years for the Census .
The Census assigns an area to a ZCTA according to census blocks ( the smallest geographic unit of measurement used by the census ). Imagine a city block that makes up a typical census parry as pictured to the mighty. It is bounded on all 4 sides by portions of city streets that each have their own name and addresses. The topic is that census blocks about constantly 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 model, one mail aircraft carrier may deliver to 3 sides of the block via one ZIP code while another mail carrier wave delivers mail on the other street in a unlike ZIP code. When this happens, the Census Bureau will assign the integral freeze to a single ZCTA ( in this case, 21044 ) because the census block is the area that is precisely measured. If you are getting very precise ( normally a matter of meters, not miles ), census jam boundaries near the border of a ZIP code about always split ZIP codes .
The statistics provided by the Census Bureau can give penetration into the demographics within the ZIP code. For exemplify, see our ZIP code rankings .
Matching ZIP Codes with States, Counties, and Cities
Remember that ZIP codes were made to make mail rescue easier. They were n’t made to correspond to existing boundaries such as cities, counties, or even states. If it is more effective for a chain mail carrier to drive across a state line to deliver mail, the ZIP code ” limit ” will cross the state lines. ZIP codes do n’t normally cross submit lines, but some do ( 65733, 71749, and 73949 are estimable examples ). The dispatch list of ZIP codes that cross state lines is available as separate of our US ZIP code number.
Read more: Doctor Bosconovitch
It gets even more complicate when trying to assign a ZIP code to a specific county ( american samoa much as 25 % cross county lines ), congressional zone, metro area, meter zone, area code, etc. The edges of the boundaries normally overlap. For the purposes of our complimentary zip up code database by county downloads, we will normally 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 reasonably more complicated. united states postal service does not constantly use the city in which the ZIP code is located. The assignment of cities to ZIP codes is more cosmopolitan. The city is normally the list of the main post function. For case, about all ZIP codes in St. Louis County in Missouri have a city of Saint Louis when they may be more accurately described as the list of a smaller city where they are located .
Click hera to learn more about matching ZIPs to cities and counties