#Postal 4 block c code zip#
Also, ZCTAs are not updated as frequently as ZIP codes.
#Postal 4 block c code code#
ZCTAs were developed to account for some of the difficulties in assigning an area toĪ ZIP code and to precisely define a geographic area. As discussed above, it isĭifficult to precisely define a geographic area covered by a ZIP code. However, ZCTAs are not exactly the same as ZIP codes. Their purpose is to convey statistical data about regions that are familiar to ZIP code tabulation areas were developed by the United States Census Bureau.
#Postal 4 block c code full#
If the address is on the same street as a ZIP code boundary on the map, be sure to search for the full streetĪddress to determine the ZIP code instead of relying on the map. Very rural areas aren't labeled as belonging to a ZIP code (such as much of Nevada and Utah) where there areįew, if any, addresses to deliver mail. You can easily notice some of the boundary issues when viewing our maps. They provide a very close approximation of the area covered by a ZIP code.
On this 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. Will try to interpolate the data to create polygons (shapes using straight lines) to represent the approximate area coveredīy a ZIP code, but none of these maps are official or entirely accurate. The Census Bureau and many other commercial services The main issue is discussed above: there simply isn't alwaysĪ clear geographic boundary for a ZIP code. No official ZIP code map according to actual USPS data exists. In areas without a regular postal route or no mail delivery, ZIP codes may not be defined or have unclear boundaries. When ZIP codes appear to be geographically grouped, a clear shape cannot always be drawn around the ZIP code because ZIP codes are only assigned to a point of deliveryĭelivery points. For instance, a single ZIP code is used for all US Navy mail. However, some ZIP codes have nothing to do with geogaphic areas. In most cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined byĪ clear geographic boundary. Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. They are intended to group mail to allow the USPS to deliver mail This method isn't a universal rule though so the ZIP+4 must still be looked up for each POĭespite the fact that ZIP codes seem to be geographic in nature, that wasn't their intended purpose. The same ZIP+4 code by using the last several digits of the PO Box number. Sometimes, several PO Box numbers are grouped into It is also common for each PO Box number to correspond to a unique ZIP+4 code. A ZIP+4 code may correspond to a city block, group of apartments, orĪn individual high-volume receiver. The ZIP+4 code is not required, but it aids the post office in additional sorting of mail. It's easy to follow the gradient across each of the zonesĮven though there are a few exceptions (such as the southwest tip of Georgia which uses 39XXX like central Mississippi). In the map, 0 is closer to white and 9 is much more vivid. Map of the first 3 digits of zip codes, the digits after the first are also The sec centers are not open to the public and usually do most sorting overnight. All mail with the same first 3 digits is first delivered to the same sec center where it is sorted according to the last 2 digits and distributed to
The first 3 digits of a ZIP code determine the central mail processing facility, also called sectional center facility or "sec center", that is used to process and They are assigned in order from the north east to the west coast. The map of the first digit of zip codes above shows The first digit of a USA ZIP code generally represents a group of U.S. 22313 for the PO Boxes of Alexandria, VA) Unique/single high volume address (ex.Sorting packages and calculating the time and cost of shipping a package (the shipping rate). Though ZIP codes were originally developedįor USPS, many other shipping companies such as United Parcel Service (UPS), Federal Express (FedEx), DHL, and others make use of ZIP codes for The additional 4 digits help USPS more precisely group mail for delivery. The basic 5-digit format was first introduced in 1963 and laterĮxtended to add an additional 4 digits after a dash to form a The term ZIP stands for Zone Improvement Plan. Some still refer to ZIP codes as US postal codes. ZIP codes near me are shown on the map above. 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.
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