This tool can also find the postal code of many other countries. Postal codes vary from one country to another but they are usually a group of numbers between 3 and 10 digits long. In some countries such as the United Kingdom and Canada, postal code are comprised of number and letters.
Toggle navigation Map Developers. Home Maps What county am I in? Where am I? What is my zipcode? What is my address? They are intended to group mail to allow the USPS to deliver mail more efficiently.
Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. 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 by a clear geographic boundary.
However, some ZIP codes have nothing to do with geogaphic areas. 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 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 unclear boundaries.
The main issue is discussed above: there simply isn't always a clear geographic boundary for a ZIP code. The Census Bureau and many other commercial services will try to interpolate the data to create polygons shapes using straight lines to represent the approximate area covered by a ZIP code, but none of these maps are official or entirely accurate.
They provide a very close approximation of the area covered by a ZIP code. You can easily notice some of the boundary issues when viewing our maps. Very rural areas aren't labeled as belonging to a ZIP code such as much 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 street address to determine the ZIP code instead of relying on the map. Their purpose is to convey statistical data about regions that are familiar to most citizens. As discussed above, it is difficult 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.
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 used by the census. Imagine a city block that makes up a typical census block as pictured to the right. This happens in highly populated areas but also suburban and rural areas. In total, there are at least cities across 37 states that cross county lines. Fortunately, crossing these lines doesn't result in a totaled Ferrari.
People often imagine that ZIP Codes are regions or boxes with defined boundaries. In reality, ZIP Codes are lines. More specifically, ZIP Codes are a collection of postal delivery routes that tie to a post office. They may look like this:. Postal delivery routes are determined by optimal efficiency. County lines are rarely considered when determining where USPS mail trucks go.
If you enter into our address validation demo, you will find that the ZIP Code spans five counties. Even still, you may still need to know all the counties in a particular city or ZIP Code. Here is how:. They are both five characters long. They are both composed of numbers exclusively. But, that is where the similarities end. Numbers are assigned alphabetically in ascending order. The first two digits in the five-digit county FIPS Code represent the state in which the county is located.
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