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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? What country am I in? What's my Zip Code - Find the zip code of your current location. These codes indicate a specific delivery route , meaning the actual path the mail truck would travel in a single drop-off. Usually this comprises ten to twenty homes or locations. Because ZIP codes plus 4 extra digits are based on delivery routes instead of more permanent boundaries, the last 4 digits of a complete ZIP Code can change often.

Not so for the full 9-digit ZIP Code. For another thing, they can help get you those bulk mailing discounts. Another important benefit to using the last four digits of ZIP Codes is delivery speed.

That's right, your mail can show up faster if you label things right. Bet you're scrambling for those codes now, huh? Get those extra 4 digits. If you want to try it on a single address, you can use our single address verification tool now.

Go ahead and perform some postal address verification. Or you could call us instead if you'd rather talk to a real person. We'd offer a fake person, but we don't have one of those on staff. SmartyStreets is becoming. Arrow Icon Articles. 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.