Talk with a specialist about getting started with PostGrid. Hit enter to search or ESC to close. So, keep reading to know more. The ZIP code in the address must correspond accurately with the city or town in the address. Minimize Postage Costs Suppose you send out direct mail postcards , and 10 of them are returned to you.
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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.
Active Oldest Votes. John Washam John Washam 3, 4 4 gold badges 29 29 silver badges 43 43 bronze badges. E I was able to enter G1Q 3i7 and it did not show a validation error.
Good point. I think if you take d moncada's Canada Regex but add lowercase letters, that would be a good solution.. Thank you, Paul. I have updated my answer with your changes. I am not personally very familiar with Canadian postal codes, so I assumed the author of the blog had it right. Looks like someone in the comments there also pointed out the weakness in the regex, but we've got it right here now in this answer.
The upper and lowercase alpha characters don't match in the second two alpha sections of the regex. Bogdan Mates Bogdan Mates 4 4 silver badges 8 8 bronze badges.
I was just foolish in thinking there would be a way to check using a few rules XD. Add a comment. Active Oldest Votes. Cody Caughlan Cody Caughlan Robert Muil Robert Muil 2, 1 1 gold badge 22 22 silver badges 28 28 bronze badges. Sign up or log in Sign up using Google.
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