List of po box only zip codes

Keep in mind, that a ZIP Code can span multiple cities, counties, and even states. Yes, there are some ZIP codes that exist in multiple states. That is because a ZIP code is not a physical boundary but a postal route designed with convenience and efficiency in mind.

If there is a remote mountain road that is only accessible from a small town in Alabama but that road crosses over into Mississippi, the addresses on that road will be serviced by the post office or ZIP Code that is in Alabama. Since there are only Million mailing address in the US, that still leaves some room for growth. I work for one called SmartyStreets. It looks like you are looking at the "City Type" field which is different from the "Classification Code" which is where you would find the fields you are looking for.

Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Where can I find a list of non deliverable zip codes Ask Question. Asked 9 years, 9 months ago. Active 1 year, 7 months ago. Viewed 16k times.

Thanks in advance! Improve this question. Is there another copy of that table somewhere? Add a comment. Active Oldest Votes. The "type" can be any of the following: S - Standard - A "standard" ZIP Code is what most people think of when they talk about ZIP Codes - essentially a town, city, or a division of a city that has mail service.

Improve this answer. 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. It is bounded on all 4 sides by portions of city streets that each have their own name and addresses. The issue is that census blocks almost always 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 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. The USPS keeps track of more information than we normally give them credit for. So the fact that there's more than one kind of ZIP Code should come as no shock but it does anyway.

Here's a quick rundown of why there's more than one kind of ZIP Code. First, there are regular addresses. Addresses that receive mail at that physical location fall into this category. For example, if the Caped Crusader can receive his shipments of new batarangs right at his front door, then Wayne Manor, Mountain Drive, Gotham meets this qualification. The "S" is for "Standard. Then there are addresses that are American by nationality, but not by locality.

Military addresses run the gamut from ships at sea to embassies and bases around the world. Since ships are not stationary like normal addresses, and since military installations are often nestled amongst foreign soil, they get a special "M" for "Military" classification.

That identifies them as being reachable by the USPS, but requiring methods and delivery systems more akin to international shipping. Here's a funny one: the "U" classification.