Usps seattle zip codes

They also released the ZIP Code jingle:. As the US population has increased and scattered since , it's been necessary to expand on the system, to make room for everybody and their dog.

That's where the "plus 4" part comes in. We're getting ahead of ourselves, though, so let's start with the basics. If you're mailing a letter from Boston to Seattle, the mail carrier in Massachusetts doesn't really care what the street address of the destination is.

It's what you might call "outside his jurisdiction. A postal worker can only cover so much ground on a given day. And since the USPS has a standard of delivering in rain, sleet or snow, that rules out the possibility of doing the service of delivering in stages some today, some tomorrow. That means that any given post office is only servicing what it can reach in a day. ZIP Codes reflect that. Typically, a ZIP Code is tied to a post office; by that we mean, every one of the latter has one of the former.

You might think of ZIP Codes as a mailing address for a particular post office. Some do handle more than one ZIP Code, but a one-on-one game plan is the norm.

It's very important to note that ZIP Codes aren't "boundaries. They don't follow geographic or administrative boundary lines; they can cross city, county, or even state lines. They follow where the delivery trucks go. Some ZIP Codes are special cases. Among them are "military" ZIP Codes, which include everything from military bases domestic or otherwise to battleships at sea.

Then there are "unique" codes. Businesses and organizations sometimes get their own ZIP Codes, due to the volume of mail they send and receive. These are frequently benefiting from bulk mailing discounts, since the organization usually has a mail department that 1 presorts mail before giving it to the USPS, and 2 distributes mail internally so the USPS doesn't have to.

Using full ZIP Codes ensure the fastest, most accurate mailing possible. Skip all category navigation links. Sign In. Search USPS. Back to Find Locations. Sorry, something went wrong. Please try your search again. Please enter a street address.

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