State with zip codes

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West Virginia. American Samoa. Marshall Islands. GU1 and GU2 are the postcode districts for Guildford. Woking, a post town in the GU22 postal district, is 6 miles away. These are treated either alphabetically particularly in London, where Chingford is E4 and Walthamstow is E17 or geographically the Outer Hebrides area HS numbers the districts north to south.

As a rule, large post towns have higher-numbered districts in the outlying areas. However, the post towns within a postal area can be numbered for various reasons. Except for the town named after the postal area, this is always 1. The postcode alone cannot reliably infer a postcode district's centrality within a postcode area. Check the postcode. Postcodes are used for many purposes besides mail sorting, such as calculating insurance premiums, routing software, and census enumeration.

In addition to storing postcode boundaries, the Postcode Address File database also stores full address data for approximately 29 million addresses delivery points. In , London was divided into broad numbered subdivisions, which were expanded to other cities in However, this is against Royal Mail guidelines, which require a complete address. Formatting Postcodes are alphanumeric and range from 6 to 8 characters including a space.

The outward code and the inward code are separated by a single space in each postcode. The postcode area and district make up the outward code. The inward code is the postcode sector and unit. Postcodes are used to sort letters manually using labeled frames or increasingly with letter-coding systems with machine assistance. Automated sorting that reads printed postcodes is best suited for mail with a consistent layout and addressing format.

A long string of "faced" letters is presented to a keyboard operator at a coding desk who types the postcodes in coloured phosphor dots onto the envelopes. The associated machine uses these dots to direct letter bundles into the appropriate delivery office-specific bags. The bundles can be further sorted using the dots of the inward sorting code, ensuring that each delivery round receives only its own letters. This feature is only used in large sorting offices that handle high volumes of mail.

In the absence of postcodes, the operator reads the post town's name and inserts a code sufficient for outward sorting to the post town. In the map, 0 is closer to white and 9 is much more vivid. It's easy to follow the gradient across each of the zones even though there are a few exceptions such as the southwest tip of Georgia which uses 39XXX like central Mississippi. Despite the fact that ZIP codes seem to be geographic in nature, that wasn't their intended purpose.

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.