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- Useful for distance and radius ZIP Code searches
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- Updated Monthly with official USPS data
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- We are a licensed distributor of the U.S. Postal Service ZIP code data
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No, they don't. ZIP Codes were never meant to identify a geographic region, they're simply routes taken to deliver mail. We use the boundaries created by the mail routes to create a geographic region and assign the ZIP Code lat/long coordinates.
There are three types of cities in our databases. They are indicated by the CityType column. • D - Default - This is the "preferred" name - by the USPS - for a city. Each ZIP Code has one - and only one - "default" name. In most cases, this is what people who live in that area call the city as well. • A - Acceptable - This name can be used for mailing purposes. Often times alternative names are large neighborhoods or sections of the city/town. In some cases a ZIP Code may have several "acceptable" names which is used to group towns under one ZIP Code. • N - Not Acceptable - A "not acceptable" name is, in many cases, a nickname that residents give that location. According to the USPS, you should NOT send mail to that ZIP Code using the "not acceptable" name when mailing. The USPS includes the Not Acceptable city names to assist with data validation. If you do not want these names to display in your application, filter all the "N" CityTypes from the database. If you want to display only one city for each ZIP Code, display only the "D" CityType.
In many cases, a ZIP Code can have multiple "names", meaning cities, towns, or subdivisions, in its boundaries. Alternate names show additional names that are a part of that ZIP Code or postal code - but are not necessarily the "primary" or "default" name.
The problem you're seeing with the "4-digit or 3-digit ZIP Code" isn't really a problem with our data at all, in fact, it has to do with Microsoft Excel and other programs that read the Tab or CSV file. They're trying to read the first column as an integer. When they see zeros, they get rid of them. The ZIP Code you see 501 should be 00501. You may need to use a "text-import" feature in order to get the columns to render properly as "text" and not numbers.
The USA 5-digit Commercial Edition has the primary county for each ZIP Code and the ZIP+4 Premium Edition has the County FIPS Code for each ZIP+4. We also offer a Multi-County product that indicates whether or not ZIP Codes cross into multiple counties.
Both the USA 5-digit and Canada 6-digit Premium & Commercial Editions, along with our USA & Canada Bundled database, have lat/long info. You can view these products on our product page.