The product demo on
our website limits the
radius to 25 miles and
the results to 25 results.
The actual API does not
have these limitations.

Need to add a radius search by ZIP Code to your website or software? The Distance & Radius APIs from ZIP Code Download are the preferred solution for thousands of companies throughout the world.

Our API uses the "Greater Circle" or "As the Crow Flies" method to calculate the distance between ZIP Codes and can easily be employed on any website. See how it works >>

Full documentation and code samples are included.

NOTE: This product is a Distance & Radius API used by programmers that is implemented as part of a website or software product. It is not a stand-alone software application and does not include a User's Interface. ZIP Code Download has ZIP Code Software available for customers without the programming knowledge necessary to use the API.

Which version should I choose?

In their simplest form the Assistants (both Distance & Radius) are simply trig formulas. Depending on what software environment you're using, the formulas have different packaging.

Language	Version	What's Included	Sample Code
ASP	Base Package	DLL (must be installed on server)	sample code
	Source Code	Text ASP script that performs distance/radius calculations
PHP	Source Code	Text PHP class/include files	sample code
Java	Base Package	Compiled Java class file	sample code
	Source Code	Text Java source code
C# / VB.NET	Base Package	.NET assemblies (DLLs)	sample code sample code
	Source Code	C# source code that can be placed in your code
Perl	Source Code	Text class files	sample code
Visual Basic	Base Package	Compiled COM DLL	sample code
	Source Code	Text Visual Basic source code
C++	Base Package	COM object to reference in code	sample code
	Source Code	".h" header files & ".cpp" class files
MS SQL Server 2000+	SQL Server	Scripts which create several user-defined functions on the database server & store procedures.	sample code