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## Zip Code Radius Calculations Using Microsoft Excel

Microsoft Excel “custom functions” can be used to perform many tasks related to address and location-based information, such as entering location data, checking the accuracy of addresses, and calculating driving times and creating directions. Standard functions, also called User-Defined Functions (UDFs), perform complex calculations or operations and are used in cell formulas like standard Excel functions such as SUM or AVERAGE. In this article we will discuss how custom functions can be used to identify zip codes within a defined distance or “radius”.

Zip codes can be very useful for analyzing demographic information, and can help you target customers and plan marketing campaigns. For example, identifying zip codes within a specified radius of new store locations can help you choose the most accessible location for your customers. But instead of drawing a circle on the map, the easiest way is to use a standard function within Excel that can do the job for you.

Let’s say you are evaluating a potential store location in zip 07470 and you want a list of all zips within a 10 mile radius. To use a function called RADIUS, simply enter a formula in a worksheet cell like this: “=RADIUS (ZipCode, RadiusDistance)”. In this case the formula is “= RADIUS (“07470″, 10)”, and the worksheet will show all results within 10 miles of 07470.

A formula can be created to output data as a text string listed in a single cell, or as a list with individual results across multiple cells in a spreadsheet. To return a formula as a list in Excel, simply highlight the list area with your mouse, then hold down the Ctrl and Shift keys and press Enter. The returned data can include calculated distances and sort these by proximity to the target zip. Additional options can be added if the distance is returned in kilometers or kilometers.

A custom function performs a procedure to find all zips that fall within a given radius by searching a local database and performing distance calculations based on latitude and longitude. All these actions take place in the background, so the user works entirely within Excel and only sees the resulting list of zip codes displayed on their worksheet – there is no need to read a new application or enter the list of zip codes on a web page.

A major advantage of custom jobs is their ability to process large amounts of data in spreadsheet format. To perform code radius calculations for a list of zip codes in column A, for example, simply enter the appropriate custom formula in cell B1, such as: “=RADIUS (A1, 10)” where “A1” is the worksheet cell. the location of the original zip code. Then copy and paste this formula as needed in column B; This way you can perform radius calculations for literally thousands of zip codes, without the time-consuming manual input required in other systems.

There are other useful custom Excel functions associated with this radius calculation, such as calculating the distance between two given zip codes. A custom function in this example would be something like “=DISTANCE(ZipCode1, ZipCode2)”. The calculated distance may be “as the crow flies” or it may be an estimate of distance or driving time.

The custom radius function is a great example of how Microsoft Excel functions can be used to perform complex operations, all within a simple spreadsheet formula. From calculating driving distance and time between addresses, to identifying zips within a specified radius, custom functions are a very useful way to analyze address and location-based information in Excel.

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