Participating providers are subject to change without notice and are added and deleted periodically. As a result, no warranty is made regarding participation of all listed providers at time of viewing. The distances are calculated using the longitude and latitude of the center of each zip code. Zip codes that include a large area may provide slightly errant results within a few miles. The program calculates distance in a straight line, it does not take into account natural barriers such as mountains, rivers and oceans.

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