Zip Codes and Radius

This time I actually searched TASK and looked for any existing way to identify all constituents that live outside of a 70 mile radius of Houston.  Unfortunately, nothing came up.

Would it be easier to identify all zip codes within a 70 mile radius and use a NOT IN (SELECT...) sort of thing, considering that there are a LOT less of those?  Even so, how in the world would I do that?  Surely, this has been addressed before...

I would appreciate any advice on the subject, Tessiturians.

Trivia Reward: Charles Manson once auditioned [unsuccessfully] for The Monkees.

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