How to only include the zip code for the shipping estimator?

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Hi all!

I followed the instructions here to include a shipping calculator. It works great, but I would like it to only require the zip code. For example, if I enter a zip code in Colorado, but don't change the state, the default (Alabama) is listed and I receive an error that the zip code entered is not found in that state. It feels redundant to have to include both the state and the zip code and don't want extra steps for my customers. It should know what state it is in based on the zip code. Suggestions on how I can change this so the state is not required or automatically changes based on the zip code? Thanks in advance. I really appreciate the help!