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There is no quick solution for this because the plugin uses visitor's location first and then applies the default one (San Francisco, CA)

you can use your location by replacing the default...

The plugin doesn't support the default city, only detected user's city on the page

Please, refer to my post:

You need to save the Country field without a country and then you can select a default country

it was a typo, I meant Country field instead of Zip Code field

Hello,

It will require a customization but I don't think it's a good idea

you can set a single country via Basic Settings > Search by Distance > Listing Fields Mapping > Country field > leave...