A house with two zip codes

I have a similar problem with my home in rural NY. Utility companies consider me in a different town+ZIP than my actual mailing town+ZIP.

So I live in Location A, my utility address is Location B, and I'm served by Location C's fire services.

My house similarly has two post codes. Only one is official, though.

Google Maps lists the incorrect value, so it’s easy to see who simply googled the street address, eg the real estate agent who listed it.

Both post codes are fine for delivery since they’re “close enough”.