Disable Autofill / Autocomplete in Gravity Forms

My clients use the same form repeatedly. Among other data items, it asks for city, state and zip. The form is autofilling the incorrect state on occasion. I have used Gravity Forms Disable Autofill Add-On by Andrew Gunn successfully in the recent past, but it hasn't been updated in over two years and it doesn't seem to be working any longer. I am looking for a new solution.

As a preferred alternative, I want the client to enter a US zip code and have the city, state and a county fields auto-populate. I have tested plugins that will do this (via Google API), but most require that you start entering the street address. I do not want street address at all, just city, state, county and zip and the zip code seems the obvious initial input.