You can add it on a simple contact form address field,shopping cart billing and shipping address fields, search bar , location fields etc.
Google Autocomplete Address extension allows you to add autocomplete address functionality on any textbox in a form.
This extension is very easy to set up. Just save textbox id in extension, thats it and the google autocomplete address functionality appears on that textbox.
This extension easily integrates with famous joomla extensions like Virtuemart, Breezing Forms, JEvents, JU Form etc.
No coding or Technical Skills required. Just install the plugin, change the admin settings and you get an autocomplete address box anywhere you want.